diff --git a/rust/ql/consistency-queries/SsaConsistency.ql b/rust/ql/consistency-queries/SsaConsistency.ql
new file mode 100644
index 000000000000..0764842dac37
--- /dev/null
+++ b/rust/ql/consistency-queries/SsaConsistency.ql
@@ -0,0 +1,19 @@
+import codeql.rust.dataflow.Ssa
+import codeql.rust.dataflow.internal.SsaImpl
+import Consistency
+
+class MyRelevantDefinition extends RelevantDefinition, Ssa::Definition {
+  override predicate hasLocationInfo(
+    string filepath, int startline, int startcolumn, int endline, int endcolumn
+  ) {
+    this.getLocation().hasLocationInfo(filepath, startline, startcolumn, endline, endcolumn)
+  }
+}
+
+class MyRelevantDefinitionExt extends RelevantDefinitionExt, DefinitionExt {
+  override predicate hasLocationInfo(
+    string filepath, int startline, int startcolumn, int endline, int endcolumn
+  ) {
+    this.getLocation().hasLocationInfo(filepath, startline, startcolumn, endline, endcolumn)
+  }
+}
diff --git a/rust/ql/lib/codeql/rust/dataflow/Ssa.qll b/rust/ql/lib/codeql/rust/dataflow/Ssa.qll
new file mode 100644
index 000000000000..d012711466af
--- /dev/null
+++ b/rust/ql/lib/codeql/rust/dataflow/Ssa.qll
@@ -0,0 +1,304 @@
+/**
+ * Provides the module `Ssa` for working with static single assignment (SSA) form.
+ */
+
+/**
+ * Provides classes for working with static single assignment (SSA) form.
+ */
+module Ssa {
+  private import rust
+  private import codeql.rust.controlflow.BasicBlocks
+  private import codeql.rust.controlflow.ControlFlowGraph
+  private import codeql.rust.controlflow.internal.ControlFlowGraphImpl as CfgImpl
+  private import internal.SsaImpl as SsaImpl
+
+  /** A variable amenable to SSA construction. */
+  class Variable = SsaImpl::SsaInput::SourceVariable;
+
+  /** A static single assignment (SSA) definition. */
+  class Definition extends SsaImpl::Definition {
+    /**
+     * Gets the control flow node of this SSA definition, if any. Phi nodes are
+     * examples of SSA definitions without a control flow node, as they are
+     * modeled at index `-1` in the relevant basic block.
+     */
+    final CfgNode getControlFlowNode() {
+      exists(BasicBlock bb, int i | this.definesAt(_, bb, i) | result = bb.getNode(i))
+    }
+
+    /**
+     * Gets a control-flow node that reads the value of this SSA definition.
+     *
+     * Example:
+     *
+     * ```rb
+     * def m b        # defines b_0
+     *   i = 0        # defines i_0
+     *   puts i       # reads i_0
+     *   puts i + 1   # reads i_0
+     *   if b         # reads b_0
+     *     i = 1      # defines i_1
+     *     puts i     # reads i_1
+     *     puts i + 1 # reads i_1
+     *   else
+     *     i = 2      # defines i_2
+     *     puts i     # reads i_2
+     *     puts i + 1 # reads i_2
+     *   end
+     *                # defines i_3 = phi(i_1, i_2)
+     *   puts i       # reads i3
+     * end
+     * ```
+     */
+    final CfgNode getARead() { result = SsaImpl::getARead(this) }
+
+    /**
+     * Gets a first control-flow node that reads the value of this SSA definition.
+     * That is, a read that can be reached from this definition without passing
+     * through other reads.
+     *
+     * Example:
+     *
+     * ```rb
+     * def m b        # defines b_0
+     *   i = 0        # defines i_0
+     *   puts i       # first read of i_0
+     *   puts i + 1
+     *   if b         # first read of b_0
+     *     i = 1      # defines i_1
+     *     puts i     # first read of i_1
+     *     puts i + 1
+     *   else
+     *     i = 2      # defines i_2
+     *     puts i     # first read of i_2
+     *     puts i + 1
+     *   end
+     *                # defines i_3 = phi(i_1, i_2)
+     *   puts i       # first read of i3
+     * end
+     * ```
+     */
+    final CfgNode getAFirstRead() { SsaImpl::firstRead(this, result) }
+
+    /**
+     * Gets a last control-flow node that reads the value of this SSA definition.
+     * That is, a read that can reach the end of the enclosing CFG scope, or another
+     * SSA definition for the source variable, without passing through any other read.
+     *
+     * Example:
+     *
+     * ```rb
+     * def m b        # defines b_0
+     *   i = 0        # defines i_0
+     *   puts i
+     *   puts i + 1   # last read of i_0
+     *   if b         # last read of b_0
+     *     i = 1      # defines i_1
+     *     puts i
+     *     puts i + 1 # last read of i_1
+     *   else
+     *     i = 2      # defines i_2
+     *     puts i
+     *     puts i + 1 # last read of i_2
+     *   end
+     *                # defines i_3 = phi(i_1, i_2)
+     *   puts i       # last read of i3
+     * end
+     * ```
+     */
+    final CfgNode getALastRead() { SsaImpl::lastRead(this, result) }
+
+    /**
+     * Holds if `read1` and `read2` are adjacent reads of this SSA definition.
+     * That is, `read2` can be reached from `read1` without passing through
+     * another read.
+     *
+     * Example:
+     *
+     * ```rb
+     * def m b
+     *   i = 0        # defines i_0
+     *   puts i       # reads i_0 (read1)
+     *   puts i + 1   # reads i_0 (read2)
+     *   if b
+     *     i = 1      # defines i_1
+     *     puts i     # reads i_1 (read1)
+     *     puts i + 1 # reads i_1 (read2)
+     *   else
+     *     i = 2      # defines i_2
+     *     puts i     # reads i_2 (read1)
+     *     puts i + 1 # reads i_2 (read2)
+     *   end
+     *   puts i
+     * end
+     * ```
+     */
+    final predicate hasAdjacentReads(CfgNode read1, CfgNode read2) {
+      SsaImpl::adjacentReadPair(this, read1, read2)
+    }
+
+    /**
+     * Gets an SSA definition whose value can flow to this one in one step. This
+     * includes inputs to phi nodes and the prior definitions of uncertain writes.
+     */
+    private Definition getAPhiInputOrPriorDefinition() {
+      result = this.(PhiDefinition).getAnInput()
+    }
+
+    /**
+     * Gets a definition that ultimately defines this SSA definition and is
+     * not itself a phi node.
+     *
+     * Example:
+     *
+     * ```rb
+     * def m b
+     *   i = 0        # defines i_0
+     *   puts i
+     *   puts i + 1
+     *   if b
+     *     i = 1      # defines i_1
+     *     puts i
+     *     puts i + 1
+     *   else
+     *     i = 2      # defines i_2
+     *     puts i
+     *     puts i + 1
+     *   end
+     *                # defines i_3 = phi(i_1, i_2); ultimate definitions are i_1 and i_2
+     *   puts i
+     * end
+     * ```
+     */
+    final Definition getAnUltimateDefinition() {
+      result = this.getAPhiInputOrPriorDefinition*() and
+      not result instanceof PhiDefinition
+    }
+
+    override string toString() { result = this.getControlFlowNode().toString() }
+
+    /** Gets the scope of this SSA definition. */
+    CfgScope getScope() { result = this.getBasicBlock().getScope() }
+  }
+
+  /**
+   * An SSA definition that corresponds to a write. For example `x = 10` in
+   *
+   * ```rb
+   * x = 10
+   * puts x
+   * ```
+   */
+  class WriteDefinition extends Definition, SsaImpl::WriteDefinition {
+    private CfgNode write;
+
+    WriteDefinition() {
+      exists(BasicBlock bb, int i, Variable v |
+        this.definesAt(v, bb, i) and
+        SsaImpl::variableWriteActual(bb, i, v, write)
+      )
+    }
+
+    /** Gets the underlying write access. */
+    final CfgNode getWriteAccess() { result = write }
+
+    /**
+     * Holds if this SSA definition assigns `value` to the underlying variable.
+     *
+     * This is either a direct assignment, `x = value`, or an assignment via
+     * simple pattern matching
+     *
+     * ```rb
+     * case value
+     *  in Foo => x then ...
+     *  in y => then ...
+     * end
+     * ```
+     */
+    predicate assigns(CfgNode value) {
+      exists(AssignmentExpr ae, BasicBlock bb, int i |
+        this.definesAt(_, bb, i) and
+        ae.getLhs() = bb.getNode(i).getAstNode() and
+        value.getAstNode() = ae.getRhs()
+      )
+    }
+
+    final override string toString() { result = write.toString() }
+
+    final override Location getLocation() { result = write.getLocation() }
+  }
+
+  /**
+   * A phi node. For example, in
+   *
+   * ```rb
+   * if b
+   *   x = 0
+   * else
+   *   x = 1
+   * end
+   * puts x
+   * ```
+   *
+   * a phi node for `x` is inserted just before the call `puts x`.
+   */
+  class PhiDefinition extends Definition, SsaImpl::PhiDefinition {
+    /**
+     * Gets an input of this phi node.
+     *
+     * Example:
+     *
+     * ```rb
+     * def m b
+     *   i = 0        # defines i_0
+     *   puts i
+     *   puts i + 1
+     *   if b
+     *     i = 1      # defines i_1
+     *     puts i
+     *     puts i + 1
+     *   else
+     *     i = 2      # defines i_2
+     *     puts i
+     *     puts i + 1
+     *   end
+     *                # defines i_3 = phi(i_1, i_2); inputs are i_1 and i_2
+     *   puts i
+     * end
+     * ```
+     */
+    final Definition getAnInput() { this.hasInputFromBlock(result, _) }
+
+    /** Holds if `inp` is an input to this phi node along the edge originating in `bb`. */
+    predicate hasInputFromBlock(Definition inp, BasicBlock bb) {
+      inp = SsaImpl::phiHasInputFromBlock(this, bb)
+    }
+
+    private string getSplitString() {
+      result = this.getBasicBlock().getFirstNode().(CfgImpl::AstCfgNode).getSplitsString()
+    }
+
+    override string toString() {
+      exists(string prefix |
+        prefix = "[" + this.getSplitString() + "] "
+        or
+        not exists(this.getSplitString()) and
+        prefix = ""
+      |
+        result = prefix + "phi"
+      )
+    }
+
+    /*
+     * The location of a phi node is the same as the location of the first node
+     * in the basic block in which it is defined.
+     *
+     * Strictly speaking, the node is *before* the first node, but such a location
+     * does not exist in the source program.
+     */
+
+    final override Location getLocation() {
+      result = this.getBasicBlock().getFirstNode().getLocation()
+    }
+  }
+}
diff --git a/rust/ql/lib/codeql/rust/dataflow/internal/SsaImpl.qll b/rust/ql/lib/codeql/rust/dataflow/internal/SsaImpl.qll
new file mode 100644
index 000000000000..42573f09f28f
--- /dev/null
+++ b/rust/ql/lib/codeql/rust/dataflow/internal/SsaImpl.qll
@@ -0,0 +1,285 @@
+private import rust
+private import codeql.rust.controlflow.BasicBlocks as BasicBlocks
+private import BasicBlocks
+private import codeql.rust.controlflow.ControlFlowGraph as Cfg
+private import Cfg
+private import codeql.rust.controlflow.internal.ControlFlowGraphImpl as ControlFlowGraphImpl
+private import codeql.ssa.Ssa as SsaImplCommon
+
+private Expr withParens(Expr e) {
+  result = e
+  or
+  result.(ParenExpr).getExpr() = withParens(e)
+}
+
+private predicate isUncertainWrite(VariableAccess va) {
+  exists(RefExpr re, Expr arg |
+    va = re.getExpr() and // todo: restrict to `mut`
+    arg = withParens(re)
+  |
+    arg = any(CallExpr ce).getArgList().getAnArg()
+    or
+    exists(MethodCallExpr mce |
+      arg = mce.getArgList().getAnArg() or
+      arg = mce.getReceiver()
+    )
+  )
+  or
+  va = any(CompoundAssignmentExpr cae).getLhs()
+}
+
+module SsaInput implements SsaImplCommon::InputSig<Location> {
+  class BasicBlock = BasicBlocks::BasicBlock;
+
+  class ControlFlowNode = CfgNode;
+
+  BasicBlock getImmediateBasicBlockDominator(BasicBlock bb) { result = bb.getImmediateDominator() }
+
+  BasicBlock getABasicBlockSuccessor(BasicBlock bb) { result = bb.getASuccessor() }
+
+  class ExitBasicBlock = BasicBlocks::ExitBasicBlock;
+
+  class SourceVariable extends Variable {
+    SourceVariable() {
+      not this.isCaptured() and
+      forall(VariableAccess va | va = this.getAnAccess() |
+        va instanceof VariableReadAccess
+        or
+        va instanceof VariableWriteAccess
+        or
+        isUncertainWrite(va)
+      )
+    }
+  }
+
+  /**
+   * Holds if the statement at index `i` of basic block `bb` contains a write to variable `v`.
+   * `certain` is true if the write definitely occurs.
+   */
+  predicate variableWrite(BasicBlock bb, int i, SourceVariable v, boolean certain) {
+    variableWriteActual(bb, i, v, _) and
+    certain = true
+    or
+    exists(VariableAccess va |
+      isUncertainWrite(va) and
+      va = bb.getNode(i).getAstNode() and
+      v = va.getVariable() and
+      certain = false
+    )
+  }
+
+  predicate variableRead(BasicBlock bb, int i, SourceVariable v, boolean certain) {
+    bb.getNode(i).getAstNode() = v.getAnAccess().(VariableReadAccess) and
+    certain = true
+  }
+}
+
+import SsaImplCommon::Make<Location, SsaInput> as Impl
+
+class Definition = Impl::Definition;
+
+class WriteDefinition = Impl::WriteDefinition;
+
+class UncertainWriteDefinition = Impl::UncertainWriteDefinition;
+
+class PhiDefinition = Impl::PhiNode;
+
+module Consistency = Impl::Consistency;
+
+module ExposedForTestingOnly {
+  predicate ssaDefReachesReadExt = Impl::ssaDefReachesReadExt/4;
+
+  predicate phiHasInputFromBlockExt = Impl::phiHasInputFromBlockExt/3;
+}
+
+pragma[noinline]
+private predicate adjacentDefRead(
+  Definition def, BasicBlock bb1, int i1, BasicBlock bb2, int i2, SsaInput::SourceVariable v
+) {
+  Impl::adjacentDefRead(def, bb1, i1, bb2, i2) and
+  v = def.getSourceVariable()
+}
+
+pragma[noinline]
+private predicate adjacentDefReadExt(
+  DefinitionExt def, BasicBlock bb1, int i1, BasicBlock bb2, int i2, SsaInput::SourceVariable v
+) {
+  Impl::adjacentDefReadExt(def, _, bb1, i1, bb2, i2) and
+  v = def.getSourceVariable()
+}
+
+/** Holds if `v` is read at index `i` in basic block `bb`. */
+private predicate variableReadActual(BasicBlock bb, int i, Variable v) {
+  exists(VariableReadAccess read |
+    read.getVariable() = v and
+    read = bb.getNode(i).getAstNode()
+  )
+}
+
+private predicate adjacentDefReachesRead(
+  Definition def, BasicBlock bb1, int i1, BasicBlock bb2, int i2
+) {
+  exists(SsaInput::SourceVariable v | adjacentDefRead(def, bb1, i1, bb2, i2, v) |
+    def.definesAt(v, bb1, i1)
+    or
+    SsaInput::variableRead(bb1, i1, v, true)
+  )
+  or
+  exists(BasicBlock bb3, int i3 |
+    adjacentDefReachesRead(def, bb1, i1, bb3, i3) and
+    SsaInput::variableRead(bb3, i3, _, false) and
+    Impl::adjacentDefRead(def, bb3, i3, bb2, i2)
+  )
+}
+
+private predicate adjacentDefReachesReadExt(
+  DefinitionExt def, BasicBlock bb1, int i1, BasicBlock bb2, int i2
+) {
+  exists(SsaInput::SourceVariable v | adjacentDefReadExt(def, bb1, i1, bb2, i2, v) |
+    def.definesAt(v, bb1, i1, _)
+    or
+    SsaInput::variableRead(bb1, i1, v, true)
+  )
+  or
+  exists(BasicBlock bb3, int i3 |
+    adjacentDefReachesReadExt(def, bb1, i1, bb3, i3) and
+    SsaInput::variableRead(bb3, i3, _, false) and
+    Impl::adjacentDefReadExt(def, _, bb3, i3, bb2, i2)
+  )
+}
+
+/** Same as `adjacentDefRead`, but skips uncertain reads. */
+pragma[nomagic]
+private predicate adjacentDefSkipUncertainReads(
+  Definition def, BasicBlock bb1, int i1, BasicBlock bb2, int i2
+) {
+  adjacentDefReachesRead(def, bb1, i1, bb2, i2) and
+  SsaInput::variableRead(bb2, i2, _, true)
+}
+
+private predicate adjacentDefReachesUncertainReadExt(
+  DefinitionExt def, BasicBlock bb1, int i1, BasicBlock bb2, int i2
+) {
+  adjacentDefReachesReadExt(def, bb1, i1, bb2, i2) and
+  SsaInput::variableRead(bb2, i2, _, false)
+}
+
+/** Same as `lastRefRedef`, but skips uncertain reads. */
+pragma[nomagic]
+private predicate lastRefSkipUncertainReadsExt(DefinitionExt def, BasicBlock bb, int i) {
+  Impl::lastRef(def, bb, i) and
+  not SsaInput::variableRead(bb, i, def.getSourceVariable(), false)
+  or
+  exists(BasicBlock bb0, int i0 |
+    Impl::lastRef(def, bb0, i0) and
+    adjacentDefReachesUncertainReadExt(def, bb, i, bb0, i0)
+  )
+}
+
+cached
+private module Cached {
+  /**
+   * Holds if `v` is written at index `i` in basic block `bb`, and the corresponding
+   * AST write access is `write`.
+   */
+  cached
+  predicate variableWriteActual(BasicBlock bb, int i, Variable v, CfgNode write) {
+    bb.getNode(i) = write and
+    (
+      write.getAstNode() = v.getPat()
+      or
+      write.getAstNode().(VariableWriteAccess).getVariable() = v
+    )
+  }
+
+  cached
+  CfgNode getARead(Definition def) {
+    exists(Variable v, BasicBlock bb, int i |
+      Impl::ssaDefReachesRead(v, def, bb, i) and
+      variableReadActual(bb, i, v) and
+      result = bb.getNode(i)
+    )
+  }
+
+  cached
+  Definition phiHasInputFromBlock(PhiDefinition phi, BasicBlock bb) {
+    Impl::phiHasInputFromBlock(phi, result, bb)
+  }
+
+  /**
+   * Holds if the value defined at SSA definition `def` can reach a read at `read`,
+   * without passing through any other non-pseudo read.
+   */
+  cached
+  predicate firstRead(Definition def, CfgNode read) {
+    exists(BasicBlock bb1, int i1, BasicBlock bb2, int i2 |
+      def.definesAt(_, bb1, i1) and
+      adjacentDefSkipUncertainReads(def, bb1, i1, bb2, i2) and
+      read = bb2.getNode(i2)
+    )
+  }
+
+  /**
+   * Holds if the read at `read2` is a read of the same SSA definition `def`
+   * as the read at `read1`, and `read2` can be reached from `read1` without
+   * passing through another non-pseudo read.
+   */
+  cached
+  predicate adjacentReadPair(Definition def, CfgNode read1, CfgNode read2) {
+    exists(BasicBlock bb1, int i1, BasicBlock bb2, int i2 |
+      read1 = bb1.getNode(i1) and
+      variableReadActual(bb1, i1, _) and
+      adjacentDefSkipUncertainReads(def, bb1, i1, bb2, i2) and
+      read2 = bb2.getNode(i2)
+    )
+  }
+
+  /**
+   * Holds if the read of `def` at `read` may be a last read. That is, `read`
+   * can either reach another definition of the underlying source variable or
+   * the end of the CFG scope, without passing through another non-pseudo read.
+   */
+  cached
+  predicate lastRead(Definition def, CfgNode read) {
+    exists(BasicBlock bb, int i |
+      lastRefSkipUncertainReadsExt(def, bb, i) and
+      variableReadActual(bb, i, _) and
+      read = bb.getNode(i)
+    )
+  }
+
+  cached
+  Definition uncertainWriteDefinitionInput(UncertainWriteDefinition def) {
+    Impl::uncertainWriteDefinitionInput(def, result)
+  }
+}
+
+import Cached
+private import codeql.rust.dataflow.Ssa
+
+/**
+ * An extended static single assignment (SSA) definition.
+ *
+ * This is either a normal SSA definition (`Definition`) or a
+ * phi-read node (`PhiReadNode`).
+ *
+ * Only intended for internal use.
+ */
+class DefinitionExt extends Impl::DefinitionExt {
+  CfgNode getARead() { result = getARead(this) }
+
+  override string toString() { result = this.(Ssa::Definition).toString() }
+
+  override Location getLocation() { result = this.(Ssa::Definition).getLocation() }
+}
+
+/**
+ * A phi-read node.
+ *
+ * Only intended for internal use.
+ */
+class PhiReadNode extends DefinitionExt, Impl::PhiReadNode {
+  override string toString() { result = "SSA phi read(" + this.getSourceVariable() + ")" }
+
+  override Location getLocation() { result = Impl::PhiReadNode.super.getLocation() }
+}
diff --git a/rust/ql/test/library-tests/variables/Cfg.expected b/rust/ql/test/library-tests/variables/Cfg.expected
index 771d68b602d2..1acf4e7ff37f 100644
--- a/rust/ql/test/library-tests/variables/Cfg.expected
+++ b/rust/ql/test/library-tests/variables/Cfg.expected
@@ -779,96 +779,159 @@ edges
 | variables.rs:372:5:372:16 | CallExpr | variables.rs:365:14:373:1 | BlockExpr |  |
 | variables.rs:372:5:372:17 | ExprStmt | variables.rs:372:5:372:13 | PathExpr |  |
 | variables.rs:372:15:372:15 | x | variables.rs:372:5:372:16 | CallExpr |  |
-| variables.rs:375:1:403:1 | enter main | variables.rs:376:5:376:25 | ExprStmt |  |
-| variables.rs:375:1:403:1 | exit main (normal) | variables.rs:375:1:403:1 | exit main |  |
-| variables.rs:375:11:403:1 | BlockExpr | variables.rs:375:1:403:1 | exit main (normal) |  |
-| variables.rs:376:5:376:22 | PathExpr | variables.rs:376:5:376:24 | CallExpr |  |
-| variables.rs:376:5:376:24 | CallExpr | variables.rs:377:5:377:23 | ExprStmt |  |
-| variables.rs:376:5:376:25 | ExprStmt | variables.rs:376:5:376:22 | PathExpr |  |
-| variables.rs:377:5:377:20 | PathExpr | variables.rs:377:5:377:22 | CallExpr |  |
-| variables.rs:377:5:377:22 | CallExpr | variables.rs:378:5:378:23 | ExprStmt |  |
-| variables.rs:377:5:377:23 | ExprStmt | variables.rs:377:5:377:20 | PathExpr |  |
-| variables.rs:378:5:378:20 | PathExpr | variables.rs:378:5:378:22 | CallExpr |  |
-| variables.rs:378:5:378:22 | CallExpr | variables.rs:379:5:379:23 | ExprStmt |  |
-| variables.rs:378:5:378:23 | ExprStmt | variables.rs:378:5:378:20 | PathExpr |  |
-| variables.rs:379:5:379:20 | PathExpr | variables.rs:379:5:379:22 | CallExpr |  |
-| variables.rs:379:5:379:22 | CallExpr | variables.rs:380:5:380:19 | ExprStmt |  |
-| variables.rs:379:5:379:23 | ExprStmt | variables.rs:379:5:379:20 | PathExpr |  |
-| variables.rs:380:5:380:16 | PathExpr | variables.rs:380:5:380:18 | CallExpr |  |
-| variables.rs:380:5:380:18 | CallExpr | variables.rs:381:5:381:19 | ExprStmt |  |
-| variables.rs:380:5:380:19 | ExprStmt | variables.rs:380:5:380:16 | PathExpr |  |
-| variables.rs:381:5:381:16 | PathExpr | variables.rs:381:5:381:18 | CallExpr |  |
-| variables.rs:381:5:381:18 | CallExpr | variables.rs:382:5:382:19 | ExprStmt |  |
-| variables.rs:381:5:381:19 | ExprStmt | variables.rs:381:5:381:16 | PathExpr |  |
-| variables.rs:382:5:382:16 | PathExpr | variables.rs:382:5:382:18 | CallExpr |  |
-| variables.rs:382:5:382:18 | CallExpr | variables.rs:383:5:383:19 | ExprStmt |  |
-| variables.rs:382:5:382:19 | ExprStmt | variables.rs:382:5:382:16 | PathExpr |  |
-| variables.rs:383:5:383:16 | PathExpr | variables.rs:383:5:383:18 | CallExpr |  |
-| variables.rs:383:5:383:18 | CallExpr | variables.rs:384:5:384:21 | ExprStmt |  |
-| variables.rs:383:5:383:19 | ExprStmt | variables.rs:383:5:383:16 | PathExpr |  |
-| variables.rs:384:5:384:18 | PathExpr | variables.rs:384:5:384:20 | CallExpr |  |
-| variables.rs:384:5:384:20 | CallExpr | variables.rs:385:5:385:21 | ExprStmt |  |
-| variables.rs:384:5:384:21 | ExprStmt | variables.rs:384:5:384:18 | PathExpr |  |
-| variables.rs:385:5:385:18 | PathExpr | variables.rs:385:5:385:20 | CallExpr |  |
-| variables.rs:385:5:385:20 | CallExpr | variables.rs:386:5:386:21 | ExprStmt |  |
-| variables.rs:385:5:385:21 | ExprStmt | variables.rs:385:5:385:18 | PathExpr |  |
-| variables.rs:386:5:386:18 | PathExpr | variables.rs:386:5:386:20 | CallExpr |  |
-| variables.rs:386:5:386:20 | CallExpr | variables.rs:387:5:387:21 | ExprStmt |  |
-| variables.rs:386:5:386:21 | ExprStmt | variables.rs:386:5:386:18 | PathExpr |  |
-| variables.rs:387:5:387:18 | PathExpr | variables.rs:387:5:387:20 | CallExpr |  |
-| variables.rs:387:5:387:20 | CallExpr | variables.rs:388:5:388:21 | ExprStmt |  |
-| variables.rs:387:5:387:21 | ExprStmt | variables.rs:387:5:387:18 | PathExpr |  |
-| variables.rs:388:5:388:18 | PathExpr | variables.rs:388:5:388:20 | CallExpr |  |
-| variables.rs:388:5:388:20 | CallExpr | variables.rs:389:5:389:21 | ExprStmt |  |
-| variables.rs:388:5:388:21 | ExprStmt | variables.rs:388:5:388:18 | PathExpr |  |
-| variables.rs:389:5:389:18 | PathExpr | variables.rs:389:5:389:20 | CallExpr |  |
-| variables.rs:389:5:389:20 | CallExpr | variables.rs:390:5:390:21 | ExprStmt |  |
-| variables.rs:389:5:389:21 | ExprStmt | variables.rs:389:5:389:18 | PathExpr |  |
-| variables.rs:390:5:390:18 | PathExpr | variables.rs:390:5:390:20 | CallExpr |  |
-| variables.rs:390:5:390:20 | CallExpr | variables.rs:391:5:391:21 | ExprStmt |  |
-| variables.rs:390:5:390:21 | ExprStmt | variables.rs:390:5:390:18 | PathExpr |  |
-| variables.rs:391:5:391:18 | PathExpr | variables.rs:391:5:391:20 | CallExpr |  |
-| variables.rs:391:5:391:20 | CallExpr | variables.rs:392:5:392:21 | ExprStmt |  |
-| variables.rs:391:5:391:21 | ExprStmt | variables.rs:391:5:391:18 | PathExpr |  |
-| variables.rs:392:5:392:18 | PathExpr | variables.rs:392:5:392:20 | CallExpr |  |
-| variables.rs:392:5:392:20 | CallExpr | variables.rs:393:5:393:36 | ExprStmt |  |
-| variables.rs:392:5:392:21 | ExprStmt | variables.rs:392:5:392:18 | PathExpr |  |
-| variables.rs:393:5:393:18 | PathExpr | variables.rs:393:20:393:22 | "a" |  |
-| variables.rs:393:5:393:35 | CallExpr | variables.rs:394:5:394:37 | ExprStmt |  |
-| variables.rs:393:5:393:36 | ExprStmt | variables.rs:393:5:393:18 | PathExpr |  |
-| variables.rs:393:20:393:22 | "a" | variables.rs:393:26:393:28 | "b" |  |
-| variables.rs:393:25:393:34 | TupleExpr | variables.rs:393:5:393:35 | CallExpr |  |
-| variables.rs:393:26:393:28 | "b" | variables.rs:393:31:393:33 | "c" |  |
-| variables.rs:393:31:393:33 | "c" | variables.rs:393:25:393:34 | TupleExpr |  |
-| variables.rs:394:5:394:18 | PathExpr | variables.rs:394:20:394:31 | PathExpr |  |
-| variables.rs:394:5:394:36 | CallExpr | variables.rs:395:5:395:26 | ExprStmt |  |
-| variables.rs:394:5:394:37 | ExprStmt | variables.rs:394:5:394:18 | PathExpr |  |
-| variables.rs:394:20:394:31 | PathExpr | variables.rs:394:33:394:34 | 45 |  |
-| variables.rs:394:20:394:35 | CallExpr | variables.rs:394:5:394:36 | CallExpr |  |
-| variables.rs:394:33:394:34 | 45 | variables.rs:394:20:394:35 | CallExpr |  |
-| variables.rs:395:5:395:23 | PathExpr | variables.rs:395:5:395:25 | CallExpr |  |
-| variables.rs:395:5:395:25 | CallExpr | variables.rs:396:5:396:23 | ExprStmt |  |
-| variables.rs:395:5:395:26 | ExprStmt | variables.rs:395:5:395:23 | PathExpr |  |
-| variables.rs:396:5:396:20 | PathExpr | variables.rs:396:5:396:22 | CallExpr |  |
-| variables.rs:396:5:396:22 | CallExpr | variables.rs:397:5:397:19 | ExprStmt |  |
-| variables.rs:396:5:396:23 | ExprStmt | variables.rs:396:5:396:20 | PathExpr |  |
-| variables.rs:397:5:397:16 | PathExpr | variables.rs:397:5:397:18 | CallExpr |  |
-| variables.rs:397:5:397:18 | CallExpr | variables.rs:398:5:398:17 | ExprStmt |  |
-| variables.rs:397:5:397:19 | ExprStmt | variables.rs:397:5:397:16 | PathExpr |  |
-| variables.rs:398:5:398:14 | PathExpr | variables.rs:398:5:398:16 | CallExpr |  |
-| variables.rs:398:5:398:16 | CallExpr | variables.rs:399:5:399:13 | ExprStmt |  |
-| variables.rs:398:5:398:17 | ExprStmt | variables.rs:398:5:398:14 | PathExpr |  |
-| variables.rs:399:5:399:10 | PathExpr | variables.rs:399:5:399:12 | CallExpr |  |
-| variables.rs:399:5:399:12 | CallExpr | variables.rs:400:5:400:17 | ExprStmt |  |
-| variables.rs:399:5:399:13 | ExprStmt | variables.rs:399:5:399:10 | PathExpr |  |
-| variables.rs:400:5:400:14 | PathExpr | variables.rs:400:5:400:16 | CallExpr |  |
-| variables.rs:400:5:400:16 | CallExpr | variables.rs:401:5:401:12 | ExprStmt |  |
-| variables.rs:400:5:400:17 | ExprStmt | variables.rs:400:5:400:14 | PathExpr |  |
-| variables.rs:401:5:401:9 | PathExpr | variables.rs:401:5:401:11 | CallExpr |  |
-| variables.rs:401:5:401:11 | CallExpr | variables.rs:402:5:402:14 | ExprStmt |  |
-| variables.rs:401:5:401:12 | ExprStmt | variables.rs:401:5:401:9 | PathExpr |  |
-| variables.rs:402:5:402:11 | PathExpr | variables.rs:402:5:402:13 | CallExpr |  |
-| variables.rs:402:5:402:13 | CallExpr | variables.rs:375:11:403:1 | BlockExpr |  |
-| variables.rs:402:5:402:14 | ExprStmt | variables.rs:402:5:402:11 | PathExpr |  |
+| variables.rs:375:1:383:1 | enter phi | variables.rs:375:8:375:8 | b |  |
+| variables.rs:375:1:383:1 | exit phi (normal) | variables.rs:375:1:383:1 | exit phi |  |
+| variables.rs:375:8:375:8 | b | variables.rs:375:8:375:15 | Param | match |
+| variables.rs:375:8:375:15 | Param | variables.rs:376:5:376:18 | LetStmt |  |
+| variables.rs:375:18:383:1 | BlockExpr | variables.rs:375:1:383:1 | exit phi (normal) |  |
+| variables.rs:376:5:376:18 | LetStmt | variables.rs:376:17:376:17 | 1 |  |
+| variables.rs:376:9:376:13 | x | variables.rs:377:5:381:5 | ExprStmt | match |
+| variables.rs:376:17:376:17 | 1 | variables.rs:376:9:376:13 | x |  |
+| variables.rs:377:5:381:5 | ExprStmt | variables.rs:377:8:377:8 | b |  |
+| variables.rs:377:5:381:5 | IfExpr | variables.rs:382:5:382:17 | ExprStmt |  |
+| variables.rs:377:8:377:8 | b | variables.rs:378:9:378:14 | ExprStmt | true |
+| variables.rs:377:8:377:8 | b | variables.rs:380:9:380:14 | ExprStmt | false |
+| variables.rs:377:10:379:5 | BlockExpr | variables.rs:377:5:381:5 | IfExpr |  |
+| variables.rs:378:9:378:9 | x | variables.rs:378:13:378:13 | 2 |  |
+| variables.rs:378:9:378:13 | ... = ... | variables.rs:377:10:379:5 | BlockExpr |  |
+| variables.rs:378:9:378:14 | ExprStmt | variables.rs:378:9:378:9 | x |  |
+| variables.rs:378:13:378:13 | 2 | variables.rs:378:9:378:13 | ... = ... |  |
+| variables.rs:379:12:381:5 | BlockExpr | variables.rs:377:5:381:5 | IfExpr |  |
+| variables.rs:380:9:380:9 | x | variables.rs:380:13:380:13 | 3 |  |
+| variables.rs:380:9:380:13 | ... = ... | variables.rs:379:12:381:5 | BlockExpr |  |
+| variables.rs:380:9:380:14 | ExprStmt | variables.rs:380:9:380:9 | x |  |
+| variables.rs:380:13:380:13 | 3 | variables.rs:380:9:380:13 | ... = ... |  |
+| variables.rs:382:5:382:13 | PathExpr | variables.rs:382:15:382:15 | x |  |
+| variables.rs:382:5:382:16 | CallExpr | variables.rs:375:18:383:1 | BlockExpr |  |
+| variables.rs:382:5:382:17 | ExprStmt | variables.rs:382:5:382:13 | PathExpr |  |
+| variables.rs:382:15:382:15 | x | variables.rs:382:5:382:16 | CallExpr |  |
+| variables.rs:385:1:398:1 | enter phi_read | variables.rs:385:13:385:14 | b1 |  |
+| variables.rs:385:1:398:1 | exit phi_read (normal) | variables.rs:385:1:398:1 | exit phi_read |  |
+| variables.rs:385:13:385:14 | b1 | variables.rs:385:13:385:21 | Param | match |
+| variables.rs:385:13:385:21 | Param | variables.rs:385:24:385:25 | b2 |  |
+| variables.rs:385:24:385:25 | b2 | variables.rs:385:24:385:32 | Param | match |
+| variables.rs:385:24:385:32 | Param | variables.rs:386:5:386:14 | LetStmt |  |
+| variables.rs:385:35:398:1 | BlockExpr | variables.rs:385:1:398:1 | exit phi_read (normal) |  |
+| variables.rs:386:5:386:14 | LetStmt | variables.rs:386:13:386:13 | 1 |  |
+| variables.rs:386:9:386:9 | x | variables.rs:387:5:391:5 | ExprStmt | match |
+| variables.rs:386:13:386:13 | 1 | variables.rs:386:9:386:9 | x |  |
+| variables.rs:387:5:391:5 | ExprStmt | variables.rs:387:8:387:9 | b1 |  |
+| variables.rs:387:5:391:5 | IfExpr | variables.rs:393:8:393:9 | b2 |  |
+| variables.rs:387:8:387:9 | b1 | variables.rs:388:9:388:21 | ExprStmt | true |
+| variables.rs:387:8:387:9 | b1 | variables.rs:390:9:390:21 | ExprStmt | false |
+| variables.rs:387:11:389:5 | BlockExpr | variables.rs:387:5:391:5 | IfExpr |  |
+| variables.rs:388:9:388:17 | PathExpr | variables.rs:388:19:388:19 | x |  |
+| variables.rs:388:9:388:20 | CallExpr | variables.rs:387:11:389:5 | BlockExpr |  |
+| variables.rs:388:9:388:21 | ExprStmt | variables.rs:388:9:388:17 | PathExpr |  |
+| variables.rs:388:19:388:19 | x | variables.rs:388:9:388:20 | CallExpr |  |
+| variables.rs:389:12:391:5 | BlockExpr | variables.rs:387:5:391:5 | IfExpr |  |
+| variables.rs:390:9:390:17 | PathExpr | variables.rs:390:19:390:19 | x |  |
+| variables.rs:390:9:390:20 | CallExpr | variables.rs:389:12:391:5 | BlockExpr |  |
+| variables.rs:390:9:390:21 | ExprStmt | variables.rs:390:9:390:17 | PathExpr |  |
+| variables.rs:390:19:390:19 | x | variables.rs:390:9:390:20 | CallExpr |  |
+| variables.rs:393:5:397:5 | IfExpr | variables.rs:385:35:398:1 | BlockExpr |  |
+| variables.rs:393:8:393:9 | b2 | variables.rs:394:9:394:21 | ExprStmt | true |
+| variables.rs:393:8:393:9 | b2 | variables.rs:396:9:396:21 | ExprStmt | false |
+| variables.rs:393:11:395:5 | BlockExpr | variables.rs:393:5:397:5 | IfExpr |  |
+| variables.rs:394:9:394:17 | PathExpr | variables.rs:394:19:394:19 | x |  |
+| variables.rs:394:9:394:20 | CallExpr | variables.rs:393:11:395:5 | BlockExpr |  |
+| variables.rs:394:9:394:21 | ExprStmt | variables.rs:394:9:394:17 | PathExpr |  |
+| variables.rs:394:19:394:19 | x | variables.rs:394:9:394:20 | CallExpr |  |
+| variables.rs:395:12:397:5 | BlockExpr | variables.rs:393:5:397:5 | IfExpr |  |
+| variables.rs:396:9:396:17 | PathExpr | variables.rs:396:19:396:19 | x |  |
+| variables.rs:396:9:396:20 | CallExpr | variables.rs:395:12:397:5 | BlockExpr |  |
+| variables.rs:396:9:396:21 | ExprStmt | variables.rs:396:9:396:17 | PathExpr |  |
+| variables.rs:396:19:396:19 | x | variables.rs:396:9:396:20 | CallExpr |  |
+| variables.rs:400:1:428:1 | enter main | variables.rs:401:5:401:25 | ExprStmt |  |
+| variables.rs:400:1:428:1 | exit main (normal) | variables.rs:400:1:428:1 | exit main |  |
+| variables.rs:400:11:428:1 | BlockExpr | variables.rs:400:1:428:1 | exit main (normal) |  |
+| variables.rs:401:5:401:22 | PathExpr | variables.rs:401:5:401:24 | CallExpr |  |
+| variables.rs:401:5:401:24 | CallExpr | variables.rs:402:5:402:23 | ExprStmt |  |
+| variables.rs:401:5:401:25 | ExprStmt | variables.rs:401:5:401:22 | PathExpr |  |
+| variables.rs:402:5:402:20 | PathExpr | variables.rs:402:5:402:22 | CallExpr |  |
+| variables.rs:402:5:402:22 | CallExpr | variables.rs:403:5:403:23 | ExprStmt |  |
+| variables.rs:402:5:402:23 | ExprStmt | variables.rs:402:5:402:20 | PathExpr |  |
+| variables.rs:403:5:403:20 | PathExpr | variables.rs:403:5:403:22 | CallExpr |  |
+| variables.rs:403:5:403:22 | CallExpr | variables.rs:404:5:404:23 | ExprStmt |  |
+| variables.rs:403:5:403:23 | ExprStmt | variables.rs:403:5:403:20 | PathExpr |  |
+| variables.rs:404:5:404:20 | PathExpr | variables.rs:404:5:404:22 | CallExpr |  |
+| variables.rs:404:5:404:22 | CallExpr | variables.rs:405:5:405:19 | ExprStmt |  |
+| variables.rs:404:5:404:23 | ExprStmt | variables.rs:404:5:404:20 | PathExpr |  |
+| variables.rs:405:5:405:16 | PathExpr | variables.rs:405:5:405:18 | CallExpr |  |
+| variables.rs:405:5:405:18 | CallExpr | variables.rs:406:5:406:19 | ExprStmt |  |
+| variables.rs:405:5:405:19 | ExprStmt | variables.rs:405:5:405:16 | PathExpr |  |
+| variables.rs:406:5:406:16 | PathExpr | variables.rs:406:5:406:18 | CallExpr |  |
+| variables.rs:406:5:406:18 | CallExpr | variables.rs:407:5:407:19 | ExprStmt |  |
+| variables.rs:406:5:406:19 | ExprStmt | variables.rs:406:5:406:16 | PathExpr |  |
+| variables.rs:407:5:407:16 | PathExpr | variables.rs:407:5:407:18 | CallExpr |  |
+| variables.rs:407:5:407:18 | CallExpr | variables.rs:408:5:408:19 | ExprStmt |  |
+| variables.rs:407:5:407:19 | ExprStmt | variables.rs:407:5:407:16 | PathExpr |  |
+| variables.rs:408:5:408:16 | PathExpr | variables.rs:408:5:408:18 | CallExpr |  |
+| variables.rs:408:5:408:18 | CallExpr | variables.rs:409:5:409:21 | ExprStmt |  |
+| variables.rs:408:5:408:19 | ExprStmt | variables.rs:408:5:408:16 | PathExpr |  |
+| variables.rs:409:5:409:18 | PathExpr | variables.rs:409:5:409:20 | CallExpr |  |
+| variables.rs:409:5:409:20 | CallExpr | variables.rs:410:5:410:21 | ExprStmt |  |
+| variables.rs:409:5:409:21 | ExprStmt | variables.rs:409:5:409:18 | PathExpr |  |
+| variables.rs:410:5:410:18 | PathExpr | variables.rs:410:5:410:20 | CallExpr |  |
+| variables.rs:410:5:410:20 | CallExpr | variables.rs:411:5:411:21 | ExprStmt |  |
+| variables.rs:410:5:410:21 | ExprStmt | variables.rs:410:5:410:18 | PathExpr |  |
+| variables.rs:411:5:411:18 | PathExpr | variables.rs:411:5:411:20 | CallExpr |  |
+| variables.rs:411:5:411:20 | CallExpr | variables.rs:412:5:412:21 | ExprStmt |  |
+| variables.rs:411:5:411:21 | ExprStmt | variables.rs:411:5:411:18 | PathExpr |  |
+| variables.rs:412:5:412:18 | PathExpr | variables.rs:412:5:412:20 | CallExpr |  |
+| variables.rs:412:5:412:20 | CallExpr | variables.rs:413:5:413:21 | ExprStmt |  |
+| variables.rs:412:5:412:21 | ExprStmt | variables.rs:412:5:412:18 | PathExpr |  |
+| variables.rs:413:5:413:18 | PathExpr | variables.rs:413:5:413:20 | CallExpr |  |
+| variables.rs:413:5:413:20 | CallExpr | variables.rs:414:5:414:21 | ExprStmt |  |
+| variables.rs:413:5:413:21 | ExprStmt | variables.rs:413:5:413:18 | PathExpr |  |
+| variables.rs:414:5:414:18 | PathExpr | variables.rs:414:5:414:20 | CallExpr |  |
+| variables.rs:414:5:414:20 | CallExpr | variables.rs:415:5:415:21 | ExprStmt |  |
+| variables.rs:414:5:414:21 | ExprStmt | variables.rs:414:5:414:18 | PathExpr |  |
+| variables.rs:415:5:415:18 | PathExpr | variables.rs:415:5:415:20 | CallExpr |  |
+| variables.rs:415:5:415:20 | CallExpr | variables.rs:416:5:416:21 | ExprStmt |  |
+| variables.rs:415:5:415:21 | ExprStmt | variables.rs:415:5:415:18 | PathExpr |  |
+| variables.rs:416:5:416:18 | PathExpr | variables.rs:416:5:416:20 | CallExpr |  |
+| variables.rs:416:5:416:20 | CallExpr | variables.rs:417:5:417:21 | ExprStmt |  |
+| variables.rs:416:5:416:21 | ExprStmt | variables.rs:416:5:416:18 | PathExpr |  |
+| variables.rs:417:5:417:18 | PathExpr | variables.rs:417:5:417:20 | CallExpr |  |
+| variables.rs:417:5:417:20 | CallExpr | variables.rs:418:5:418:36 | ExprStmt |  |
+| variables.rs:417:5:417:21 | ExprStmt | variables.rs:417:5:417:18 | PathExpr |  |
+| variables.rs:418:5:418:18 | PathExpr | variables.rs:418:20:418:22 | "a" |  |
+| variables.rs:418:5:418:35 | CallExpr | variables.rs:419:5:419:37 | ExprStmt |  |
+| variables.rs:418:5:418:36 | ExprStmt | variables.rs:418:5:418:18 | PathExpr |  |
+| variables.rs:418:20:418:22 | "a" | variables.rs:418:26:418:28 | "b" |  |
+| variables.rs:418:25:418:34 | TupleExpr | variables.rs:418:5:418:35 | CallExpr |  |
+| variables.rs:418:26:418:28 | "b" | variables.rs:418:31:418:33 | "c" |  |
+| variables.rs:418:31:418:33 | "c" | variables.rs:418:25:418:34 | TupleExpr |  |
+| variables.rs:419:5:419:18 | PathExpr | variables.rs:419:20:419:31 | PathExpr |  |
+| variables.rs:419:5:419:36 | CallExpr | variables.rs:420:5:420:26 | ExprStmt |  |
+| variables.rs:419:5:419:37 | ExprStmt | variables.rs:419:5:419:18 | PathExpr |  |
+| variables.rs:419:20:419:31 | PathExpr | variables.rs:419:33:419:34 | 45 |  |
+| variables.rs:419:20:419:35 | CallExpr | variables.rs:419:5:419:36 | CallExpr |  |
+| variables.rs:419:33:419:34 | 45 | variables.rs:419:20:419:35 | CallExpr |  |
+| variables.rs:420:5:420:23 | PathExpr | variables.rs:420:5:420:25 | CallExpr |  |
+| variables.rs:420:5:420:25 | CallExpr | variables.rs:421:5:421:23 | ExprStmt |  |
+| variables.rs:420:5:420:26 | ExprStmt | variables.rs:420:5:420:23 | PathExpr |  |
+| variables.rs:421:5:421:20 | PathExpr | variables.rs:421:5:421:22 | CallExpr |  |
+| variables.rs:421:5:421:22 | CallExpr | variables.rs:422:5:422:19 | ExprStmt |  |
+| variables.rs:421:5:421:23 | ExprStmt | variables.rs:421:5:421:20 | PathExpr |  |
+| variables.rs:422:5:422:16 | PathExpr | variables.rs:422:5:422:18 | CallExpr |  |
+| variables.rs:422:5:422:18 | CallExpr | variables.rs:423:5:423:17 | ExprStmt |  |
+| variables.rs:422:5:422:19 | ExprStmt | variables.rs:422:5:422:16 | PathExpr |  |
+| variables.rs:423:5:423:14 | PathExpr | variables.rs:423:5:423:16 | CallExpr |  |
+| variables.rs:423:5:423:16 | CallExpr | variables.rs:424:5:424:13 | ExprStmt |  |
+| variables.rs:423:5:423:17 | ExprStmt | variables.rs:423:5:423:14 | PathExpr |  |
+| variables.rs:424:5:424:10 | PathExpr | variables.rs:424:5:424:12 | CallExpr |  |
+| variables.rs:424:5:424:12 | CallExpr | variables.rs:425:5:425:17 | ExprStmt |  |
+| variables.rs:424:5:424:13 | ExprStmt | variables.rs:424:5:424:10 | PathExpr |  |
+| variables.rs:425:5:425:14 | PathExpr | variables.rs:425:5:425:16 | CallExpr |  |
+| variables.rs:425:5:425:16 | CallExpr | variables.rs:426:5:426:12 | ExprStmt |  |
+| variables.rs:425:5:425:17 | ExprStmt | variables.rs:425:5:425:14 | PathExpr |  |
+| variables.rs:426:5:426:9 | PathExpr | variables.rs:426:5:426:11 | CallExpr |  |
+| variables.rs:426:5:426:11 | CallExpr | variables.rs:427:5:427:14 | ExprStmt |  |
+| variables.rs:426:5:426:12 | ExprStmt | variables.rs:426:5:426:9 | PathExpr |  |
+| variables.rs:427:5:427:11 | PathExpr | variables.rs:427:5:427:13 | CallExpr |  |
+| variables.rs:427:5:427:13 | CallExpr | variables.rs:400:11:428:1 | BlockExpr |  |
+| variables.rs:427:5:427:14 | ExprStmt | variables.rs:427:5:427:11 | PathExpr |  |
 breakTarget
 continueTarget
diff --git a/rust/ql/test/library-tests/variables/Ssa.expected b/rust/ql/test/library-tests/variables/Ssa.expected
new file mode 100644
index 000000000000..2457bb634f4e
--- /dev/null
+++ b/rust/ql/test/library-tests/variables/Ssa.expected
@@ -0,0 +1,409 @@
+nonSsaVariable
+| variables.rs:338:13:338:13 | i |
+| variables.rs:358:13:358:13 | x |
+| variables.rs:366:13:366:13 | x |
+definition
+| variables.rs:12:9:12:10 | x1 | variables.rs:12:9:12:10 | x1 |
+| variables.rs:17:9:17:14 | x2 | variables.rs:17:13:17:14 | x2 |
+| variables.rs:19:5:19:6 | x2 | variables.rs:17:13:17:14 | x2 |
+| variables.rs:24:9:24:10 | x3 | variables.rs:24:9:24:10 | x3 |
+| variables.rs:26:9:26:10 | x3 | variables.rs:26:9:26:10 | x3 |
+| variables.rs:32:9:32:10 | x4 | variables.rs:32:9:32:10 | x4 |
+| variables.rs:35:13:35:14 | x4 | variables.rs:35:13:35:14 | x4 |
+| variables.rs:49:13:49:14 | a1 | variables.rs:49:13:49:14 | a1 |
+| variables.rs:50:13:50:14 | b1 | variables.rs:50:13:50:14 | b1 |
+| variables.rs:53:13:53:13 | x | variables.rs:53:13:53:13 | x |
+| variables.rs:54:13:54:13 | y | variables.rs:54:13:54:13 | y |
+| variables.rs:64:9:64:10 | p1 | variables.rs:64:9:64:10 | p1 |
+| variables.rs:66:12:66:13 | a2 | variables.rs:66:12:66:13 | a2 |
+| variables.rs:67:12:67:13 | b2 | variables.rs:67:12:67:13 | b2 |
+| variables.rs:76:17:76:22 | s2 | variables.rs:76:21:76:22 | s2 |
+| variables.rs:83:14:83:15 | x5 | variables.rs:83:14:83:15 | x5 |
+| variables.rs:93:20:93:25 | s2 | variables.rs:93:24:93:25 | s2 |
+| variables.rs:100:9:100:10 | x6 | variables.rs:100:9:100:10 | x6 |
+| variables.rs:101:9:101:10 | y1 | variables.rs:101:9:101:10 | y1 |
+| variables.rs:105:14:105:15 | y1 | variables.rs:105:14:105:15 | y1 |
+| variables.rs:117:9:117:15 | numbers | variables.rs:117:9:117:15 | numbers |
+| variables.rs:121:13:121:17 | first | variables.rs:121:13:121:17 | first |
+| variables.rs:122:13:122:17 | third | variables.rs:122:13:122:17 | third |
+| variables.rs:123:13:123:17 | fifth | variables.rs:123:13:123:17 | fifth |
+| variables.rs:133:13:133:17 | first | variables.rs:133:13:133:17 | first |
+| variables.rs:135:13:135:16 | last | variables.rs:135:13:135:16 | last |
+| variables.rs:144:9:144:10 | p2 | variables.rs:144:9:144:10 | p2 |
+| variables.rs:148:16:148:17 | x7 | variables.rs:148:16:148:17 | x7 |
+| variables.rs:158:9:158:11 | msg | variables.rs:158:9:158:11 | msg |
+| variables.rs:162:17:162:35 | [match(true)] id_variable | variables.rs:162:17:162:27 | id_variable |
+| variables.rs:167:26:167:27 | id | variables.rs:167:26:167:27 | id |
+| variables.rs:178:9:178:14 | either | variables.rs:178:9:178:14 | either |
+| variables.rs:180:9:180:44 | [match(true)] phi | variables.rs:180:9:180:44 | a3 |
+| variables.rs:180:22:180:23 | a3 | variables.rs:180:9:180:44 | a3 |
+| variables.rs:180:42:180:43 | a3 | variables.rs:180:9:180:44 | a3 |
+| variables.rs:192:9:192:10 | tv | variables.rs:192:9:192:10 | tv |
+| variables.rs:194:9:194:81 | [match(true)] phi | variables.rs:194:9:194:81 | a4 |
+| variables.rs:194:28:194:29 | a4 | variables.rs:194:9:194:81 | a4 |
+| variables.rs:194:54:194:55 | a4 | variables.rs:194:9:194:81 | a4 |
+| variables.rs:194:79:194:80 | a4 | variables.rs:194:9:194:81 | a4 |
+| variables.rs:198:9:198:83 | [match(true)] phi | variables.rs:198:9:198:83 | a5 |
+| variables.rs:198:10:198:57 | [match(true)] phi | variables.rs:198:9:198:83 | a5 |
+| variables.rs:198:29:198:30 | a5 | variables.rs:198:9:198:83 | a5 |
+| variables.rs:198:55:198:56 | a5 | variables.rs:198:9:198:83 | a5 |
+| variables.rs:198:81:198:82 | a5 | variables.rs:198:9:198:83 | a5 |
+| variables.rs:202:9:202:83 | [match(true)] phi | variables.rs:202:9:202:83 | a6 |
+| variables.rs:202:28:202:29 | a6 | variables.rs:202:9:202:83 | a6 |
+| variables.rs:202:35:202:82 | [match(true)] phi | variables.rs:202:9:202:83 | a6 |
+| variables.rs:202:55:202:56 | a6 | variables.rs:202:9:202:83 | a6 |
+| variables.rs:202:80:202:81 | a6 | variables.rs:202:9:202:83 | a6 |
+| variables.rs:208:9:208:14 | either | variables.rs:208:9:208:14 | either |
+| variables.rs:210:9:210:44 | [match(true)] phi | variables.rs:210:9:210:44 | a7 |
+| variables.rs:210:22:210:23 | a7 | variables.rs:210:9:210:44 | a7 |
+| variables.rs:210:42:210:43 | a7 | variables.rs:210:9:210:44 | a7 |
+| variables.rs:218:9:218:14 | either | variables.rs:218:9:218:14 | either |
+| variables.rs:222:14:222:51 | [match(true)] phi | variables.rs:222:14:222:51 | a11 |
+| variables.rs:222:27:222:29 | a11 | variables.rs:222:14:222:51 | a11 |
+| variables.rs:222:48:222:50 | a11 | variables.rs:222:14:222:51 | a11 |
+| variables.rs:225:33:225:35 | a12 | variables.rs:225:33:225:35 | a12 |
+| variables.rs:242:9:242:10 | fv | variables.rs:242:9:242:10 | fv |
+| variables.rs:244:9:244:109 | [match(true)] phi | variables.rs:244:9:244:109 | a13 |
+| variables.rs:244:27:244:29 | a13 | variables.rs:244:9:244:109 | a13 |
+| variables.rs:244:35:244:82 | [match(true)] phi | variables.rs:244:9:244:109 | a13 |
+| variables.rs:244:54:244:56 | a13 | variables.rs:244:9:244:109 | a13 |
+| variables.rs:244:79:244:81 | a13 | variables.rs:244:9:244:109 | a13 |
+| variables.rs:244:106:244:108 | a13 | variables.rs:244:9:244:109 | a13 |
+| variables.rs:250:5:250:6 | a8 | variables.rs:250:5:250:6 | a8 |
+| variables.rs:252:9:252:10 | b3 | variables.rs:252:9:252:10 | b3 |
+| variables.rs:253:9:253:10 | c1 | variables.rs:253:9:253:10 | c1 |
+| variables.rs:261:6:261:41 | [match(true)] phi | variables.rs:261:6:261:41 | a9 |
+| variables.rs:261:19:261:20 | a9 | variables.rs:261:6:261:41 | a9 |
+| variables.rs:261:39:261:40 | a9 | variables.rs:261:6:261:41 | a9 |
+| variables.rs:268:9:268:15 | a10 | variables.rs:268:13:268:15 | a10 |
+| variables.rs:269:9:269:14 | b4 | variables.rs:269:13:269:14 | b4 |
+| variables.rs:270:9:270:14 | c2 | variables.rs:270:13:270:14 | c2 |
+| variables.rs:277:9:277:10 | c2 | variables.rs:270:13:270:14 | c2 |
+| variables.rs:278:9:278:10 | b4 | variables.rs:269:13:269:14 | b4 |
+| variables.rs:279:9:279:11 | a10 | variables.rs:268:13:268:15 | a10 |
+| variables.rs:291:13:291:15 | a10 | variables.rs:291:13:291:15 | a10 |
+| variables.rs:292:13:292:14 | b4 | variables.rs:292:13:292:14 | b4 |
+| variables.rs:304:9:304:23 | example_closure | variables.rs:304:9:304:23 | example_closure |
+| variables.rs:305:10:305:10 | x | variables.rs:305:10:305:10 | x |
+| variables.rs:307:9:307:10 | n1 | variables.rs:307:9:307:10 | n1 |
+| variables.rs:312:9:312:26 | immutable_variable | variables.rs:312:9:312:26 | immutable_variable |
+| variables.rs:313:10:313:10 | x | variables.rs:313:10:313:10 | x |
+| variables.rs:315:9:315:10 | n2 | variables.rs:315:9:315:10 | n2 |
+| variables.rs:321:9:321:9 | v | variables.rs:321:9:321:9 | v |
+| variables.rs:323:9:323:12 | text | variables.rs:323:9:323:12 | text |
+| variables.rs:330:9:330:13 | a | variables.rs:330:13:330:13 | a |
+| variables.rs:331:5:331:5 | a | variables.rs:330:13:330:13 | a |
+| variables.rs:339:9:339:13 | ref_i | variables.rs:339:9:339:13 | ref_i |
+| variables.rs:345:17:345:17 | x | variables.rs:345:17:345:17 | x |
+| variables.rs:352:9:352:13 | x | variables.rs:352:13:352:13 | x |
+| variables.rs:353:23:353:23 | x | variables.rs:352:13:352:13 | x |
+| variables.rs:359:9:359:9 | y | variables.rs:359:9:359:9 | y |
+| variables.rs:367:9:367:15 | cap | variables.rs:367:13:367:15 | cap |
+| variables.rs:375:8:375:8 | b | variables.rs:375:8:375:8 | b |
+| variables.rs:377:5:381:5 | phi | variables.rs:376:13:376:13 | x |
+| variables.rs:378:9:378:9 | x | variables.rs:376:13:376:13 | x |
+| variables.rs:380:9:380:9 | x | variables.rs:376:13:376:13 | x |
+| variables.rs:385:13:385:14 | b1 | variables.rs:385:13:385:14 | b1 |
+| variables.rs:385:24:385:25 | b2 | variables.rs:385:24:385:25 | b2 |
+| variables.rs:386:9:386:9 | x | variables.rs:386:9:386:9 | x |
+read
+| variables.rs:12:9:12:10 | x1 | variables.rs:12:9:12:10 | x1 | variables.rs:13:15:13:16 | x1 |
+| variables.rs:17:9:17:14 | x2 | variables.rs:17:13:17:14 | x2 | variables.rs:18:15:18:16 | x2 |
+| variables.rs:19:5:19:6 | x2 | variables.rs:17:13:17:14 | x2 | variables.rs:20:15:20:16 | x2 |
+| variables.rs:24:9:24:10 | x3 | variables.rs:24:9:24:10 | x3 | variables.rs:25:15:25:16 | x3 |
+| variables.rs:24:9:24:10 | x3 | variables.rs:24:9:24:10 | x3 | variables.rs:27:9:27:10 | x3 |
+| variables.rs:26:9:26:10 | x3 | variables.rs:26:9:26:10 | x3 | variables.rs:28:15:28:16 | x3 |
+| variables.rs:32:9:32:10 | x4 | variables.rs:32:9:32:10 | x4 | variables.rs:33:15:33:16 | x4 |
+| variables.rs:32:9:32:10 | x4 | variables.rs:32:9:32:10 | x4 | variables.rs:38:15:38:16 | x4 |
+| variables.rs:35:13:35:14 | x4 | variables.rs:35:13:35:14 | x4 | variables.rs:36:19:36:20 | x4 |
+| variables.rs:49:13:49:14 | a1 | variables.rs:49:13:49:14 | a1 | variables.rs:57:15:57:16 | a1 |
+| variables.rs:50:13:50:14 | b1 | variables.rs:50:13:50:14 | b1 | variables.rs:58:15:58:16 | b1 |
+| variables.rs:53:13:53:13 | x | variables.rs:53:13:53:13 | x | variables.rs:59:15:59:15 | x |
+| variables.rs:54:13:54:13 | y | variables.rs:54:13:54:13 | y | variables.rs:60:15:60:15 | y |
+| variables.rs:64:9:64:10 | p1 | variables.rs:64:9:64:10 | p1 | variables.rs:68:9:68:10 | p1 |
+| variables.rs:66:12:66:13 | a2 | variables.rs:66:12:66:13 | a2 | variables.rs:69:15:69:16 | a2 |
+| variables.rs:67:12:67:13 | b2 | variables.rs:67:12:67:13 | b2 | variables.rs:70:15:70:16 | b2 |
+| variables.rs:76:17:76:22 | s2 | variables.rs:76:21:76:22 | s2 | variables.rs:78:19:78:20 | s2 |
+| variables.rs:83:14:83:15 | x5 | variables.rs:83:14:83:15 | x5 | variables.rs:87:15:87:16 | x5 |
+| variables.rs:93:20:93:25 | s2 | variables.rs:93:24:93:25 | s2 | variables.rs:95:19:95:20 | s2 |
+| variables.rs:100:9:100:10 | x6 | variables.rs:100:9:100:10 | x6 | variables.rs:103:11:103:12 | x6 |
+| variables.rs:101:9:101:10 | y1 | variables.rs:101:9:101:10 | y1 | variables.rs:113:15:113:16 | y1 |
+| variables.rs:105:14:105:15 | y1 | variables.rs:105:14:105:15 | y1 | variables.rs:108:23:108:24 | y1 |
+| variables.rs:117:9:117:15 | numbers | variables.rs:117:9:117:15 | numbers | variables.rs:119:11:119:17 | numbers |
+| variables.rs:117:9:117:15 | numbers | variables.rs:117:9:117:15 | numbers | variables.rs:131:11:131:17 | numbers |
+| variables.rs:121:13:121:17 | first | variables.rs:121:13:121:17 | first | variables.rs:125:23:125:27 | first |
+| variables.rs:122:13:122:17 | third | variables.rs:122:13:122:17 | third | variables.rs:126:23:126:27 | third |
+| variables.rs:123:13:123:17 | fifth | variables.rs:123:13:123:17 | fifth | variables.rs:127:23:127:27 | fifth |
+| variables.rs:133:13:133:17 | first | variables.rs:133:13:133:17 | first | variables.rs:137:23:137:27 | first |
+| variables.rs:135:13:135:16 | last | variables.rs:135:13:135:16 | last | variables.rs:138:23:138:26 | last |
+| variables.rs:144:9:144:10 | p2 | variables.rs:144:9:144:10 | p2 | variables.rs:146:11:146:12 | p2 |
+| variables.rs:148:16:148:17 | x7 | variables.rs:148:16:148:17 | x7 | variables.rs:149:24:149:25 | x7 |
+| variables.rs:158:9:158:11 | msg | variables.rs:158:9:158:11 | msg | variables.rs:160:11:160:13 | msg |
+| variables.rs:162:17:162:35 | [match(true)] id_variable | variables.rs:162:17:162:27 | id_variable | variables.rs:163:24:163:34 | id_variable |
+| variables.rs:167:26:167:27 | id | variables.rs:167:26:167:27 | id | variables.rs:168:23:168:24 | id |
+| variables.rs:178:9:178:14 | either | variables.rs:178:9:178:14 | either | variables.rs:179:11:179:16 | either |
+| variables.rs:180:9:180:44 | [match(true)] phi | variables.rs:180:9:180:44 | a3 | variables.rs:181:26:181:27 | a3 |
+| variables.rs:192:9:192:10 | tv | variables.rs:192:9:192:10 | tv | variables.rs:193:11:193:12 | tv |
+| variables.rs:192:9:192:10 | tv | variables.rs:192:9:192:10 | tv | variables.rs:197:11:197:12 | tv |
+| variables.rs:192:9:192:10 | tv | variables.rs:192:9:192:10 | tv | variables.rs:201:11:201:12 | tv |
+| variables.rs:194:9:194:81 | [match(true)] phi | variables.rs:194:9:194:81 | a4 | variables.rs:195:26:195:27 | a4 |
+| variables.rs:198:9:198:83 | [match(true)] phi | variables.rs:198:9:198:83 | a5 | variables.rs:199:26:199:27 | a5 |
+| variables.rs:202:9:202:83 | [match(true)] phi | variables.rs:202:9:202:83 | a6 | variables.rs:203:26:203:27 | a6 |
+| variables.rs:208:9:208:14 | either | variables.rs:208:9:208:14 | either | variables.rs:209:11:209:16 | either |
+| variables.rs:210:9:210:44 | [match(true)] phi | variables.rs:210:9:210:44 | a7 | variables.rs:211:16:211:17 | a7 |
+| variables.rs:210:9:210:44 | [match(true)] phi | variables.rs:210:9:210:44 | a7 | variables.rs:212:26:212:27 | a7 |
+| variables.rs:218:9:218:14 | either | variables.rs:218:9:218:14 | either | variables.rs:220:11:220:16 | either |
+| variables.rs:222:14:222:51 | [match(true)] phi | variables.rs:222:14:222:51 | a11 | variables.rs:224:23:224:25 | a11 |
+| variables.rs:225:33:225:35 | a12 | variables.rs:225:33:225:35 | a12 | variables.rs:227:28:227:30 | a12 |
+| variables.rs:242:9:242:10 | fv | variables.rs:242:9:242:10 | fv | variables.rs:243:11:243:12 | fv |
+| variables.rs:244:9:244:109 | [match(true)] phi | variables.rs:244:9:244:109 | a13 | variables.rs:245:26:245:28 | a13 |
+| variables.rs:250:5:250:6 | a8 | variables.rs:250:5:250:6 | a8 | variables.rs:255:15:255:16 | a8 |
+| variables.rs:252:9:252:10 | b3 | variables.rs:252:9:252:10 | b3 | variables.rs:256:15:256:16 | b3 |
+| variables.rs:253:9:253:10 | c1 | variables.rs:253:9:253:10 | c1 | variables.rs:257:15:257:16 | c1 |
+| variables.rs:261:6:261:41 | [match(true)] phi | variables.rs:261:6:261:41 | a9 | variables.rs:263:15:263:16 | a9 |
+| variables.rs:268:9:268:15 | a10 | variables.rs:268:13:268:15 | a10 | variables.rs:272:15:272:17 | a10 |
+| variables.rs:269:9:269:14 | b4 | variables.rs:269:13:269:14 | b4 | variables.rs:273:15:273:16 | b4 |
+| variables.rs:270:9:270:14 | c2 | variables.rs:270:13:270:14 | c2 | variables.rs:274:15:274:16 | c2 |
+| variables.rs:277:9:277:10 | c2 | variables.rs:270:13:270:14 | c2 | variables.rs:283:9:283:10 | c2 |
+| variables.rs:277:9:277:10 | c2 | variables.rs:270:13:270:14 | c2 | variables.rs:287:15:287:16 | c2 |
+| variables.rs:278:9:278:10 | b4 | variables.rs:269:13:269:14 | b4 | variables.rs:282:9:282:10 | b4 |
+| variables.rs:278:9:278:10 | b4 | variables.rs:269:13:269:14 | b4 | variables.rs:286:15:286:16 | b4 |
+| variables.rs:278:9:278:10 | b4 | variables.rs:269:13:269:14 | b4 | variables.rs:300:15:300:16 | b4 |
+| variables.rs:279:9:279:11 | a10 | variables.rs:268:13:268:15 | a10 | variables.rs:281:9:281:11 | a10 |
+| variables.rs:279:9:279:11 | a10 | variables.rs:268:13:268:15 | a10 | variables.rs:285:15:285:17 | a10 |
+| variables.rs:279:9:279:11 | a10 | variables.rs:268:13:268:15 | a10 | variables.rs:299:15:299:17 | a10 |
+| variables.rs:291:13:291:15 | a10 | variables.rs:291:13:291:15 | a10 | variables.rs:294:23:294:25 | a10 |
+| variables.rs:292:13:292:14 | b4 | variables.rs:292:13:292:14 | b4 | variables.rs:295:23:295:24 | b4 |
+| variables.rs:304:9:304:23 | example_closure | variables.rs:304:9:304:23 | example_closure | variables.rs:308:9:308:23 | example_closure |
+| variables.rs:305:10:305:10 | x | variables.rs:305:10:305:10 | x | variables.rs:306:9:306:9 | x |
+| variables.rs:307:9:307:10 | n1 | variables.rs:307:9:307:10 | n1 | variables.rs:309:15:309:16 | n1 |
+| variables.rs:312:9:312:26 | immutable_variable | variables.rs:312:9:312:26 | immutable_variable | variables.rs:316:9:316:26 | immutable_variable |
+| variables.rs:313:10:313:10 | x | variables.rs:313:10:313:10 | x | variables.rs:314:9:314:9 | x |
+| variables.rs:315:9:315:10 | n2 | variables.rs:315:9:315:10 | n2 | variables.rs:317:15:317:16 | n2 |
+| variables.rs:321:9:321:9 | v | variables.rs:321:9:321:9 | v | variables.rs:324:12:324:12 | v |
+| variables.rs:323:9:323:12 | text | variables.rs:323:9:323:12 | text | variables.rs:325:19:325:22 | text |
+| variables.rs:331:5:331:5 | a | variables.rs:330:13:330:13 | a | variables.rs:332:15:332:15 | a |
+| variables.rs:331:5:331:5 | a | variables.rs:330:13:330:13 | a | variables.rs:334:15:334:15 | a |
+| variables.rs:339:9:339:13 | ref_i | variables.rs:339:9:339:13 | ref_i | variables.rs:341:6:341:10 | ref_i |
+| variables.rs:345:17:345:17 | x | variables.rs:345:17:345:17 | x | variables.rs:346:6:346:6 | x |
+| variables.rs:345:17:345:17 | x | variables.rs:345:17:345:17 | x | variables.rs:347:10:347:10 | x |
+| variables.rs:345:17:345:17 | x | variables.rs:345:17:345:17 | x | variables.rs:348:10:348:10 | x |
+| variables.rs:353:23:353:23 | x | variables.rs:352:13:352:13 | x | variables.rs:354:15:354:15 | x |
+| variables.rs:359:9:359:9 | y | variables.rs:359:9:359:9 | y | variables.rs:361:6:361:6 | y |
+| variables.rs:367:9:367:15 | cap | variables.rs:367:13:367:15 | cap | variables.rs:371:5:371:7 | cap |
+| variables.rs:375:8:375:8 | b | variables.rs:375:8:375:8 | b | variables.rs:377:8:377:8 | b |
+| variables.rs:377:5:381:5 | phi | variables.rs:376:13:376:13 | x | variables.rs:382:15:382:15 | x |
+| variables.rs:385:13:385:14 | b1 | variables.rs:385:13:385:14 | b1 | variables.rs:387:8:387:9 | b1 |
+| variables.rs:385:24:385:25 | b2 | variables.rs:385:24:385:25 | b2 | variables.rs:393:8:393:9 | b2 |
+| variables.rs:386:9:386:9 | x | variables.rs:386:9:386:9 | x | variables.rs:388:19:388:19 | x |
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+| variables.rs:278:9:278:10 | b4 | variables.rs:269:13:269:14 | b4 | variables.rs:286:15:286:16 | b4 | variables.rs:300:15:300:16 | b4 |
+| variables.rs:279:9:279:11 | a10 | variables.rs:268:13:268:15 | a10 | variables.rs:281:9:281:11 | a10 | variables.rs:285:15:285:17 | a10 |
+| variables.rs:279:9:279:11 | a10 | variables.rs:268:13:268:15 | a10 | variables.rs:285:15:285:17 | a10 | variables.rs:299:15:299:17 | a10 |
+| variables.rs:331:5:331:5 | a | variables.rs:330:13:330:13 | a | variables.rs:332:15:332:15 | a | variables.rs:334:15:334:15 | a |
+| variables.rs:345:17:345:17 | x | variables.rs:345:17:345:17 | x | variables.rs:346:6:346:6 | x | variables.rs:347:10:347:10 | x |
+| variables.rs:345:17:345:17 | x | variables.rs:345:17:345:17 | x | variables.rs:347:10:347:10 | x | variables.rs:348:10:348:10 | x |
+| variables.rs:386:9:386:9 | x | variables.rs:386:9:386:9 | x | variables.rs:388:19:388:19 | x | variables.rs:394:19:394:19 | x |
+| variables.rs:386:9:386:9 | x | variables.rs:386:9:386:9 | x | variables.rs:388:19:388:19 | x | variables.rs:396:19:396:19 | x |
+| variables.rs:386:9:386:9 | x | variables.rs:386:9:386:9 | x | variables.rs:390:19:390:19 | x | variables.rs:394:19:394:19 | x |
+| variables.rs:386:9:386:9 | x | variables.rs:386:9:386:9 | x | variables.rs:390:19:390:19 | x | variables.rs:396:19:396:19 | x |
+phi
+| variables.rs:180:9:180:44 | [match(true)] phi | variables.rs:180:9:180:44 | a3 | variables.rs:180:22:180:23 | a3 |
+| variables.rs:180:9:180:44 | [match(true)] phi | variables.rs:180:9:180:44 | a3 | variables.rs:180:42:180:43 | a3 |
+| variables.rs:194:9:194:81 | [match(true)] phi | variables.rs:194:9:194:81 | a4 | variables.rs:194:28:194:29 | a4 |
+| variables.rs:194:9:194:81 | [match(true)] phi | variables.rs:194:9:194:81 | a4 | variables.rs:194:54:194:55 | a4 |
+| variables.rs:194:9:194:81 | [match(true)] phi | variables.rs:194:9:194:81 | a4 | variables.rs:194:79:194:80 | a4 |
+| variables.rs:198:9:198:83 | [match(true)] phi | variables.rs:198:9:198:83 | a5 | variables.rs:198:10:198:57 | [match(true)] phi |
+| variables.rs:198:9:198:83 | [match(true)] phi | variables.rs:198:9:198:83 | a5 | variables.rs:198:81:198:82 | a5 |
+| variables.rs:198:10:198:57 | [match(true)] phi | variables.rs:198:9:198:83 | a5 | variables.rs:198:29:198:30 | a5 |
+| variables.rs:198:10:198:57 | [match(true)] phi | variables.rs:198:9:198:83 | a5 | variables.rs:198:55:198:56 | a5 |
+| variables.rs:202:9:202:83 | [match(true)] phi | variables.rs:202:9:202:83 | a6 | variables.rs:202:28:202:29 | a6 |
+| variables.rs:202:9:202:83 | [match(true)] phi | variables.rs:202:9:202:83 | a6 | variables.rs:202:35:202:82 | [match(true)] phi |
+| variables.rs:202:35:202:82 | [match(true)] phi | variables.rs:202:9:202:83 | a6 | variables.rs:202:55:202:56 | a6 |
+| variables.rs:202:35:202:82 | [match(true)] phi | variables.rs:202:9:202:83 | a6 | variables.rs:202:80:202:81 | a6 |
+| variables.rs:210:9:210:44 | [match(true)] phi | variables.rs:210:9:210:44 | a7 | variables.rs:210:22:210:23 | a7 |
+| variables.rs:210:9:210:44 | [match(true)] phi | variables.rs:210:9:210:44 | a7 | variables.rs:210:42:210:43 | a7 |
+| variables.rs:222:14:222:51 | [match(true)] phi | variables.rs:222:14:222:51 | a11 | variables.rs:222:27:222:29 | a11 |
+| variables.rs:222:14:222:51 | [match(true)] phi | variables.rs:222:14:222:51 | a11 | variables.rs:222:48:222:50 | a11 |
+| variables.rs:244:9:244:109 | [match(true)] phi | variables.rs:244:9:244:109 | a13 | variables.rs:244:27:244:29 | a13 |
+| variables.rs:244:9:244:109 | [match(true)] phi | variables.rs:244:9:244:109 | a13 | variables.rs:244:35:244:82 | [match(true)] phi |
+| variables.rs:244:9:244:109 | [match(true)] phi | variables.rs:244:9:244:109 | a13 | variables.rs:244:106:244:108 | a13 |
+| variables.rs:244:35:244:82 | [match(true)] phi | variables.rs:244:9:244:109 | a13 | variables.rs:244:54:244:56 | a13 |
+| variables.rs:244:35:244:82 | [match(true)] phi | variables.rs:244:9:244:109 | a13 | variables.rs:244:79:244:81 | a13 |
+| variables.rs:261:6:261:41 | [match(true)] phi | variables.rs:261:6:261:41 | a9 | variables.rs:261:19:261:20 | a9 |
+| variables.rs:261:6:261:41 | [match(true)] phi | variables.rs:261:6:261:41 | a9 | variables.rs:261:39:261:40 | a9 |
+| variables.rs:377:5:381:5 | phi | variables.rs:376:13:376:13 | x | variables.rs:378:9:378:9 | x |
+| variables.rs:377:5:381:5 | phi | variables.rs:376:13:376:13 | x | variables.rs:380:9:380:9 | x |
+phiReadNode
+| variables.rs:387:5:391:5 | SSA phi read(x) | variables.rs:386:9:386:9 | x |
+phiReadNodeRead
+| variables.rs:387:5:391:5 | SSA phi read(x) | variables.rs:386:9:386:9 | x | variables.rs:394:19:394:19 | x |
+| variables.rs:387:5:391:5 | SSA phi read(x) | variables.rs:386:9:386:9 | x | variables.rs:396:19:396:19 | x |
+phiReadInput
+| variables.rs:387:5:391:5 | SSA phi read(x) | variables.rs:386:9:386:9 | x |
diff --git a/rust/ql/test/library-tests/variables/Ssa.ql b/rust/ql/test/library-tests/variables/Ssa.ql
new file mode 100644
index 000000000000..af622e8ee2fe
--- /dev/null
+++ b/rust/ql/test/library-tests/variables/Ssa.ql
@@ -0,0 +1,45 @@
+import rust
+import codeql.rust.controlflow.BasicBlocks
+import codeql.rust.controlflow.ControlFlowGraph
+import codeql.rust.dataflow.Ssa
+import codeql.rust.dataflow.internal.SsaImpl
+import ExposedForTestingOnly
+
+query predicate nonSsaVariable(Variable v) { not v instanceof Ssa::Variable }
+
+query predicate definition(Ssa::Definition def, Variable v) { def.getSourceVariable() = v }
+
+query predicate read(Ssa::Definition def, Variable v, CfgNode read) {
+  def.getSourceVariable() = v and read = def.getARead()
+}
+
+query predicate firstRead(Ssa::Definition def, Variable v, CfgNode read) {
+  def.getSourceVariable() = v and read = def.getAFirstRead()
+}
+
+query predicate lastRead(Ssa::Definition def, Variable v, CfgNode read) {
+  def.getSourceVariable() = v and read = def.getALastRead()
+}
+
+query predicate adjacentReads(Ssa::Definition def, Variable v, CfgNode read1, CfgNode read2) {
+  def.getSourceVariable() = v and
+  def.hasAdjacentReads(read1, read2)
+}
+
+query predicate phi(Ssa::PhiDefinition phi, Variable v, Ssa::Definition input) {
+  phi.getSourceVariable() = v and input = phi.getAnInput()
+}
+
+query predicate phiReadNode(PhiReadNode phi, Variable v) { phi.getSourceVariable() = v }
+
+query predicate phiReadNodeRead(PhiReadNode phi, Variable v, CfgNode read) {
+  phi.getSourceVariable() = v and
+  exists(BasicBlock bb, int i |
+    ssaDefReachesReadExt(v, phi, bb, i) and
+    read = bb.getNode(i)
+  )
+}
+
+query predicate phiReadInput(PhiReadNode phi, DefinitionExt inp) {
+  phiHasInputFromBlockExt(phi, inp, _)
+}
diff --git a/rust/ql/test/library-tests/variables/variables.expected b/rust/ql/test/library-tests/variables/variables.expected
index 09430b5497c0..e96957a62e3f 100644
--- a/rust/ql/test/library-tests/variables/variables.expected
+++ b/rust/ql/test/library-tests/variables/variables.expected
@@ -1,4 +1,7 @@
 testFailures
+| variables.rs:377:8:377:8 | b | Unexpected result: read_access=b |
+| variables.rs:387:8:387:9 | b1 | Unexpected result: read_access=b1 |
+| variables.rs:393:8:393:9 | b2 | Unexpected result: read_access=b2 |
 failures
 variable
 | variables.rs:3:14:3:14 | s |
@@ -76,6 +79,11 @@ variable
 | variables.rs:359:9:359:9 | y |
 | variables.rs:366:13:366:13 | x |
 | variables.rs:367:13:367:15 | cap |
+| variables.rs:375:8:375:8 | b |
+| variables.rs:376:13:376:13 | x |
+| variables.rs:385:13:385:14 | b1 |
+| variables.rs:385:24:385:25 | b2 |
+| variables.rs:386:9:386:9 | x |
 variableAccess
 | variables.rs:13:15:13:16 | x1 | variables.rs:12:9:12:10 | x1 |
 | variables.rs:18:15:18:16 | x2 | variables.rs:17:13:17:14 | x2 |
@@ -178,11 +186,23 @@ variableAccess
 | variables.rs:369:9:369:9 | x | variables.rs:366:13:366:13 | x |
 | variables.rs:371:5:371:7 | cap | variables.rs:367:13:367:15 | cap |
 | variables.rs:372:15:372:15 | x | variables.rs:366:13:366:13 | x |
+| variables.rs:377:8:377:8 | b | variables.rs:375:8:375:8 | b |
+| variables.rs:378:9:378:9 | x | variables.rs:376:13:376:13 | x |
+| variables.rs:380:9:380:9 | x | variables.rs:376:13:376:13 | x |
+| variables.rs:382:15:382:15 | x | variables.rs:376:13:376:13 | x |
+| variables.rs:387:8:387:9 | b1 | variables.rs:385:13:385:14 | b1 |
+| variables.rs:388:19:388:19 | x | variables.rs:386:9:386:9 | x |
+| variables.rs:390:19:390:19 | x | variables.rs:386:9:386:9 | x |
+| variables.rs:393:8:393:9 | b2 | variables.rs:385:24:385:25 | b2 |
+| variables.rs:394:19:394:19 | x | variables.rs:386:9:386:9 | x |
+| variables.rs:396:19:396:19 | x | variables.rs:386:9:386:9 | x |
 variableWriteAccess
 | variables.rs:19:5:19:6 | x2 | variables.rs:17:13:17:14 | x2 |
 | variables.rs:277:9:277:10 | c2 | variables.rs:270:13:270:14 | c2 |
 | variables.rs:278:9:278:10 | b4 | variables.rs:269:13:269:14 | b4 |
 | variables.rs:279:9:279:11 | a10 | variables.rs:268:13:268:15 | a10 |
+| variables.rs:378:9:378:9 | x | variables.rs:376:13:376:13 | x |
+| variables.rs:380:9:380:9 | x | variables.rs:376:13:376:13 | x |
 variableReadAccess
 | variables.rs:13:15:13:16 | x1 | variables.rs:12:9:12:10 | x1 |
 | variables.rs:18:15:18:16 | x2 | variables.rs:17:13:17:14 | x2 |
@@ -275,6 +295,14 @@ variableReadAccess
 | variables.rs:368:19:368:19 | x | variables.rs:366:13:366:13 | x |
 | variables.rs:371:5:371:7 | cap | variables.rs:367:13:367:15 | cap |
 | variables.rs:372:15:372:15 | x | variables.rs:366:13:366:13 | x |
+| variables.rs:377:8:377:8 | b | variables.rs:375:8:375:8 | b |
+| variables.rs:382:15:382:15 | x | variables.rs:376:13:376:13 | x |
+| variables.rs:387:8:387:9 | b1 | variables.rs:385:13:385:14 | b1 |
+| variables.rs:388:19:388:19 | x | variables.rs:386:9:386:9 | x |
+| variables.rs:390:19:390:19 | x | variables.rs:386:9:386:9 | x |
+| variables.rs:393:8:393:9 | b2 | variables.rs:385:24:385:25 | b2 |
+| variables.rs:394:19:394:19 | x | variables.rs:386:9:386:9 | x |
+| variables.rs:396:19:396:19 | x | variables.rs:386:9:386:9 | x |
 variableInitializer
 | variables.rs:12:9:12:10 | x1 | variables.rs:12:14:12:16 | "a" |
 | variables.rs:17:13:17:14 | x2 | variables.rs:17:18:17:18 | 4 |
@@ -308,6 +336,8 @@ variableInitializer
 | variables.rs:359:9:359:9 | y | variables.rs:360:9:360:14 | RefExpr |
 | variables.rs:366:13:366:13 | x | variables.rs:366:17:366:18 | 10 |
 | variables.rs:367:13:367:15 | cap | variables.rs:367:19:370:5 | ClosureExpr |
+| variables.rs:376:13:376:13 | x | variables.rs:376:17:376:17 | 1 |
+| variables.rs:386:9:386:9 | x | variables.rs:386:13:386:13 | 1 |
 capturedVariable
 | variables.rs:366:13:366:13 | x |
 capturedAccess
diff --git a/rust/ql/test/library-tests/variables/variables.rs b/rust/ql/test/library-tests/variables/variables.rs
index bf3491dff613..c36a30a2d0bc 100644
--- a/rust/ql/test/library-tests/variables/variables.rs
+++ b/rust/ql/test/library-tests/variables/variables.rs
@@ -372,6 +372,31 @@ fn capture() {
     print_i64(x); // $ read_access=x
 }
 
+fn phi(b : bool) {
+    let mut x = 1; // x
+    if b {
+        x = 2; // $ write_access=x
+    } else {
+        x = 3; // $ write_access=x
+    }
+    print_i64(x); // $ read_access=x
+}
+
+fn phi_read(b1 : bool, b2 : bool) {
+    let x = 1; // x
+    if b1 {
+        print_i64(x); // $ read_access=x
+    } else {
+        print_i64(x); // $ read_access=x
+    }
+
+    if b2 {
+        print_i64(x); // $ read_access=x
+    } else {
+        print_i64(x); // $ read_access=x
+    }
+}
+
 fn main() {
     immutable_variable();
     mutable_variable();