Run clippy on the test suite

This makes sure that we're not responsible for Clippy triggering in the
user's code.

Not sure whether Clippy is *supposed* to trigger in macro output, but it
is what it is.

To run clippy on the test suite we need to use the --all --all-targets
flags, which have a side effect of Clippy finding the benches/ directory
even though it has been commented out in Cargo.toml. This means we can
no longer keep the criterion dev-dependency commented out.

.github/workflows/rust.yml

@@ -33,4 +33,4 @@ jobs:
         toolchain: nightly
         override: true
         components: clippy
-    - run: cargo clippy -- -D warnings
+    - run: cargo clippy --all --all-targets -- -D warnings

Cargo.toml

@@ -23,13 +23,13 @@ optional = true
 [features]
 std = []
 
-#[dev-dependencies]
-#criterion = "0.3"
-#
-#[[bench]]
-#name = "from_iterator"
-#harness = false
-#path = "benches/from_iterator.rs"
+[dev-dependencies]
+criterion = "0.3"
+
+[[bench]]
+name = "from_iterator"
+harness = false
+path = "benches/from_iterator.rs"
 
 [workspace]
 members = [

test_suite/common.rs

@@ -86,7 +86,7 @@ fn iterator() {
     ];
 
     for &(bitflag, expected) in tests {
-        assert!(bitflag.iter().zip(expected.iter().cloned()).all(|(a, b)| a == b));
+        assert!(bitflag.iter().zip(expected.iter().copied()).all(|(a, b)| a == b));
         // If cloned, the iterator will yield the same elements.
         let it = bitflag.iter();
         assert!(it.clone().zip(it).all(|(a, b)| a == b));
@@ -109,7 +109,7 @@ fn assign_ops() {
 }
 
 #[test]
-fn fn_derive() {
+const fn fn_derive() {
     #[bitflags]
     #[derive(Copy, Clone, Debug)]
     #[repr(u8)]
@@ -119,7 +119,7 @@ fn fn_derive() {
 }
 
 #[test]
-fn module() {
+const fn module() {
     mod some_modules {
         #[enumflags2::bitflags]
         #[derive(Copy, Clone, Debug)]
@@ -145,9 +145,6 @@ fn inferred_values() {
         SpecifiedB = 4,
     }
 
-    assert_eq!(Inferred::Infer2 as u8, 2);
-    assert_eq!(Inferred::Infer8 as u8, 8);
-
     #[bitflags]
     #[derive(Copy, Clone, Debug)]
     #[repr(u8)]
@@ -158,6 +155,9 @@ fn inferred_values() {
         Infer8,
     }
 
+    assert_eq!(Inferred::Infer2 as u8, 2);
+    assert_eq!(Inferred::Infer8 as u8, 8);
+
     assert_eq!(OnlyInferred::Infer1 as u8, 1);
     assert_eq!(OnlyInferred::Infer2 as u8, 2);
     assert_eq!(OnlyInferred::Infer4 as u8, 4);

test_suite/tests/bitflag_tests_2018.rs

@@ -1,3 +1,8 @@
-use enumflags2::bitflags;
+// "an inner attribute is not permitted in this context" :/
+#[deny(clippy::all, clippy::pedantic, clippy::nursery)]
+mod everything {
 
-include!("../common.rs");
+    use enumflags2::bitflags;
+
+    include!("../common.rs");
+}