diff --git a/cargo-dylint/tests/ci.rs b/cargo-dylint/tests/ci.rs
index d9548dd60..51abc5737 100644
--- a/cargo-dylint/tests/ci.rs
+++ b/cargo-dylint/tests/ci.rs
@@ -242,7 +242,7 @@ fn duplicate_dependencies() {
         let stdout_actual = std::str::from_utf8(&assert.get_output().stdout).unwrap();
         let package_versions = stdout_actual
             .lines()
-            .filter(|line| line.chars().next().map_or(false, char::is_alphabetic))
+            .filter(|line| line.chars().next().is_some_and(char::is_alphabetic))
             .map(|line| {
                 <[_; 2]>::try_from(line.split_ascii_whitespace().take(2).collect::<Vec<_>>())
                     .unwrap()
diff --git a/driver/src/lib.rs b/driver/src/lib.rs
index 316e17beb..96ba77e99 100644
--- a/driver/src/lib.rs
+++ b/driver/src/lib.rs
@@ -245,8 +245,7 @@ impl rustc_driver::Callbacks for Callbacks {
             let dylint_libs = env::var(env::DYLINT_LIBS).ok();
             let dylint_metadata = env::var(env::DYLINT_METADATA).ok();
             let dylint_no_deps = env::var(env::DYLINT_NO_DEPS).ok();
-            let dylint_no_deps_enabled =
-                dylint_no_deps.as_ref().map_or(false, |value| value != "0");
+            let dylint_no_deps_enabled = dylint_no_deps.as_ref().is_some_and(|value| value != "0");
             let cargo_primary_package_is_set = env::var(env::CARGO_PRIMARY_PACKAGE).is_ok();
 
             sess.parse_sess().env_depinfo.lock().insert((
@@ -299,7 +298,7 @@ impl rustc_driver::Callbacks for Callbacks {
 
 #[must_use]
 fn list_enabled() -> bool {
-    env::var(env::DYLINT_LIST).map_or(false, |value| value != "0")
+    env::var(env::DYLINT_LIST).is_ok_and(|value| value != "0")
 }
 
 fn list_lints(before: &BTreeSet<Lint>, after: &BTreeSet<Lint>) {
@@ -389,6 +388,8 @@ fn rustc_args<T: AsRef<OsStr>, U: AsRef<str>, V: AsRef<Path>>(
     let mut rustc_args = Vec::new();
 
     let first_arg = args.peek();
+    // smoelius: `Option::is_none_or` is too recent for some toolchains we test with.
+    #[allow(clippy::unnecessary_map_or)]
     if first_arg.map_or(true, |arg| !is_rustc(arg)) {
         rustc_args.push("rustc".to_owned());
     }
diff --git a/dylint/build.rs b/dylint/build.rs
index 016ae955d..f96b676fb 100644
--- a/dylint/build.rs
+++ b/dylint/build.rs
@@ -26,7 +26,7 @@ fn write_dylint_driver_manifest_dir() {
     let dylint_driver_manifest_dir = if dylint_manifest_dir.starts_with(cargo_home)
         || dylint_manifest_dir
             .parent()
-            .map_or(false, |path| path.ends_with("target/package"))
+            .is_some_and(|path| path.ends_with("target/package"))
         || env::var(env::DOCS_RS).is_ok()
     {
         "None".to_owned()
diff --git a/examples/experimental/missing_doc_comment_openai/src/lib.rs b/examples/experimental/missing_doc_comment_openai/src/lib.rs
index a9ff0182a..d72ceef63 100644
--- a/examples/experimental/missing_doc_comment_openai/src/lib.rs
+++ b/examples/experimental/missing_doc_comment_openai/src/lib.rs
@@ -375,7 +375,7 @@ fn skip_preceding_line_comments(cx: &LateContext<'_>, mut span: Span) -> Span {
         let lo_prev_relative = sf.lines()[line];
         let lo_prev = sf.absolute_position(lo_prev_relative);
         let span_prev = span.with_lo(lo_prev);
-        if snippet_opt(cx, span_prev).map_or(false, |snippet| snippet.starts_with("//")) {
+        if snippet_opt(cx, span_prev).is_some_and(|snippet| snippet.starts_with("//")) {
             span = span_prev;
         } else {
             break;
@@ -387,12 +387,12 @@ fn skip_preceding_line_comments(cx: &LateContext<'_>, mut span: Span) -> Span {
 #[must_use]
 fn enabled(name: &str) -> bool {
     let key = env!("CARGO_PKG_NAME").to_uppercase() + "_" + name;
-    std::env::var(key).map_or(false, |value| value != "0")
+    std::env::var(key).is_ok_and(|value| value != "0")
 }
 
 #[must_use]
 fn testing() -> bool {
-    std::env::var(OPENAI_API_KEY).map_or(false, |value| value.to_lowercase().contains("test"))
+    std::env::var(OPENAI_API_KEY).is_ok_and(|value| value.to_lowercase().contains("test"))
 }
 
 #[cfg(test)]
diff --git a/examples/general/abs_home_path/src/lib.rs b/examples/general/abs_home_path/src/lib.rs
index 88e9b0b02..3928578ad 100644
--- a/examples/general/abs_home_path/src/lib.rs
+++ b/examples/general/abs_home_path/src/lib.rs
@@ -78,7 +78,7 @@ impl<'tcx> LateLintPass<'tcx> for AbsHomePath {
                 .home
                 .get_or_init(home::home_dir)
                 .as_ref()
-                .map_or(false, |dir| path.starts_with(dir))
+                .is_some_and(|dir| path.starts_with(dir))
         {
             span_lint(
                 cx,
diff --git a/examples/general/non_local_effect_before_error_return/src/lib.rs b/examples/general/non_local_effect_before_error_return/src/lib.rs
index eaaf4139c..00a695ba2 100644
--- a/examples/general/non_local_effect_before_error_return/src/lib.rs
+++ b/examples/general/non_local_effect_before_error_return/src/lib.rs
@@ -210,7 +210,7 @@ fn in_async_function(tcx: ty::TyCtxt<'_>, hir_id: rustc_hir::HirId) -> bool {
         .chain(tcx.hir().parent_iter(hir_id))
         .any(|(_, node)| {
             node.fn_kind()
-                .map_or(false, |fn_kind| fn_kind.asyncness().is_async())
+                .is_some_and(|fn_kind| fn_kind.asyncness().is_async())
         })
 }
 
@@ -237,7 +237,7 @@ fn is_call_with_mut_ref<'tcx>(
             ..
         } = &terminator.kind
         // smoelius: `deref_mut` generates too much noise.
-        && func.const_fn_def().map_or(true, |(def_id, _)| {
+        && func.const_fn_def().is_none_or(|(def_id, _)| {
             !cx.tcx.is_diagnostic_item(sym::deref_mut_method, def_id)
         })
         && let (locals, constants) = collect_locals_and_constants(cx, mir, path, args.iter().map(|arg| &arg.node))
@@ -314,12 +314,12 @@ fn collect_locals_and_constants<'tcx>(
                 && let followed_widely = locals_widely.remove(destination.local)
                 && (followed_narrowly || followed_widely)
             {
-                let width_preserving = func.const_fn_def().map_or(false, |(def_id, _)| {
+                let width_preserving = func.const_fn_def().is_some_and(|(def_id, _)| {
                     WIDTH_PRESERVING
                         .iter()
                         .any(|path| match_def_path(cx, def_id, path))
                 });
-                let widening = func.const_fn_def().map_or(false, |(def_id, _)| {
+                let widening = func.const_fn_def().is_some_and(|(def_id, _)| {
                     WIDENING.iter().any(|path| match_def_path(cx, def_id, path))
                 });
                 for arg in args {
@@ -430,7 +430,7 @@ fn error_note(span: Option<Span>) -> impl FnOnce(&mut Diag<'_, ()>) {
 #[must_use]
 fn enabled(opt: &str) -> bool {
     let key = env!("CARGO_PKG_NAME").to_uppercase() + "_" + opt;
-    std::env::var(key).map_or(false, |value| value != "0")
+    std::env::var(key).is_ok_and(|value| value != "0")
 }
 
 #[test]
diff --git a/examples/restriction/collapsible_unwrap/src/lib.rs b/examples/restriction/collapsible_unwrap/src/lib.rs
index b78583659..61b67950b 100644
--- a/examples/restriction/collapsible_unwrap/src/lib.rs
+++ b/examples/restriction/collapsible_unwrap/src/lib.rs
@@ -95,7 +95,7 @@ impl CollapsibleUnwrap {
                     let needs_mut = cx
                         .typeck_results()
                         .type_dependent_def_id(expr.hir_id)
-                        .map_or(false, |def_id| has_ref_mut_self(cx, def_id));
+                        .is_some_and(|def_id| has_ref_mut_self(cx, def_id));
                     let recv_ty = cx.typeck_results().expr_ty(recv);
                     let name = suggest_name_from_type(cx, recv_ty);
                     recv = inner_recv;
diff --git a/examples/restriction/inconsistent_qualification/src/lib.rs b/examples/restriction/inconsistent_qualification/src/lib.rs
index ae45a1350..6a6b6ecef 100644
--- a/examples/restriction/inconsistent_qualification/src/lib.rs
+++ b/examples/restriction/inconsistent_qualification/src/lib.rs
@@ -232,7 +232,7 @@ impl<'tcx> Visitor<'tcx> for UseVisitor<'_, 'tcx, '_> {
 }
 
 fn is_local(res: Res) -> bool {
-    res.opt_def_id().map_or(false, DefId::is_local)
+    res.opt_def_id().is_some_and(DefId::is_local)
 }
 
 fn get_owner(tcx: TyCtxt<'_>, hir_id: HirId) -> Option<OwnerNode<'_>> {
diff --git a/examples/restriction/overscoped_allow/src/lib.rs b/examples/restriction/overscoped_allow/src/lib.rs
index d1fba8a08..e9680a071 100644
--- a/examples/restriction/overscoped_allow/src/lib.rs
+++ b/examples/restriction/overscoped_allow/src/lib.rs
@@ -382,7 +382,7 @@ fn include_trailing_semicolons(cx: &LateContext<'_>, mut span: Span) -> Span {
     };
     while span.hi() < file.end_position() {
         let next = span.with_hi(span.hi() + BytePos(1));
-        if !snippet_opt(cx, next).map_or(false, |snip| snip.ends_with(';')) {
+        if !snippet_opt(cx, next).is_some_and(|snip| snip.ends_with(';')) {
             break;
         }
         span = next;
@@ -456,8 +456,7 @@ fn can_have_attrs(cx: &LateContext<'_>, hir_id: HirId) -> bool {
 }
 
 fn is_lint_attr(attr: &Attribute) -> bool {
-    attr.ident()
-        .map_or(false, |ident| is_lint_level(ident.name))
+    attr.ident().is_some_and(|ident| is_lint_level(ident.name))
 }
 
 // smoelius: `is_lint_level` was copied from:
diff --git a/examples/supplementary/unnecessary_borrow_mut/src/lib.rs b/examples/supplementary/unnecessary_borrow_mut/src/lib.rs
index 3cbf6613a..50139e747 100644
--- a/examples/supplementary/unnecessary_borrow_mut/src/lib.rs
+++ b/examples/supplementary/unnecessary_borrow_mut/src/lib.rs
@@ -224,7 +224,7 @@ impl<'tcx> Visitor<'tcx> for V<'tcx> {
 #[must_use]
 fn enabled(opt: &str) -> bool {
     let key = env!("CARGO_PKG_NAME").to_uppercase() + "_" + opt;
-    std::env::var(key).map_or(false, |value| value != "0")
+    std::env::var(key).is_ok_and(|value| value != "0")
 }
 
 #[test]
diff --git a/examples/supplementary/unnecessary_conversion_for_trait/src/check_inherents.rs b/examples/supplementary/unnecessary_conversion_for_trait/src/check_inherents.rs
index b96a8ec38..4711a3fad 100644
--- a/examples/supplementary/unnecessary_conversion_for_trait/src/check_inherents.rs
+++ b/examples/supplementary/unnecessary_conversion_for_trait/src/check_inherents.rs
@@ -55,7 +55,7 @@ pub fn check_inherents(cx: &LateContext<'_>) {
             let ty = peel_unwanted(cx, def_id, ty);
             ty.is_slice()
                 || ty.is_str()
-                || ty.ty_adt_def().map_or(false, |adt_def| {
+                || ty.ty_adt_def().is_some_and(|adt_def| {
                     type_paths
                         .iter()
                         .any(|path| match_def_path(cx, adt_def.did(), path))
diff --git a/examples/supplementary/unnecessary_conversion_for_trait/src/lib.rs b/examples/supplementary/unnecessary_conversion_for_trait/src/lib.rs
index 39c678bca..0c785b5b4 100644
--- a/examples/supplementary/unnecessary_conversion_for_trait/src/lib.rs
+++ b/examples/supplementary/unnecessary_conversion_for_trait/src/lib.rs
@@ -706,7 +706,7 @@ fn build_ty_and_refs_prefix<'tcx>(
 #[must_use]
 fn enabled(name: &str) -> bool {
     let key = option(name);
-    std::env::var(key).map_or(false, |value| value != "0")
+    std::env::var(key).is_ok_and(|value| value != "0")
 }
 
 fn option(name: &str) -> String {
diff --git a/internal/src/env.rs b/internal/src/env.rs
index b58057d94..9abac8bdc 100644
--- a/internal/src/env.rs
+++ b/internal/src/env.rs
@@ -56,7 +56,7 @@ declare_const!(TARGET);
 /// ```
 #[must_use]
 pub fn enabled(key: &str) -> bool {
-    std::env::var(key).map_or(false, |value| value != "0")
+    std::env::var(key).is_ok_and(|value| value != "0")
 }
 
 /// A wrapper around `std::env::var` that converts the error into an `anyhow::Error`.
diff --git a/utils/testing/src/lib.rs b/utils/testing/src/lib.rs
index c71291577..abb9d8524 100644
--- a/utils/testing/src/lib.rs
+++ b/utils/testing/src/lib.rs
@@ -337,7 +337,7 @@ fn rustc_flags(metadata: &Metadata, package: &Package, target: &Target) -> Resul
                     .split(' ')
                     .map(ToOwned::to_owned)
                     .collect::<Vec<_>>();
-                if args.first().map_or(false, is_rustc)
+                if args.first().is_some_and(is_rustc)
                     && args
                         .as_slice()
                         .windows(2)