Fix typos and outdated comments

compiler/rustc_attr_parsing/src/attributes/codegen_attrs.rs

@@ -169,7 +169,7 @@ fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser) -> Option<Attrib
             return None;
         };
         let Some(classname) = nv.value_as_str() else {
-            // `#[rustc_objc_class = ...]` is expected to be used as an implementatioin detail
+            // `#[rustc_objc_class = ...]` is expected to be used as an implementation detail
             // inside a standard library macro, but `cx.expected_string_literal` exposes too much.
             // Use a custom error message instead.
             cx.emit_err(ObjcClassExpectedStringLiteral { span: nv.value_span });
@@ -201,7 +201,7 @@ fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser) -> Option<Attrib
             return None;
         };
         let Some(methname) = nv.value_as_str() else {
-            // `#[rustc_objc_selector = ...]` is expected to be used as an implementatioin detail
+            // `#[rustc_objc_selector = ...]` is expected to be used as an implementation detail
             // inside a standard library macro, but `cx.expected_string_literal` exposes too much.
             // Use a custom error message instead.
             cx.emit_err(ObjcSelectorExpectedStringLiteral { span: nv.value_span });

compiler/rustc_codegen_ssa/src/mir/mod.rs

@@ -437,7 +437,7 @@ fn arg_local_refs<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
                 assert_eq!(
                     None,
                     num_untupled.replace(tupled_arg_tys.len()),
-                    "Replaced existing num_tupled"
+                    "Replaced existing num_untupled"
                 );
 
                 return LocalRef::Place(place);

compiler/rustc_hir/src/def.rs

@@ -192,7 +192,7 @@ pub enum DefKind {
     /// These are all represented with the same `ExprKind::Closure` in the AST and HIR,
     /// which makes it difficult to distinguish these during def collection. Therefore,
     /// we treat them all the same, and code which needs to distinguish them can match
-    /// or `hir::ClosureKind` or `type_of`.
+    /// on `hir::ClosureKind` or `type_of`.
     Closure,
     /// The definition of a synthetic coroutine body created by the lowering of a
     /// coroutine-closure, such as an async closure.

compiler/rustc_hir/src/target.rs

@@ -1,8 +1,4 @@
-//! This module implements some validity checks for attributes.
-//! In particular it verifies that `#[inline]` and `#[repr]` attributes are
-//! attached to items that actually support them and if there are
-//! conflicts between multiple such attributes attached to the same
-//! item.
+//! This module lists attribute targets, with conversions from other types.
 
 use std::fmt::{self, Display};
 

src/tools/compiletest/src/runtest.rs

@@ -2121,7 +2121,7 @@ fn output_base_name(&self) -> Utf8PathBuf {
     }
 
     /// Prints a message to (captured) stdout if `config.verbose` is true.
-    /// The message is also logged to `tracing::debug!` regardles of verbosity.
+    /// The message is also logged to `tracing::debug!` regardless of verbosity.
     ///
     /// Use `format_args!` as the argument to perform formatting if required.
     fn logv(&self, message: impl fmt::Display) {
@@ -2748,7 +2748,7 @@ fn compare_output(
                 return CompareOutcome::Same;
             }
             if expected_lines.is_empty() {
-                // if we have no lines to check, force a full overwite
+                // if we have no lines to check, force a full overwrite
                 ("", actual)
             } else {
                 // this prints/blesses the subset, not the actual