Promote regular comments to rustdoc comments

src/librustc_errors/lib.rs

@@ -304,17 +304,17 @@ pub struct Handler {
     continue_after_error: AtomicBool,
     delayed_span_bugs: Lock<Vec<Diagnostic>>,
 
-    // This set contains the `DiagnosticId` of all emitted diagnostics to avoid
+    /// This set contains the `DiagnosticId` of all emitted diagnostics to avoid
-    // emitting the same diagnostic with extended help (`--teach`) twice, which
+    /// emitting the same diagnostic with extended help (`--teach`) twice, which
-    // would be uneccessary repetition.
+    /// would be uneccessary repetition.
     taught_diagnostics: Lock<FxHashSet<DiagnosticId>>,
 
     /// Used to suggest rustc --explain <error code>
     emitted_diagnostic_codes: Lock<FxHashSet<DiagnosticId>>,
 
-    // This set contains a hash of every diagnostic that has been emitted by
+    /// This set contains a hash of every diagnostic that has been emitted by
-    // this handler. These hashes is used to avoid emitting the same error
+    /// this handler. These hashes is used to avoid emitting the same error
-    // twice.
+    /// twice.
     emitted_diagnostics: Lock<FxHashSet<u128>>,
 }
 

src/librustc_macros/src/query.rs

@@ -55,7 +55,7 @@ enum QueryModifier {
     /// Generate a dep node based on the dependencies of the query
     Anon,
 
-    // Always evaluate the query, ignoring its depdendencies
+    /// Always evaluate the query, ignoring its depdendencies
     EvalAlways,
 }