Add #[track_caller] to lint related diagnostic functions

compiler/rustc_lint/src/levels.rs

@@ -978,6 +978,7 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id:
     /// Returns `true` if the lint's feature is enabled.
     // FIXME only emit this once for each attribute, instead of repeating it 4 times for
     // pre-expansion lints, post-expansion lints, `shallow_lint_levels_on` and `lint_expectations`.
+    #[track_caller]
     fn check_gated_lint(&self, lint_id: LintId, span: Span) -> bool {
         if let Some(feature) = lint_id.lint.feature_gate {
             if !self.sess.features_untracked().enabled(feature) {
@@ -1015,6 +1016,7 @@ pub fn lint_level(&self, lint: &'static Lint) -> LevelAndSource {
     ///
     /// [`struct_lint_level`]: rustc_middle::lint::struct_lint_level#decorate-signature
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub(crate) fn struct_lint(
         &self,
         lint: &'static Lint,
@@ -1028,6 +1030,7 @@ pub(crate) fn struct_lint(
         struct_lint_level(self.sess, lint, level, src, span, msg, decorate)
     }
 
+    #[track_caller]
     pub fn emit_spanned_lint(
         &self,
         lint: &'static Lint,
@@ -1040,6 +1043,7 @@ pub fn emit_spanned_lint(
         });
     }
 
+    #[track_caller]
     pub fn emit_lint(&self, lint: &'static Lint, decorate: impl for<'a> DecorateLint<'a, ()>) {
         let (level, src) = self.lint_level(lint);
         struct_lint_level(self.sess, lint, level, src, None, decorate.msg(), |lint| {

compiler/rustc_middle/src/lint.rs

@@ -278,6 +278,7 @@ pub fn explain_lint_level_source(
 ///     //          ^^^^^^^^^^^^^^^^^^^^^ returns `&mut DiagnosticBuilder` by default
 /// )
 /// ```
+#[track_caller]
 pub fn struct_lint_level(
     sess: &Session,
     lint: &'static Lint,
@@ -291,6 +292,7 @@ pub fn struct_lint_level(
 ) {
     // Avoid codegen bloat from monomorphization by immediately doing dyn dispatch of `decorate` to
     // the "real" work.
+    #[track_caller]
     fn struct_lint_level_impl(
         sess: &Session,
         lint: &'static Lint,

compiler/rustc_middle/src/ty/context.rs

@@ -1860,6 +1860,7 @@ pub fn mk_bound_variable_kinds_from_iter<I, T>(self, iter: I) -> T::Output
 
     /// Emit a lint at `span` from a lint struct (some type that implements `DecorateLint`,
     /// typically generated by `#[derive(LintDiagnostic)]`).
+    #[track_caller]
     pub fn emit_spanned_lint(
         self,
         lint: &'static Lint,
@@ -1880,6 +1881,7 @@ pub fn emit_spanned_lint(
     ///
     /// [`struct_lint_level`]: rustc_middle::lint::struct_lint_level#decorate-signature
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_span_lint_hir(
         self,
         lint: &'static Lint,
@@ -1896,6 +1898,7 @@ pub fn struct_span_lint_hir(
 
     /// Emit a lint from a lint struct (some type that implements `DecorateLint`, typically
     /// generated by `#[derive(LintDiagnostic)]`).
+    #[track_caller]
     pub fn emit_lint(
         self,
         lint: &'static Lint,
@@ -1911,6 +1914,7 @@ pub fn emit_lint(
     ///
     /// [`struct_lint_level`]: rustc_middle::lint::struct_lint_level#decorate-signature
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_lint_node(
         self,
         lint: &'static Lint,

compiler/rustc_session/src/parse.rs

@@ -117,6 +117,7 @@ pub fn feature_err_issue(
 /// Construct a future incompatibility diagnostic for a feature gate.
 ///
 /// This diagnostic is only a warning and *does not cause compilation to fail*.
+#[track_caller]
 pub fn feature_warn(sess: &ParseSess, feature: Symbol, span: Span, explain: &'static str) {
     feature_warn_issue(sess, feature, span, GateIssue::Language, explain);
 }
@@ -129,6 +130,7 @@ pub fn feature_warn(sess: &ParseSess, feature: Symbol, span: Span, explain: &'st
 /// Almost always, you want to use this for a language feature. If so, prefer `feature_warn`.
 #[allow(rustc::diagnostic_outside_of_impl)]
 #[allow(rustc::untranslatable_diagnostic)]
+#[track_caller]
 pub fn feature_warn_issue(
     sess: &ParseSess,
     feature: Symbol,
@@ -351,6 +353,7 @@ pub fn emit_warning<'a>(&'a self, warning: impl IntoDiagnostic<'a, ()>) {
         self.create_warning(warning).emit()
     }
 
+    #[track_caller]
     pub fn create_note<'a>(
         &'a self,
         note: impl IntoDiagnostic<'a, Noted>,
@@ -358,10 +361,12 @@ pub fn create_note<'a>(
         note.into_diagnostic(&self.span_diagnostic)
     }
 
+    #[track_caller]
     pub fn emit_note<'a>(&'a self, note: impl IntoDiagnostic<'a, Noted>) -> Noted {
         self.create_note(note).emit()
     }
 
+    #[track_caller]
     pub fn create_fatal<'a>(
         &'a self,
         fatal: impl IntoDiagnostic<'a, !>,
@@ -369,6 +374,7 @@ pub fn create_fatal<'a>(
         fatal.into_diagnostic(&self.span_diagnostic)
     }
 
+    #[track_caller]
     pub fn emit_fatal<'a>(&'a self, fatal: impl IntoDiagnostic<'a, !>) -> ! {
         self.create_fatal(fatal).emit()
     }
@@ -383,16 +389,19 @@ pub fn struct_err(
     }
 
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_warn(&self, msg: impl Into<DiagnosticMessage>) -> DiagnosticBuilder<'_, ()> {
         self.span_diagnostic.struct_warn(msg)
     }
 
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_fatal(&self, msg: impl Into<DiagnosticMessage>) -> DiagnosticBuilder<'_, !> {
         self.span_diagnostic.struct_fatal(msg)
     }
 
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_diagnostic<G: EmissionGuarantee>(
         &self,
         msg: impl Into<DiagnosticMessage>,