Add #[track_caller] to lint related diagnostic functions

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 @@ impl<'tcx> TyCtxt<'tcx> {
 
     /// 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 @@ impl<'tcx> TyCtxt<'tcx> {
     ///
     /// [`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 @@ impl<'tcx> TyCtxt<'tcx> {
 
     /// 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 @@ impl<'tcx> TyCtxt<'tcx> {
     ///
     /// [`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,