Rename opt_span_diag_lint into opt_span_lint and remove emit_diag_lint

compiler/rustc_lint/src/context.rs

@@ -516,7 +516,7 @@ pub trait LintContext {
     ///
     /// [`emit_lint_base`]: rustc_middle::lint::emit_lint_base#decorate-signature
     #[track_caller]
-    fn opt_span_diag_lint<S: Into<MultiSpan>>(
+    fn opt_span_lint<S: Into<MultiSpan>>(
         &self,
         lint: &'static Lint,
         span: Option<S>,
@@ -532,13 +532,7 @@ pub trait LintContext {
         span: S,
         decorator: impl for<'a> Diagnostic<'a, ()>,
     ) {
-        self.opt_span_diag_lint(lint, Some(span), decorator);
-    }
-
-    /// Emit a lint from a lint struct (some type that implements `Diagnostic`, typically
-    /// generated by `#[derive(Diagnostic)]`).
-    fn emit_diag_lint(&self, lint: &'static Lint, decorator: impl for<'a> Diagnostic<'a, ()>) {
-        self.opt_span_diag_lint(lint, None as Option<Span>, decorator);
+        self.opt_span_lint(lint, Some(span), decorator);
     }
 
     /// This returns the lint level for the given lint at the current location.
@@ -594,7 +588,7 @@ impl<'tcx> LintContext for LateContext<'tcx> {
         self.tcx.sess
     }
 
-    fn opt_span_diag_lint<S: Into<MultiSpan>>(
+    fn opt_span_lint<S: Into<MultiSpan>>(
         &self,
         lint: &'static Lint,
         span: Option<S>,
@@ -619,13 +613,13 @@ impl LintContext for EarlyContext<'_> {
         self.builder.sess()
     }
 
-    fn opt_span_diag_lint<S: Into<MultiSpan>>(
+    fn opt_span_lint<S: Into<MultiSpan>>(
         &self,
         lint: &'static Lint,
         span: Option<S>,
         decorator: impl for<'a> Diagnostic<'a, ()>,
     ) {
-        self.builder.opt_span_diag_lint(lint, span.map(|s| s.into()), decorator)
+        self.builder.opt_span_lint(lint, span.map(|s| s.into()), decorator)
     }
 
     fn get_lint_level(&self, lint: &'static Lint) -> LevelAndSource {

compiler/rustc_lint/src/early.rs

@@ -39,7 +39,7 @@ impl<'ecx, 'tcx, T: EarlyLintPass> EarlyContextAndPass<'ecx, 'tcx, T> {
             let BufferedEarlyLint { span, node_id: _, lint_id, diagnostic } = early_lint;
             match diagnostic {
                 DecorateDiagCompat::Builtin(b) => {
-                    self.context.opt_span_diag_lint(
+                    self.context.opt_span_lint(
                         lint_id.lint,
                         span,
                         DecorateBuiltinLint {
@@ -50,7 +50,7 @@ impl<'ecx, 'tcx, T: EarlyLintPass> EarlyContextAndPass<'ecx, 'tcx, T> {
                     );
                 }
                 DecorateDiagCompat::Dynamic(d) => {
-                    self.context.opt_span_diag_lint(lint_id.lint, span, d);
+                    self.context.opt_span_lint(lint_id.lint, span, d);
                 }
             }
         }

compiler/rustc_lint/src/levels.rs

@@ -1001,7 +1001,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
     /// Used to emit a lint-related diagnostic based on the current state of
     /// this lint context.
     #[track_caller]
-    pub(crate) fn opt_span_diag_lint(
+    pub(crate) fn opt_span_lint(
         &self,
         lint: &'static Lint,
         span: Option<MultiSpan>,