Rename DiagnosticBuilder::handler as DiagnosticBuilder::dcx.

Author: nnethercote

compiler/rustc_errors/src/diagnostic_builder.rs

@@ -441,7 +441,7 @@ impl<'a, G: EmissionGuarantee> DiagnosticBuilder<'a, G> {
     }
 
     /// Retrieves the [`DiagCtxt`] if available
-    pub fn handler(&self) -> Option<&DiagCtxt> {
+    pub fn dcx(&self) -> Option<&DiagCtxt> {
         match self.inner.state {
             DiagnosticBuilderState::Emittable(handler) => Some(handler),
             DiagnosticBuilderState::AlreadyEmittedOrDuringCancellation => None,

compiler/rustc_mir_transform/src/errors.rs

@@ -184,7 +184,7 @@ pub(crate) struct UnsafeOpInUnsafeFn {
 impl<'a> DecorateLint<'a, ()> for UnsafeOpInUnsafeFn {
     #[track_caller]
     fn decorate_lint<'b>(self, diag: &'b mut DiagnosticBuilder<'a, ()>) {
-        let handler = diag.handler().expect("lint should not yet be emitted");
+        let handler = diag.dcx().expect("lint should not yet be emitted");
         let desc = handler.eagerly_translate_to_string(self.details.label(), [].into_iter());
         diag.set_arg("details", desc);
         diag.span_label(self.details.span, self.details.label());