Migrate trivially translatable rustc_parse diagnostics

compiler/rustc_parse/src/parser/mod.rs

@@ -43,7 +43,7 @@ use thin_vec::ThinVec;
 use tracing::debug;
 
 use crate::errors::{
-    IncorrectVisibilityRestriction, MismatchedClosingDelimiter, NonStringAbiLiteral,
+    self, IncorrectVisibilityRestriction, MismatchedClosingDelimiter, NonStringAbiLiteral,
 };
 
 bitflags::bitflags! {
@@ -663,15 +663,10 @@ impl<'a> Parser<'a> {
         if case == Case::Insensitive
         && let Some((ident, /* is_raw */ false)) = self.token.ident()
         && ident.as_str().to_lowercase() == kw.as_str().to_lowercase() {
-            self
-                .struct_span_err(ident.span, format!("keyword `{kw}` is written in a wrong case"))
-                .span_suggestion(
-                    ident.span,
-                    "write it in the correct case",
-                    kw,
-                    Applicability::MachineApplicable
-                ).emit();
-
+            self.sess.emit_err(errors::KwBadCase {
+                span: ident.span,
+                kw: kw.as_str()
+            });
             self.bump();
             return true;
         }