Convert NAMED_ASM_LABELS lint to diag struct

compiler/rustc_lint/messages.ftl

@@ -30,6 +30,8 @@ lint_builtin_anonymous_params = anonymous parameters are deprecated and will be
     .suggestion = try naming the parameter or explicitly ignoring it
 
 lint_builtin_asm_labels = avoid using named labels in inline assembly
+    .help = only local labels of the form `<number>:` should be used in inline asm
+    .note = see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 lint_builtin_box_pointers = type uses owned (Box type) pointers: {$ty}
 

compiler/rustc_lint/src/builtin.rs

@@ -30,10 +30,10 @@
         BuiltinExplicitOutlivesSuggestion, BuiltinFeatureIssueNote, BuiltinIncompleteFeatures,
         BuiltinIncompleteFeaturesHelp, BuiltinInternalFeatures, BuiltinKeywordIdents,
         BuiltinMissingCopyImpl, BuiltinMissingDebugImpl, BuiltinMissingDoc,
-        BuiltinMutablesTransmutes, BuiltinNoMangleGeneric, BuiltinNonShorthandFieldPatterns,
-        BuiltinSpecialModuleNameUsed, BuiltinTrivialBounds, BuiltinTypeAliasGenericBounds,
-        BuiltinTypeAliasGenericBoundsSuggestion, BuiltinTypeAliasWhereClause,
-        BuiltinUngatedAsyncFnTrackCaller, BuiltinUnpermittedTypeInit,
+        BuiltinMutablesTransmutes, BuiltinNamedAsmLabel, BuiltinNoMangleGeneric,
+        BuiltinNonShorthandFieldPatterns, BuiltinSpecialModuleNameUsed, BuiltinTrivialBounds,
+        BuiltinTypeAliasGenericBounds, BuiltinTypeAliasGenericBoundsSuggestion,
+        BuiltinTypeAliasWhereClause, BuiltinUngatedAsyncFnTrackCaller, BuiltinUnpermittedTypeInit,
         BuiltinUnpermittedTypeInitSub, BuiltinUnreachablePub, BuiltinUnsafe,
         BuiltinUnstableFeatures, BuiltinUnusedDocComment, BuiltinUnusedDocCommentSub,
         BuiltinWhileTrue, SuggestChangingAssocTypes,
@@ -60,7 +60,7 @@
 use rustc_middle::ty::TypeVisitableExt;
 use rustc_middle::ty::Upcast;
 use rustc_middle::ty::{self, Ty, TyCtxt, VariantDef};
-use rustc_session::lint::{BuiltinLintDiag, FutureIncompatibilityReason};
+use rustc_session::lint::FutureIncompatibilityReason;
 use rustc_session::{declare_lint, declare_lint_pass, impl_lint_pass};
 use rustc_span::edition::Edition;
 use rustc_span::source_map::Spanned;
@@ -2882,16 +2882,7 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'tcx>) {
                     let target_spans: MultiSpan =
                         if spans.len() > 0 { spans.into() } else { (*template_span).into() };
 
-                    cx.span_lint_with_diagnostics(
-                            NAMED_ASM_LABELS,
-                            Some(target_spans),
-                            fluent::lint_builtin_asm_labels,
-                            |_| {},
-                            BuiltinLintDiag::NamedAsmLabel(
-                                "only local labels of the form `<number>:` should be used in inline asm"
-                                    .to_string(),
-                            ),
-                        );
+                    cx.emit_span_lint(NAMED_ASM_LABELS, target_spans, BuiltinNamedAsmLabel);
                 }
             }
         }

compiler/rustc_lint/src/context/diagnostics.rs

@@ -179,10 +179,6 @@ pub(super) fn builtin(sess: &Session, diagnostic: BuiltinLintDiag, diag: &mut Di
                 Applicability::MachineApplicable,
             );
         }
-        BuiltinLintDiag::NamedAsmLabel(help) => {
-            diag.help(help);
-            diag.note("see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information");
-        }
         BuiltinLintDiag::UnexpectedCfgName(name, value) => {
             check_cfg::unexpected_cfg_name(sess, diag, name, value)
         }

compiler/rustc_lint/src/lints.rs

@@ -1947,3 +1947,9 @@ pub struct UnitBindingsDiag {
     #[label]
     pub label: Span,
 }
+
+#[derive(LintDiagnostic)]
+#[diag(lint_builtin_asm_labels)]
+#[help]
+#[note]
+pub struct BuiltinNamedAsmLabel;

compiler/rustc_lint_defs/src/lib.rs

@@ -592,7 +592,6 @@ pub enum BuiltinLintDiag {
     ReservedPrefix(Span),
     TrailingMacro(bool, Ident),
     BreakWithLabelAndLoop(Span),
-    NamedAsmLabel(String),
     UnicodeTextFlow(Span, String),
     UnexpectedCfgName((Symbol, Span), Option<(Symbol, Span)>),
     UnexpectedCfgValue((Symbol, Span), Option<(Symbol, Span)>),