resolve: Implement a lint for out-of-scope use of macro_rules

compiler/rustc_lint/src/context/diagnostics.rs

@@ -434,5 +434,8 @@ pub(super) fn decorate_lint(sess: &Session, diagnostic: BuiltinLintDiag, diag: &
             lints::InnerAttributeUnstable::CustomInnerAttribute
         }
         .decorate_lint(diag),
+        BuiltinLintDiag::OutOfScopeMacroCalls { path } => {
+            lints::OutOfScopeMacroCalls { path }.decorate_lint(diag)
+        }
     }
 }

compiler/rustc_lint/src/lints.rs

@@ -2911,3 +2911,10 @@ pub struct UnsafeAttrOutsideUnsafeSuggestion {
     #[suggestion_part(code = ")")]
     pub right: Span,
 }
+
+#[derive(LintDiagnostic)]
+#[diag(lint_out_of_scope_macro_calls)]
+#[help]
+pub struct OutOfScopeMacroCalls {
+    pub path: String,
+}