Migrate doc_comment_on_fn_param, forbidden_attr_on_fn_param

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -372,19 +372,9 @@ fn check_decl_attrs(&self, fn_decl: &FnDecl) {
             })
             .for_each(|attr| {
                 if attr.is_doc_comment() {
-                    self.err_handler()
+                    self.session.emit_err(DocCommentOnFnParam { span: attr.span });
-                        .struct_span_err(
-                            attr.span,
-                            "documentation comments cannot be applied to function parameters",
-                        )
-                        .span_label(attr.span, "doc comments are not allowed here")
-                        .emit();
                 } else {
-                    self.err_handler().span_err(
+                    self.session.emit_err(ForbiddenAttrOnFnParam { span: attr.span });
-                        attr.span,
-                        "allow, cfg, cfg_attr, deny, expect, \
-                forbid, and warn are the only allowed built-in attributes in function parameters",
-                    );
                 }
             });
     }

compiler/rustc_ast_passes/src/errors.rs

@@ -126,3 +126,18 @@ pub struct CVarArgsNotLast {
     #[primary_span]
     pub span: Span,
 }
+
+#[derive(SessionDiagnostic)]
+#[error(ast_passes::doc_comment_on_fn_param)]
+pub struct DocCommentOnFnParam {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+}
+
+#[derive(SessionDiagnostic)]
+#[error(ast_passes::forbidden_attr_on_fn_param)]
+pub struct ForbiddenAttrOnFnParam {
+    #[primary_span]
+    pub span: Span,
+}

compiler/rustc_error_messages/locales/en-US/ast_passes.ftl

@@ -46,3 +46,10 @@ ast_passes_c_var_args_without_named_arg =
 
 ast_passes_c_var_args_not_last =
     `...` must be the last argument of a C-variadic function
+
+ast_passes_doc_comment_on_fn_param =
+    documentation comments cannot be applied to function parameters
+    .label = doc comments are not allowed here
+
+ast_passes_forbidden_attr_on_fn_param =
+    allow, cfg, cfg_attr, deny, expect, forbid, and warn are the only allowed built-in attributes in function parameters