diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index 808e5b61b1e..c915d6415de 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -18346,6 +18346,11 @@ cp_parser_explicit_specialization (cp_parser* parser)
   --parser->num_template_parameter_lists;
 }
 
+/* Preserve the attributes across a garbage collect (by making it a GC
+   root), which can occur when parsing a member function.  */
+
+static GTY(()) vec<tree, va_gc> *cp_parser_decl_specs_attrs;
+
 /* Parse a type-specifier.
 
    type-specifier:
@@ -18438,8 +18443,12 @@ cp_parser_type_specifier (cp_parser* parser,
       /* Parse tentatively so that we can back up if we don't find a
 	 class-specifier.  */
       cp_parser_parse_tentatively (parser);
+      if (decl_specs->attributes)
+	vec_safe_push (cp_parser_decl_specs_attrs, decl_specs->attributes);
       /* Look for the class-specifier.  */
       type_spec = cp_parser_class_specifier (parser);
+      if (decl_specs->attributes)
+	cp_parser_decl_specs_attrs->pop ();
       invoke_plugin_callbacks (PLUGIN_FINISH_TYPE, type_spec);
       /* If that worked, we're done.  */
       if (cp_parser_parse_definitely (parser))
diff --git a/gcc/testsuite/g++.dg/other/gc7.C b/gcc/testsuite/g++.dg/other/gc7.C
new file mode 100644
index 00000000000..ab436bac72f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/other/gc7.C
@@ -0,0 +1,16 @@
+// PR c++/91416 - GC during late parsing collects live data.
+// { dg-do compile }
+// { dg-options "--param ggc-min-heapsize=0 --param ggc-min-expand=0" }
+
+__attribute__ ((unused)) struct S {
+  S() { }
+} s;
+
+__attribute__ ((unused)) struct X {
+  void fn ()
+  {
+    __attribute__ ((unused)) struct N {
+	N() { }
+    } n;
+  }
+} x;