Index: cp/semantics.c
===================================================================
--- cp/semantics.c	(revision 203101)
+++ cp/semantics.c	(working copy)
@@ -8422,6 +8422,7 @@ potential_constant_expression_1 (tree t, bool want
     case OVERLOAD:
     case TEMPLATE_ID_EXPR:
     case LABEL_DECL:
+    case LABEL_EXPR:
     case CONST_DECL:
     case SIZEOF_EXPR:
     case ALIGNOF_EXPR:
Index: testsuite/g++.dg/parse/crash64.C
===================================================================
--- testsuite/g++.dg/parse/crash64.C	(revision 0)
+++ testsuite/g++.dg/parse/crash64.C	(working copy)
@@ -0,0 +1,7 @@
+// PR c++/58565
+// { dg-options "" }
+
+void foo()
+{
+  int i = ({ L: ; });  // { dg-error "void value not ignored" }
+}