1 files changed, 15 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/parse/crash54.C b/gcc/testsuite/g++.dg/parse/crash54.C
new file mode 100644
index 000000000..222082ab7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/parse/crash54.C
@@ -0,0 +1,15 @@
+// PR c++/42057
+
+struct A; // { dg-error "forward declaration" }
+
+struct B
+{
+  virtual B* foo(A);
+};
+
+struct C : virtual B
+{
+  virtual C* foo(A) { return 0; } // { dg-error "incomplete type" }
+};
+
+C c;