Add testcase for incomplete call/return types for calls.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67486 91177308-0d34-0410-b5e6-96231b3b80d8

test/Sema/incomplete-call.c

@@ -0,0 +1,13 @@
+// RUN: clang -fsyntax-only -verify %s
+
+struct foo; // expected-note 3 {{forward declaration of 'struct foo'}}
+
+struct foo a();
+void b(struct foo);
+void c();
+
+void func() {
+  a(); // expected-error{{return type of called function ('struct foo') is incomplete}}
+  b(*(struct foo*)0); // expected-error{{argument type 'struct foo' is incomplete}}
+  c(*(struct foo*)0); // expected-error{{argument type 'struct foo' is incomplete}}
+}