1 files changed, 20 insertions, 0 deletions
diff --git a/clang/test/Sema/cast-to-union.c b/clang/test/Sema/cast-to-union.c
new file mode 100644
index 0000000..c32964d
--- /dev/null
+++ b/clang/test/Sema/cast-to-union.c
@@ -0,0 +1,20 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -pedantic %s
+
+union u { int i; unsigned : 3; };
+void f(union u);
+
+void test(int x) {
+  f((union u)x); // expected-warning {{C99 forbids casts to union type}}
+  f((union u)&x); // expected-error {{cast to union type from type 'int *' not present in union}}
+  f((union u)2U); // expected-error {{cast to union type from type 'unsigned int' not present in union}}
+}
+
+union u w = (union u)2; // expected-warning {{C99 forbids casts to union type}}
+union u ww = (union u)1.0; // expected-error{{cast to union type from type 'double' not present in union}}
+union u x = 7; // expected-error{{initializing 'union u' with an expression of incompatible type 'int'}}
+int i;
+union u zz = (union u)i; // expected-error{{initializer element is not a compile-time constant}}  expected-warning {{C99 forbids casts to union type}}
+
+struct s {int a, b;};
+struct s y = { 1, 5 };
+struct s z = (struct s){ 1, 5 };