1 files changed, 43 insertions, 0 deletions
diff --git a/validation/initializer-entry-defined-twice.c b/validation/initializer-entry-defined-twice.c
new file mode 100644
index 00000000..80434f1c
--- /dev/null
+++ b/validation/initializer-entry-defined-twice.c
@@ -0,0 +1,43 @@
+/* Tests for the "Initializer entry defined twice" warning. */
+
+/* Initializing a struct field twice should trigger the warning. */
+struct normal {
+	int field1;
+	int field2;
+};
+
+struct normal struct_error = {
+	.field1 = 0,
+	.field1 = 0
+};
+
+/* Initializing two different fields of a union should trigger the warning. */
+struct has_union {
+	int x;
+	union {
+		int a;
+		int b;
+	} y;
+	int z;
+};
+
+struct has_union union_error = {
+	.y = {
+		.a = 0,
+		.b = 0
+	}
+};
+
+/* Empty structures can make two fields have the same offset in a struct.
+ * Initialzing both should not trigger the warning. */
+struct empty { };
+
+struct same_offset {
+	struct empty field1;
+	int field2;
+};
+
+struct same_offset not_an_error = {
+	.field1 = { },
+	.field2 = 0
+};