Catch accidental foo == BAR; where foo = BAR; was most likely intended. #2274

test/test_suite/expressions/discarded_binary.c3

@@ -0,0 +1,19 @@
+enum Foo
+{
+	COMMENT
+}
+
+fn int main()
+{
+	Foo state = COMMENT;
+	char c;
+	switch (c)
+	{
+		case '#':
+			(void)(state == COMMENT);
+			state == COMMENT; // #error: This equals check was discarded
+			int a = 0;
+			a == 0; // #error: This equals check was discarded
+	}
+	return 0;
+}