added tests as prepared by oliver

test/err/cc65091001.c

@@ -0,0 +1,29 @@
+/*
+  !!DESCRIPTION!! invalid binary operation on pointer, should not compile
+  !!ORIGIN!!      testsuite
+  !!LICENCE!!     Public Domain
+  !!AUTHOR!!
+*/
+
+/* > Gets stuck in an endless loop with -O. */
+
+#include <assert.h>
+#include <string.h>
+typedef unsigned char U8;
+char var = 0xf0;
+char fn(char bar)
+{
+    char* ptr = (char*)0xf;
+    var |= ptr; /* should throw an error here */
+    while (var > bar)
+        var <<= 1;
+    return 0;
+}
+int main() {
+    fn(0x7f);
+    assert(0);
+
+    printf("it works :)\n");
+
+    return 0;
+}