added tests as prepared by oliver

test/ref/cc65091007.c

@@ -0,0 +1,27 @@
+/*
+  !!DESCRIPTION!!
+  !!ORIGIN!!      testsuite
+  !!LICENCE!!     Public Domain
+  !!AUTHOR!!      Johan Kotlinski
+*/
+
+/*
+This produces the compiler error "test.c(9): Error: Assignment to const"
+Shouldn't be an error, should it? baz is const, bar isn't.
+*/
+
+typedef struct {
+    char foo;
+} Bar;
+
+int main() {
+    Bar bar;
+    Bar* const baz = &bar;
+
+    baz->foo = 1;
+
+    printf("it works :)\n");
+
+    return 0;
+}
+