move/fix bug264.c as suggested in issue #1122

test/err/bug264.c

@@ -0,0 +1,62 @@
+/* bug #264 - cc65 fails to warn about a function returning struct */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+typedef uint32_t u32;
+typedef uint16_t u16;
+
+/* this struct is too large, we can only handle max 4 bytes right now */
+typedef struct {
+    u32 quot;
+    u32 rem;
+} udiv_t;
+
+udiv_t div3(u32 in) {
+
+    udiv_t u;
+    u32 q = 0;
+
+    while (in >= 300) {
+        in -= 300;
+        q += 100;
+    }
+
+    while (in >= 30) {
+        in -= 30;
+        q += 10;
+    }
+
+    while (in >= 3) {
+        in -= 3;
+        ++q;
+    }
+
+    u.quot = q;
+    u.rem = in;
+
+    return u;   /* error */
+}
+
+int res = 0;
+
+int main(void) {
+
+    u32 i;
+    div_t d;
+    udiv_t u;
+
+    for (i = 1024; i; i--) {
+        d = div((u16)i, 3);
+        u = div3(i);
+
+        if (d.quot != u.quot || d.rem != u.rem) {
+            printf("Mismatch at %u/3, div %u %u, div3 %u %u\n", i,
+                d.quot, d.rem, u.quot, u.rem);
+            res++;
+        }
+    }
+
+    return res;
+}