Not a bug, just a diagnostic suggestion.

When compiling with warnings turned on, there is no visual output suggesting whether or not that warning is ignored or enforced as an error:


ie:
int main()
{
    return 0;
    return 1;
}

$ dmd test.d -w
test.d(4): Warning: statement is not reachable
$ dmd test.d -wi
test.d(4): Warning: statement is not reachable


Would be handy if confronted with a notification that warnings are being treated as errors by the compiler.

This small addition to vwarning has a nice effect:

     {
         char *p = loc.toChars();
 
+        if (global.params.warnings == 1)
+            fprintf(stdmsg, "%s: warnings being treated as errors\n", global.params.argv0);
+
         if (*p)
             fprintf(stdmsg, "%s: ", p);
         mem.free(p);



$ dmd test.d -w
dmd: warnings being treated as errors
test.d(4): Warning: statement is not reachable
$ dmd test.d -wi
test.d(4): Warning: statement is not reachable


Regards