-extern void fatal (const char *format, ...)
- __attribute__ ((__format__ (__printf__, 1, 2)));
+/* Generate a message aligned by an indent.
+ When *indent == 0, assign message's indent to *indent,
+ When *indent > 0, align the message by *indent value. */
+void complain_at_indent (location loc, unsigned *indent,
+ char const *format, ...)
+ __attribute__ ((__format__ (__printf__, 3, 4)));