--- /n/sources/plan9/sys/src/libc/port/_assert.c	Sat Jan 10 10:00:05 2015
+++ /sys/src/libc/port/_assert.c	Sun Jun 28 00:00:00 2026
@@ -8,6 +8,6 @@ _assert(char *s)
 {
 	if(__assert)
 		(*__assert)(s);
-	fprint(2, "assert failed: %s\n", s);
+	fprint(2, "assert failed, called from %#p: %s\n", getcallerpc(&s), s);
 	abort();
 }