single argument panic

note that sortmain.go has been run through hg gofmt;
only the formatting of the day initializers changed.
i'm happy to revert that formatting if you'd prefer.

stop on error in doc/progs/run

R=r
CC=golang-dev
https://golang.org/cl/850041
diff --git a/test/fixedbugs/bug244.go b/test/fixedbugs/bug244.go
index 26db787..915c3fc 100644
--- a/test/fixedbugs/bug244.go
+++ b/test/fixedbugs/bug244.go
@@ -25,6 +25,7 @@
 
 func main() {
 	if x != 1 || y != 2 || z != 3 || nf != 1 || v != 0 || ok != false || ng != 1 {
-		panic("x=", x, " y=", y, " z=", z, " nf=", nf, " v=", v, " ok=", ok, " ng=", ng)
+		println("x=", x, " y=", y, " z=", z, " nf=", nf, " v=", v, " ok=", ok, " ng=", ng)
+		panic("fail")
 	}
 }