test: [a-c]: add introductory comments to tests
Very few of the compiler regression tests include a comment
saying waht they do. Many are obvious, some are anything but.
I've started with a-c in the top directory. More will follow once
we agree on the approach, correctness, and thoroughness here.
zerodivide.go sneaked in too.
R=rsc, r
CC=golang-dev
https://golang.org/cl/5656100
diff --git a/test/append.go b/test/append.go
index 6f35398..3f6251e 100644
--- a/test/append.go
+++ b/test/append.go
@@ -4,7 +4,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
-// Semi-exhaustive test for append()
+// Semi-exhaustive test for the append predeclared function.
package main
