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/compos.go b/test/compos.go
index 65aca4f..de688b3 100644
--- a/test/compos.go
+++ b/test/compos.go
@@ -4,6 +4,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
+// Test that returning &T{} from a function causes an allocation.
+
package main
type T struct {
