cmd/gc: Suggest *T in error for x.(T) if it would work.
Accomplished by synchronizing the formatting of conversion errors between typecheck.c and subr.c
Fixes #3984.
R=golang-dev, remyoudompheng, rsc
CC=golang-dev
https://golang.org/cl/6500064
diff --git a/test/interface/explicit.go b/test/interface/explicit.go
index 7822b88..eb81156 100644
--- a/test/interface/explicit.go
+++ b/test/interface/explicit.go
@@ -15,6 +15,10 @@
var t *T
+type X int
+
+func (x *X) M() {}
+
type I interface {
M()
}
@@ -66,6 +70,8 @@
var _ = m.(Int) // ERROR "impossible type assertion"
+var _ = m.(X) // ERROR "pointer receiver"
+
var ii int
var jj Int
