[dev.go2go] go/go2go: accept slash in an instantiated type name

It shows up when instantiating with types with a package path
containing a slash, as in net/url.Error.

Fixes #39642

Change-Id: Icf40e7bcdf1de7c84f58ebde35ebffadbb071d72
Reviewed-on: https://go-review.googlesource.com/c/go/+/238623
Reviewed-by: Ian Lance Taylor <[email protected]>

Author: ianlancetaylor

src/go/go2go/names.go

@@ -33,8 +33,9 @@ var nameCodes = map[rune]int{
 	'.':       10,
 	'<':       11,
 	'-':       12,
-	nameSep:   13,
-	nameIntro: 14,
+	'/':       13,
+	nameSep:   14,
+	nameIntro: 15,
 }
 
 // instantiatedName returns the name of a newly instantiated function.

test/gen/g023.go2

@@ -0,0 +1,17 @@
+// compile
+
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+import "net/url"
+
+type S(type T) struct {
+	f T
+}
+
+func F() S(url.Error) {
+	return S(url.Error){}
+}