golang issue19977 代码
文件路径：/test/fixedbugs/issue19977.go
/ errorcheck
/ Copyright 2017 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.
/ Issue 19977: multiple error messages when type switching on an undefined
package foo
func Foo() {
switch x := a.(type) { / ERROR "undefined: a|reference to undefined name .*a"
default:
_ = x
}
}