// 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 20185: type switching on untyped values (e.g. nil or consts) // caused an internal compiler error. package p func F() { switch t := nil.(type) { // ERROR "cannot type switch on non-interface value|not an interface" default: _ = t } } const x = 1 func G() { switch t := x.(type) { // ERROR "cannot type switch on non-interface value|declared and not used|not an interface" default: } }