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cmd/compile: add test for non interface type switch

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Ensure that we have a test for when the compiler
encounters a type switch on a non-interface value.

Change-Id: Icb222f986894d0190e1241ca65396b4950e7d14f
Reviewed-on: https://go-review.googlesource.com/38661
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Emmanuel Odeke 2017-03-25 16:17:59 -06:00 committed by Josh Bleecher Snyder
parent 783f166e65
commit e76d6a456b
1 changed files with 21 additions and 8 deletions
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29
test/typeswitch3.go
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@ -18,26 +18,39 @@ type I interface {
M() M()
} }
func main(){ func main() {
var x I var x I
switch x.(type) { switch x.(type) {
case string: // ERROR "impossible" case string: // ERROR "impossible"
println("FAIL") println("FAIL")
} }
// Issue 2700: if the case type is an interface, nothing is impossible // Issue 2700: if the case type is an interface, nothing is impossible
var r io.Reader var r io.Reader
_, _ = r.(io.Writer) _, _ = r.(io.Writer)
switch r.(type) { switch r.(type) {
case io.Writer: case io.Writer:
} }
// Issue 2827. // Issue 2827.
switch _ := r.(type) { // ERROR "invalid variable name _|no new variables" switch _ := r.(type) { // ERROR "invalid variable name _|no new variables"
} }
} }
func noninterface() {
var i int
switch i.(type) { // ERROR "cannot type switch on non-interface value"
case string:
case int:
}
type S struct {
name string
}
var s S
switch s.(type) { // ERROR "cannot type switch on non-interface value"
}
}