type switches: test for pathological case
R=rsc, r
CC=golang-dev
https://golang.org/cl/4894057
diff --git a/test/typeswitch2.go b/test/typeswitch2.go
index f8fe396..57c5a18 100644
--- a/test/typeswitch2.go
+++ b/test/typeswitch2.go
@@ -18,11 +18,27 @@
return "Reader1"
case io.Reader: // ERROR "duplicate"
return "Reader2"
- case interface { r(); w() }:
+ case interface {
+ r()
+ w()
+ }:
return "rw"
- case interface { w(); r() }: // ERROR "duplicate"
+ case interface {
+ w()
+ r()
+ }: // ERROR "duplicate"
return "wr"
-
+
}
return ""
}
+
+func notused(x interface{}) {
+ // The first t is in a different scope than the 2nd t; it cannot
+ // be accessed (=> declared and not used error); but it is legal
+ // to declare it.
+ switch t := 0; t := x.(type) { // ERROR "declared and not used"
+ case int:
+ _ = t // this is using the t of "t := x.(type)"
+ }
+}
