test/alias.go: additional tests

R=ken2
CC=golang-dev
https://golang.org/cl/5327045

1 files changed, 17 insertions, 1 deletions

diff --git a/test/alias.go b/test/alias.go
index 6039b3183f..199c782d00 100644
--- a/test/alias.go
+++ b/test/alias.go
@@ -9,11 +9,27 @@ package main
 // Test that error messages say what the source file says
 // (uint8 vs byte).
 
+import (
+	"fmt"
+	"utf8"
+)
+
 func f(byte) {}
 func g(uint8) {}
 
 func main() {
-	var x int
+	var x float64
 	f(x)  // ERROR "byte"
 	g(x)  // ERROR "uint8"
+
+	// Test across imports.
+
+	var ff fmt.Formatter
+	var fs fmt.State
+	ff.Format(fs, x)  // ERROR "rune"
+
+	utf8.RuneStart(x)  // ERROR "byte"
+
+	var s utf8.String
+	s.At(x)  // ERROR "int"
 }