go/types: remove global vars in test

Change-Id: I5fb61a38362a40c706ba5cb8968c387c8dc4aef2
Reviewed-on: https://go-review.googlesource.com/10992
Reviewed-by: Alan Donovan <adonovan@google.com>

go/types/resolver_test.go

@@ -16,7 +16,10 @@ import (
 	. "golang.org/x/tools/go/types"
 )
 
-var sources = []string{
+func TestResolveIdents(t *testing.T) {
+	skipSpecialPlatforms(t)
+
+	sources := []string{
 		`
 		package p
 		import "fmt"
@@ -83,14 +86,11 @@ var sources = []string{
 		`,
 	}
 
-var pkgnames = []string{
+	pkgnames := []string{
 		"fmt",
 		"math",
 	}
 
-func TestResolveIdents(t *testing.T) {
-	skipSpecialPlatforms(t)
-
 	// parse package files
 	fset := token.NewFileSet()
 	var files []*ast.File