return nil
	}

	// The generated 'testmain' package is allowed to access testing/internal/...,
	// as if it were generated into the testing directory tree
	// (it's actually in a temporary directory outside any Go tree).
	// This cleans up a former kludge in passing functionality to the testing package.
	if str.HasPathPrefix(p.ImportPath, "testing/internal") && importerPath == "testmain" {
		return nil
	}

// allowed to install a.Target.
//
// The build of cmd/go running under its own test is forbidden from installing
// to its original GOROOT. The var is exported so it can be set by TestMain.
var AllowInstall = func(*Action) error { return nil }

// cleanup removes a's object dir to keep the amount of
// on-disk garbage down in a large build. On an operating system

		t.Errorf("mbig.MapIndex(\"hello\") for nil map = %v, want Invalid Value", x)
	}

	// Test that deletes from a nil map succeed.
	mv.SetMapIndex(ValueOf("hi"), Value{})
}

func TestChan(t *testing.T) {
	for loop := 0; loop < 2; loop++ {
		var c chan int
		var cv Value

		// check both ways to allocate channels
		switch loop {
		case 1:
			c = make(chan int, 1)