t.Fatal("Node failed:", err)
	}

	diff(t, buf.Bytes(), src)
}

// Node is documented to not modify the AST.
// Test that it is so even when numbers are normalized.
func TestNodeNoModify(t *testing.T) {
	const (
		src    = "package p\n\nconst _ = 0000000123i\n"
		golden = "package p\n\nconst _ = 123i\n"
	)

	fset := token.NewFileSet()