{"var X int; var Y int", true},
		{"var X int; var Y string", false},

		// TODO: add more tests for complex types.

		// Named types.
		{"type X int; type Y int", false},

		// Aliases.
		{"type X = int; type Y = int", true},

		// Functions.
		{`func X(int) string { return "" }; func Y(int) string { return "" }`, true},
		{`func X() string { return "" }; func Y(int) string { return "" }`, false},

// #defines that gcc encountered while processing the input
// and its included files.
func (p *Package) gccDefines(stdin []byte) string {
	base := append(gccBaseCmd, "-E", "-dM", "-xc")
	base = append(base, p.gccMachine()...)
	stdout, _ := runGcc(stdin, append(append(base, p.GccOptions...), "-"))
	return stdout
}

// gccErrors runs gcc over the C program stdin and returns