You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: negative_tests.go
    path of file: ./repos/go-critic/checkers/testdata/preferDecodeRune
    
    the code of the file until where you have to start completion: package checke
    
func good() {
	{
		r := []uint64{10}
		_ = r[0]
		r2 := []rune{10, 12, 34}
		_ = r2[0]
	}

	{
		// OK: 'runes' is not string-typed.
		var runes []rune
		_ = []rune(runes)[0]
	}

	{
		// OK: not a 0 index.
		var s string
		_ = []rune(s)[1]
	}

	{
		// OK: let's allow using int32 for now?
		//
		// We could add a []int32($x) pattern, but it should
		// probably be a concern of other checker that would suggest
		// using rune type here if the context implies the rune type.
		// And when the type is changed to 'rune', we could report
		// preferDecodeRune in a more meaningful way.
		var s string
		_ = []int32(s)[0]
	}
}