=== tests/cases/compiler/switchFallThroughs.ts ===
function R1(index: number) {
>R1 : (index: number) => string
>index : number

    switch (index) {
>index : number

        case 0:
        case 1:
        case 2:
            var a = 'a';
>a : string

            return a;
>a : string

        case 3:
        case 4: {
            return 'b';
        }
		case 5:
		default:
			return 'c';
    }
}