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

    switch (index) {
>index : number

        case 0:
>0 : number

        case 1:
>1 : number

        case 2:
>2 : number

            var a = 'a';
>a : string
>'a' : string

            return a;
>a : string

        case 3:
>3 : number

        case 4: {
>4 : number

            return 'b';
>'b' : string
        }
		case 5:
>5 : number

		default:
			return 'c';
>'c' : string
    }
}