=== tests/cases/compiler/reachabilityChecks4.ts ===
function foo(x, y) {
>foo : (x: any, y: any) => 1 | 2 | 3
>x : any
>y : any

    switch (x) {
>x : any

        case 1:
>1 : 1

        case 2:
>2 : 2

            return 1;
>1 : 1

        case 3:
>3 : 3

            if (y) {
>y : any

                return 2;
>2 : 2
            }
        case 4:
>4 : 4

            return 3;
>3 : 3
    }
}

declare function noop(): void;
>noop : () => void

declare function fail(): never;
>fail : () => never

function f1(x: 0 | 1 | 2) {
>f1 : (x: 0 | 1 | 2) => void
>x : 0 | 1 | 2

    switch (x) {
>x : 0 | 1 | 2

        case 0:
>0 : 0

            fail();
>fail() : never
>fail : () => never

        case 1:
>1 : 1

            noop();
>noop() : void
>noop : () => void

        case 2:
>2 : 2

            return;
    }
}

// Repro from #34021

type Behavior = 'SLIDE' | 'SLIDE_OUT'
>Behavior : Behavior

type Direction = 'LEFT' | 'RIGHT' | 'TOP' | 'BOTTOM'
>Direction : Direction

interface Transition {
  behavior: Behavior
>behavior : Behavior

  direction: Direction
>direction : Direction
}

function f2(transition: Transition): any {
>f2 : (transition: Transition) => any
>transition : Transition

    switch (transition.behavior) {
>transition.behavior : Behavior
>transition : Transition
>behavior : Behavior

        case 'SLIDE':
>'SLIDE' : "SLIDE"

            switch (transition.direction) {
>transition.direction : Direction
>transition : Transition
>direction : Direction

                case 'LEFT':
>'LEFT' : "LEFT"

                    return []
>[] : undefined[]

                case 'RIGHT':
>'RIGHT' : "RIGHT"

                    return []
>[] : undefined[]

                case 'TOP':
>'TOP' : "TOP"

                    return []
>[] : undefined[]

                case 'BOTTOM':
>'BOTTOM' : "BOTTOM"

                    return []
>[] : undefined[]
            }
        case 'SLIDE_OUT':
>'SLIDE_OUT' : "SLIDE_OUT"

            switch (transition.direction) {
>transition.direction : Direction
>transition : Transition
>direction : Direction

                case 'LEFT':
>'LEFT' : "LEFT"

                    return []
>[] : undefined[]

                case 'RIGHT':
>'RIGHT' : "RIGHT"

                    return []
>[] : undefined[]

                case 'TOP':
>'TOP' : "TOP"

                    return []
>[] : undefined[]

                case 'BOTTOM':
>'BOTTOM' : "BOTTOM"

                    return []
>[] : undefined[]
            }
    }
}