bestCommonTypeOfTuple.types

=== tests/cases/conformance/types/typeRelationships/bestCommonType/bestCommonTypeOfTuple.ts ===
function f1(x: number): string { return "foo"; }
>f1 : (x: number) => string
>x : number
>"foo" : "foo"

function f2(x: number): number { return 10; }
>f2 : (x: number) => number
>x : number
>10 : 10

function f3(x: number): boolean { return true; }
>f3 : (x: number) => boolean
>x : number
>true : true

enum E1 { one }
>E1 : E1
>one : E1

enum E2 { two }
>E2 : E2
>two : E2


var t1: [(x: number) => string, (x: number) => number];
>t1 : [(x: number) => string, (x: number) => number]
>x : number
>x : number

var t2: [E1, E2];
>t2 : [E1, E2]
>E1 : E1
>E2 : E2

var t3: [number, any];
>t3 : [number, any]

var t4: [E1, E2, number];
>t4 : [E1, E2, number]
>E1 : E1
>E2 : E2

// no error
t1 = [f1, f2];
>t1 = [f1, f2] : [(x: number) => string, (x: number) => number]
>t1 : [(x: number) => string, (x: number) => number]
>[f1, f2] : [(x: number) => string, (x: number) => number]
>f1 : (x: number) => string
>f2 : (x: number) => number

t2 = [E1.one, E2.two];
>t2 = [E1.one, E2.two] : [E1, E2]
>t2 : [E1, E2]
>[E1.one, E2.two] : [E1, E2]
>E1.one : E1
>E1 : typeof E1
>one : E1
>E2.two : E2
>E2 : typeof E2
>two : E2

t3 = [5, undefined];
>t3 = [5, undefined] : [number, undefined]
>t3 : [number, any]
>[5, undefined] : [number, undefined]
>5 : 5
>undefined : undefined

t4 = [E1.one, E2.two, 20];
>t4 = [E1.one, E2.two, 20] : [E1, E2, number]
>t4 : [E1, E2, number]
>[E1.one, E2.two, 20] : [E1, E2, number]
>E1.one : E1
>E1 : typeof E1
>one : E1
>E2.two : E2
>E2 : typeof E2
>two : E2
>20 : 20

var e1 = t1[2];  // {}
>e1 : ((x: number) => string) | ((x: number) => number)
>t1[2] : ((x: number) => string) | ((x: number) => number)
>t1 : [(x: number) => string, (x: number) => number]
>2 : 2

var e2 = t2[2];  // {}
>e2 : E1 | E2
>t2[2] : E1 | E2
>t2 : [E1, E2]
>2 : 2

var e3 = t3[2];  // any
>e3 : any
>t3[2] : any
>t3 : [number, any]
>2 : 2

var e4 = t4[3];  // number
>e4 : number
>t4[3] : number
>t4 : [E1, E2, number]
>3 : 3