TypeScript/tests/baselines/reference/heterogeneousArrayLiterals.types

=== tests/cases/conformance/types/typeRelationships/bestCommonType/heterogeneousArrayLiterals.ts ===
// type of an array is the best common type of its elements (plus its contextual type if it exists)

var a = [1, '']; // {}[]
>a : (string | number)[], Symbol(a, Decl(heterogeneousArrayLiterals.ts, 2, 3))
>[1, ''] : (string | number)[]
>1 : number
>'' : string

var b = [1, null]; // number[]
>b : number[], Symbol(b, Decl(heterogeneousArrayLiterals.ts, 3, 3))
>[1, null] : number[]
>1 : number
>null : null

var c = [1, '', null]; // {}[]
>c : (string | number)[], Symbol(c, Decl(heterogeneousArrayLiterals.ts, 4, 3))
>[1, '', null] : (string | number)[]
>1 : number
>'' : string
>null : null

var d = [{}, 1]; // {}[]
>d : {}[], Symbol(d, Decl(heterogeneousArrayLiterals.ts, 5, 3))
>[{}, 1] : {}[]
>{} : {}
>1 : number

var e = [{}, Object]; // {}[]
>e : {}[], Symbol(e, Decl(heterogeneousArrayLiterals.ts, 6, 3))
>[{}, Object] : {}[]
>{} : {}
>Object : ObjectConstructor, Symbol(Object, Decl(lib.d.ts, 92, 1), Decl(lib.d.ts, 223, 11))

var f = [[], [1]]; // number[][]
>f : number[][], Symbol(f, Decl(heterogeneousArrayLiterals.ts, 8, 3))
>[[], [1]] : number[][]
>[] : undefined[]
>[1] : number[]
>1 : number

var g = [[1], ['']]; // {}[]
>g : (string[] | number[])[], Symbol(g, Decl(heterogeneousArrayLiterals.ts, 9, 3))
>[[1], ['']] : (string[] | number[])[]
>[1] : number[]
>1 : number
>[''] : string[]
>'' : string

var h = [{ foo: 1, bar: '' }, { foo: 2 }]; // {foo: number}[]
>h : { foo: number; }[], Symbol(h, Decl(heterogeneousArrayLiterals.ts, 11, 3))
>[{ foo: 1, bar: '' }, { foo: 2 }] : { foo: number; }[]
>{ foo: 1, bar: '' } : { foo: number; bar: string; }
>foo : number, Symbol(foo, Decl(heterogeneousArrayLiterals.ts, 11, 10))
>1 : number
>bar : string, Symbol(bar, Decl(heterogeneousArrayLiterals.ts, 11, 18))
>'' : string
>{ foo: 2 } : { foo: number; }
>foo : number, Symbol(foo, Decl(heterogeneousArrayLiterals.ts, 11, 31))
>2 : number

var i = [{ foo: 1, bar: '' }, { foo: '' }]; // {}[]
>i : ({ foo: number; bar: string; } | { foo: string; })[], Symbol(i, Decl(heterogeneousArrayLiterals.ts, 12, 3))
>[{ foo: 1, bar: '' }, { foo: '' }] : ({ foo: number; bar: string; } | { foo: string; })[]
>{ foo: 1, bar: '' } : { foo: number; bar: string; }
>foo : number, Symbol(foo, Decl(heterogeneousArrayLiterals.ts, 12, 10))
>1 : number
>bar : string, Symbol(bar, Decl(heterogeneousArrayLiterals.ts, 12, 18))
>'' : string
>{ foo: '' } : { foo: string; }
>foo : string, Symbol(foo, Decl(heterogeneousArrayLiterals.ts, 12, 31))
>'' : string

var j = [() => 1, () => '']; // {}[]
>j : ((() => number) | (() => string))[], Symbol(j, Decl(heterogeneousArrayLiterals.ts, 14, 3))
>[() => 1, () => ''] : ((() => number) | (() => string))[]
>() => 1 : () => number
>1 : number
>() => '' : () => string
>'' : string

var k = [() => 1, () => 1]; // { (): number }[]
>k : (() => number)[], Symbol(k, Decl(heterogeneousArrayLiterals.ts, 15, 3))
>[() => 1, () => 1] : (() => number)[]
>() => 1 : () => number
>1 : number
>() => 1 : () => number
>1 : number

var l = [() => 1, () => null]; // { (): any }[]
>l : (() => any)[], Symbol(l, Decl(heterogeneousArrayLiterals.ts, 16, 3))
>[() => 1, () => null] : (() => any)[]
>() => 1 : () => number
>1 : number
>() => null : () => any
>null : null

var m = [() => 1, () => '', () => null]; // { (): any }[]
>m : (() => any)[], Symbol(m, Decl(heterogeneousArrayLiterals.ts, 17, 3))
>[() => 1, () => '', () => null] : (() => any)[]
>() => 1 : () => number
>1 : number
>() => '' : () => string
>'' : string
>() => null : () => any
>null : null

var n = [[() => 1], [() => '']]; // {}[]
>n : ((() => number)[] | (() => string)[])[], Symbol(n, Decl(heterogeneousArrayLiterals.ts, 18, 3))
>[[() => 1], [() => '']] : ((() => number)[] | (() => string)[])[]
>[() => 1] : (() => number)[]
>() => 1 : () => number
>1 : number
>[() => ''] : (() => string)[]
>() => '' : () => string
>'' : string

class Base { foo: string; }
>Base : Base, Symbol(Base, Decl(heterogeneousArrayLiterals.ts, 18, 32))
>foo : string, Symbol(foo, Decl(heterogeneousArrayLiterals.ts, 20, 12))

class Derived extends Base { bar: string; }
>Derived : Derived, Symbol(Derived, Decl(heterogeneousArrayLiterals.ts, 20, 27), Decl(heterogeneousArrayLiterals.ts, 25, 23))
>Base : Base, Symbol(Base, Decl(heterogeneousArrayLiterals.ts, 18, 32))
>bar : string, Symbol(bar, Decl(heterogeneousArrayLiterals.ts, 21, 28))

class Derived2 extends Base { baz: string; }
>Derived2 : Derived2, Symbol(Derived2, Decl(heterogeneousArrayLiterals.ts, 21, 43))
>Base : Base, Symbol(Base, Decl(heterogeneousArrayLiterals.ts, 18, 32))
>baz : string, Symbol(baz, Decl(heterogeneousArrayLiterals.ts, 22, 29))

var base: Base;
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))
>Base : Base, Symbol(Base, Decl(heterogeneousArrayLiterals.ts, 18, 32))

var derived: Derived;
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))
>Derived : Derived, Symbol(Derived, Decl(heterogeneousArrayLiterals.ts, 20, 27), Decl(heterogeneousArrayLiterals.ts, 25, 23))

var derived2: Derived2;
>derived2 : Derived2, Symbol(derived2, Decl(heterogeneousArrayLiterals.ts, 25, 3))
>Derived2 : Derived2, Symbol(Derived2, Decl(heterogeneousArrayLiterals.ts, 21, 43))

module Derived {
>Derived : typeof Derived, Symbol(Derived, Decl(heterogeneousArrayLiterals.ts, 20, 27), Decl(heterogeneousArrayLiterals.ts, 25, 23))

    var h = [{ foo: base, basear: derived }, { foo: base }]; // {foo: Base}[]
>h : { foo: Base; }[], Symbol(h, Decl(heterogeneousArrayLiterals.ts, 28, 7))
>[{ foo: base, basear: derived }, { foo: base }] : { foo: Base; }[]
>{ foo: base, basear: derived } : { foo: Base; basear: Derived; }
>foo : Base, Symbol(foo, Decl(heterogeneousArrayLiterals.ts, 28, 14))
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))
>basear : Derived, Symbol(basear, Decl(heterogeneousArrayLiterals.ts, 28, 25))
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))
>{ foo: base } : { foo: Base; }
>foo : Base, Symbol(foo, Decl(heterogeneousArrayLiterals.ts, 28, 46))
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))

    var i = [{ foo: base, basear: derived }, { foo: derived }]; // {foo: Derived}[]
>i : ({ foo: Base; basear: Derived; } | { foo: Derived; })[], Symbol(i, Decl(heterogeneousArrayLiterals.ts, 29, 7))
>[{ foo: base, basear: derived }, { foo: derived }] : ({ foo: Base; basear: Derived; } | { foo: Derived; })[]
>{ foo: base, basear: derived } : { foo: Base; basear: Derived; }
>foo : Base, Symbol(foo, Decl(heterogeneousArrayLiterals.ts, 29, 14))
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))
>basear : Derived, Symbol(basear, Decl(heterogeneousArrayLiterals.ts, 29, 25))
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))
>{ foo: derived } : { foo: Derived; }
>foo : Derived, Symbol(foo, Decl(heterogeneousArrayLiterals.ts, 29, 46))
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))

    var j = [() => base, () => derived]; // { {}: Base }
>j : (() => Base)[], Symbol(j, Decl(heterogeneousArrayLiterals.ts, 31, 7))
>[() => base, () => derived] : (() => Base)[]
>() => base : () => Base
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))
>() => derived : () => Derived
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))

    var k = [() => base, () => 1]; // {}[]~
>k : ((() => Base) | (() => number))[], Symbol(k, Decl(heterogeneousArrayLiterals.ts, 32, 7))
>[() => base, () => 1] : ((() => Base) | (() => number))[]
>() => base : () => Base
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))
>() => 1 : () => number
>1 : number

    var l = [() => base, () => null]; // { (): any }[]
>l : (() => any)[], Symbol(l, Decl(heterogeneousArrayLiterals.ts, 33, 7))
>[() => base, () => null] : (() => any)[]
>() => base : () => Base
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))
>() => null : () => any
>null : null

    var m = [() => base, () => derived, () => null]; // { (): any }[]
>m : (() => any)[], Symbol(m, Decl(heterogeneousArrayLiterals.ts, 34, 7))
>[() => base, () => derived, () => null] : (() => any)[]
>() => base : () => Base
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))
>() => derived : () => Derived
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))
>() => null : () => any
>null : null

    var n = [[() => base], [() => derived]]; // { (): Base }[]
>n : (() => Base)[][], Symbol(n, Decl(heterogeneousArrayLiterals.ts, 35, 7))
>[[() => base], [() => derived]] : (() => Base)[][]
>[() => base] : (() => Base)[]
>() => base : () => Base
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))
>[() => derived] : (() => Derived)[]
>() => derived : () => Derived
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))

    var o = [derived, derived2]; // {}[]
>o : (Derived | Derived2)[], Symbol(o, Decl(heterogeneousArrayLiterals.ts, 36, 7))
>[derived, derived2] : (Derived | Derived2)[]
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))
>derived2 : Derived2, Symbol(derived2, Decl(heterogeneousArrayLiterals.ts, 25, 3))

    var p = [derived, derived2, base]; // Base[]
>p : Base[], Symbol(p, Decl(heterogeneousArrayLiterals.ts, 37, 7))
>[derived, derived2, base] : Base[]
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))
>derived2 : Derived2, Symbol(derived2, Decl(heterogeneousArrayLiterals.ts, 25, 3))
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))

    var q = [[() => derived2], [() => derived]]; // {}[]
>q : ((() => Derived2)[] | (() => Derived)[])[], Symbol(q, Decl(heterogeneousArrayLiterals.ts, 38, 7))
>[[() => derived2], [() => derived]] : ((() => Derived2)[] | (() => Derived)[])[]
>[() => derived2] : (() => Derived2)[]
>() => derived2 : () => Derived2
>derived2 : Derived2, Symbol(derived2, Decl(heterogeneousArrayLiterals.ts, 25, 3))
>[() => derived] : (() => Derived)[]
>() => derived : () => Derived
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))
}

module WithContextualType {
>WithContextualType : typeof WithContextualType, Symbol(WithContextualType, Decl(heterogeneousArrayLiterals.ts, 39, 1))

    // no errors
    var a: Base[] = [derived, derived2];
>a : Base[], Symbol(a, Decl(heterogeneousArrayLiterals.ts, 43, 7))
>Base : Base, Symbol(Base, Decl(heterogeneousArrayLiterals.ts, 18, 32))
>[derived, derived2] : (Derived | Derived2)[]
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))
>derived2 : Derived2, Symbol(derived2, Decl(heterogeneousArrayLiterals.ts, 25, 3))

    var b: Derived[] = [null];
>b : Derived[], Symbol(b, Decl(heterogeneousArrayLiterals.ts, 44, 7))
>Derived : Derived, Symbol(Derived, Decl(heterogeneousArrayLiterals.ts, 20, 27), Decl(heterogeneousArrayLiterals.ts, 25, 23))
>[null] : null[]
>null : null

    var c: Derived[] = [];
>c : Derived[], Symbol(c, Decl(heterogeneousArrayLiterals.ts, 45, 7))
>Derived : Derived, Symbol(Derived, Decl(heterogeneousArrayLiterals.ts, 20, 27), Decl(heterogeneousArrayLiterals.ts, 25, 23))
>[] : undefined[]

    var d: { (): Base }[] = [() => derived, () => derived2];
>d : (() => Base)[], Symbol(d, Decl(heterogeneousArrayLiterals.ts, 46, 7))
>Base : Base, Symbol(Base, Decl(heterogeneousArrayLiterals.ts, 18, 32))
>[() => derived, () => derived2] : ((() => Derived) | (() => Derived2))[]
>() => derived : () => Derived
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))
>() => derived2 : () => Derived2
>derived2 : Derived2, Symbol(derived2, Decl(heterogeneousArrayLiterals.ts, 25, 3))
}

function foo<T, U>(t: T, u: U) {
>foo : <T, U>(t: T, u: U) => void, Symbol(foo, Decl(heterogeneousArrayLiterals.ts, 47, 1))
>T : T, Symbol(T, Decl(heterogeneousArrayLiterals.ts, 49, 13))
>U : U, Symbol(U, Decl(heterogeneousArrayLiterals.ts, 49, 15))
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 49, 19))
>T : T, Symbol(T, Decl(heterogeneousArrayLiterals.ts, 49, 13))
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 49, 24))
>U : U, Symbol(U, Decl(heterogeneousArrayLiterals.ts, 49, 15))

    var a = [t, t]; // T[]
>a : T[], Symbol(a, Decl(heterogeneousArrayLiterals.ts, 50, 7))
>[t, t] : T[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 49, 19))
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 49, 19))

    var b = [t, null]; // T[]
>b : T[], Symbol(b, Decl(heterogeneousArrayLiterals.ts, 51, 7))
>[t, null] : T[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 49, 19))
>null : null

    var c = [t, u]; // {}[]
>c : (T | U)[], Symbol(c, Decl(heterogeneousArrayLiterals.ts, 52, 7))
>[t, u] : (T | U)[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 49, 19))
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 49, 24))

    var d = [t, 1]; // {}[]
>d : (number | T)[], Symbol(d, Decl(heterogeneousArrayLiterals.ts, 53, 7))
>[t, 1] : (number | T)[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 49, 19))
>1 : number

    var e = [() => t, () => u]; // {}[]
>e : ((() => T) | (() => U))[], Symbol(e, Decl(heterogeneousArrayLiterals.ts, 54, 7))
>[() => t, () => u] : ((() => T) | (() => U))[]
>() => t : () => T
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 49, 19))
>() => u : () => U
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 49, 24))

    var f = [() => t, () => u, () => null]; // { (): any }[]
>f : (() => any)[], Symbol(f, Decl(heterogeneousArrayLiterals.ts, 55, 7))
>[() => t, () => u, () => null] : (() => any)[]
>() => t : () => T
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 49, 19))
>() => u : () => U
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 49, 24))
>() => null : () => any
>null : null
}

function foo2<T extends Base, U extends Derived>(t: T, u: U) {
>foo2 : <T extends Base, U extends Derived>(t: T, u: U) => void, Symbol(foo2, Decl(heterogeneousArrayLiterals.ts, 56, 1))
>T : T, Symbol(T, Decl(heterogeneousArrayLiterals.ts, 58, 14))
>Base : Base, Symbol(Base, Decl(heterogeneousArrayLiterals.ts, 18, 32))
>U : U, Symbol(U, Decl(heterogeneousArrayLiterals.ts, 58, 29))
>Derived : Derived, Symbol(Derived, Decl(heterogeneousArrayLiterals.ts, 20, 27), Decl(heterogeneousArrayLiterals.ts, 25, 23))
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 58, 49))
>T : T, Symbol(T, Decl(heterogeneousArrayLiterals.ts, 58, 14))
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 58, 54))
>U : U, Symbol(U, Decl(heterogeneousArrayLiterals.ts, 58, 29))

    var a = [t, t]; // T[]
>a : T[], Symbol(a, Decl(heterogeneousArrayLiterals.ts, 59, 7))
>[t, t] : T[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 58, 49))
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 58, 49))

    var b = [t, null]; // T[]
>b : T[], Symbol(b, Decl(heterogeneousArrayLiterals.ts, 60, 7))
>[t, null] : T[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 58, 49))
>null : null

    var c = [t, u]; // {}[]
>c : (T | U)[], Symbol(c, Decl(heterogeneousArrayLiterals.ts, 61, 7))
>[t, u] : (T | U)[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 58, 49))
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 58, 54))

    var d = [t, 1]; // {}[]
>d : (number | T)[], Symbol(d, Decl(heterogeneousArrayLiterals.ts, 62, 7))
>[t, 1] : (number | T)[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 58, 49))
>1 : number

    var e = [() => t, () => u]; // {}[]
>e : ((() => T) | (() => U))[], Symbol(e, Decl(heterogeneousArrayLiterals.ts, 63, 7))
>[() => t, () => u] : ((() => T) | (() => U))[]
>() => t : () => T
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 58, 49))
>() => u : () => U
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 58, 54))

    var f = [() => t, () => u, () => null]; // { (): any }[]
>f : (() => any)[], Symbol(f, Decl(heterogeneousArrayLiterals.ts, 64, 7))
>[() => t, () => u, () => null] : (() => any)[]
>() => t : () => T
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 58, 49))
>() => u : () => U
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 58, 54))
>() => null : () => any
>null : null

    var g = [t, base]; // Base[]
>g : Base[], Symbol(g, Decl(heterogeneousArrayLiterals.ts, 66, 7))
>[t, base] : Base[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 58, 49))
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))

    var h = [t, derived]; // Derived[]
>h : (Derived | T)[], Symbol(h, Decl(heterogeneousArrayLiterals.ts, 67, 7))
>[t, derived] : (Derived | T)[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 58, 49))
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))

    var i = [u, base]; // Base[]
>i : Base[], Symbol(i, Decl(heterogeneousArrayLiterals.ts, 68, 7))
>[u, base] : Base[]
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 58, 54))
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))

    var j = [u, derived]; // Derived[]
>j : Derived[], Symbol(j, Decl(heterogeneousArrayLiterals.ts, 69, 7))
>[u, derived] : Derived[]
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 58, 54))
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))
}

function foo3<T extends Derived, U extends Derived>(t: T, u: U) {
>foo3 : <T extends Derived, U extends Derived>(t: T, u: U) => void, Symbol(foo3, Decl(heterogeneousArrayLiterals.ts, 70, 1))
>T : T, Symbol(T, Decl(heterogeneousArrayLiterals.ts, 72, 14))
>Derived : Derived, Symbol(Derived, Decl(heterogeneousArrayLiterals.ts, 20, 27), Decl(heterogeneousArrayLiterals.ts, 25, 23))
>U : U, Symbol(U, Decl(heterogeneousArrayLiterals.ts, 72, 32))
>Derived : Derived, Symbol(Derived, Decl(heterogeneousArrayLiterals.ts, 20, 27), Decl(heterogeneousArrayLiterals.ts, 25, 23))
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 72, 52))
>T : T, Symbol(T, Decl(heterogeneousArrayLiterals.ts, 72, 14))
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 72, 57))
>U : U, Symbol(U, Decl(heterogeneousArrayLiterals.ts, 72, 32))

    var a = [t, t]; // T[]
>a : T[], Symbol(a, Decl(heterogeneousArrayLiterals.ts, 73, 7))
>[t, t] : T[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 72, 52))
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 72, 52))

    var b = [t, null]; // T[]
>b : T[], Symbol(b, Decl(heterogeneousArrayLiterals.ts, 74, 7))
>[t, null] : T[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 72, 52))
>null : null

    var c = [t, u]; // {}[]
>c : (T | U)[], Symbol(c, Decl(heterogeneousArrayLiterals.ts, 75, 7))
>[t, u] : (T | U)[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 72, 52))
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 72, 57))

    var d = [t, 1]; // {}[]
>d : (number | T)[], Symbol(d, Decl(heterogeneousArrayLiterals.ts, 76, 7))
>[t, 1] : (number | T)[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 72, 52))
>1 : number

    var e = [() => t, () => u]; // {}[]
>e : ((() => T) | (() => U))[], Symbol(e, Decl(heterogeneousArrayLiterals.ts, 77, 7))
>[() => t, () => u] : ((() => T) | (() => U))[]
>() => t : () => T
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 72, 52))
>() => u : () => U
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 72, 57))

    var f = [() => t, () => u, () => null]; // { (): any }[]
>f : (() => any)[], Symbol(f, Decl(heterogeneousArrayLiterals.ts, 78, 7))
>[() => t, () => u, () => null] : (() => any)[]
>() => t : () => T
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 72, 52))
>() => u : () => U
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 72, 57))
>() => null : () => any
>null : null

    var g = [t, base]; // Base[]
>g : Base[], Symbol(g, Decl(heterogeneousArrayLiterals.ts, 80, 7))
>[t, base] : Base[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 72, 52))
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))

    var h = [t, derived]; // Derived[]
>h : Derived[], Symbol(h, Decl(heterogeneousArrayLiterals.ts, 81, 7))
>[t, derived] : Derived[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 72, 52))
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))

    var i = [u, base]; // Base[]
>i : Base[], Symbol(i, Decl(heterogeneousArrayLiterals.ts, 82, 7))
>[u, base] : Base[]
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 72, 57))
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))

    var j = [u, derived]; // Derived[]
>j : Derived[], Symbol(j, Decl(heterogeneousArrayLiterals.ts, 83, 7))
>[u, derived] : Derived[]
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 72, 57))
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))
}

function foo4<T extends Base, U extends Base>(t: T, u: U) {
>foo4 : <T extends Base, U extends Base>(t: T, u: U) => void, Symbol(foo4, Decl(heterogeneousArrayLiterals.ts, 84, 1))
>T : T, Symbol(T, Decl(heterogeneousArrayLiterals.ts, 86, 14))
>Base : Base, Symbol(Base, Decl(heterogeneousArrayLiterals.ts, 18, 32))
>U : U, Symbol(U, Decl(heterogeneousArrayLiterals.ts, 86, 29))
>Base : Base, Symbol(Base, Decl(heterogeneousArrayLiterals.ts, 18, 32))
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 86, 46))
>T : T, Symbol(T, Decl(heterogeneousArrayLiterals.ts, 86, 14))
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 86, 51))
>U : U, Symbol(U, Decl(heterogeneousArrayLiterals.ts, 86, 29))

    var a = [t, t]; // T[]
>a : T[], Symbol(a, Decl(heterogeneousArrayLiterals.ts, 87, 7))
>[t, t] : T[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 86, 46))
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 86, 46))

    var b = [t, null]; // T[]
>b : T[], Symbol(b, Decl(heterogeneousArrayLiterals.ts, 88, 7))
>[t, null] : T[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 86, 46))
>null : null

    var c = [t, u]; // BUG 821629
>c : (T | U)[], Symbol(c, Decl(heterogeneousArrayLiterals.ts, 89, 7))
>[t, u] : (T | U)[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 86, 46))
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 86, 51))

    var d = [t, 1]; // {}[]
>d : (number | T)[], Symbol(d, Decl(heterogeneousArrayLiterals.ts, 90, 7))
>[t, 1] : (number | T)[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 86, 46))
>1 : number

    var e = [() => t, () => u]; // {}[]
>e : ((() => T) | (() => U))[], Symbol(e, Decl(heterogeneousArrayLiterals.ts, 91, 7))
>[() => t, () => u] : ((() => T) | (() => U))[]
>() => t : () => T
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 86, 46))
>() => u : () => U
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 86, 51))

    var f = [() => t, () => u, () => null]; // { (): any }[]
>f : (() => any)[], Symbol(f, Decl(heterogeneousArrayLiterals.ts, 92, 7))
>[() => t, () => u, () => null] : (() => any)[]
>() => t : () => T
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 86, 46))
>() => u : () => U
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 86, 51))
>() => null : () => any
>null : null

    var g = [t, base]; // Base[]
>g : Base[], Symbol(g, Decl(heterogeneousArrayLiterals.ts, 94, 7))
>[t, base] : Base[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 86, 46))
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))

    var h = [t, derived]; // Derived[]
>h : (Derived | T)[], Symbol(h, Decl(heterogeneousArrayLiterals.ts, 95, 7))
>[t, derived] : (Derived | T)[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 86, 46))
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))

    var i = [u, base]; // Base[]
>i : Base[], Symbol(i, Decl(heterogeneousArrayLiterals.ts, 96, 7))
>[u, base] : Base[]
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 86, 51))
>base : Base, Symbol(base, Decl(heterogeneousArrayLiterals.ts, 23, 3))

    var j = [u, derived]; // Derived[]
>j : (Derived | U)[], Symbol(j, Decl(heterogeneousArrayLiterals.ts, 97, 7))
>[u, derived] : (Derived | U)[]
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 86, 51))
>derived : Derived, Symbol(derived, Decl(heterogeneousArrayLiterals.ts, 24, 3))

    var k: Base[] = [t, u];
>k : Base[], Symbol(k, Decl(heterogeneousArrayLiterals.ts, 99, 7))
>Base : Base, Symbol(Base, Decl(heterogeneousArrayLiterals.ts, 18, 32))
>[t, u] : (T | U)[]
>t : T, Symbol(t, Decl(heterogeneousArrayLiterals.ts, 86, 46))
>u : U, Symbol(u, Decl(heterogeneousArrayLiterals.ts, 86, 51))
}

//function foo3<T extends U, U extends Derived>(t: T, u: U) {
//    var a = [t, t]; // T[]
//    var b = [t, null]; // T[]
//    var c = [t, u]; // {}[]
//    var d = [t, 1]; // {}[]
//    var e = [() => t, () => u]; // {}[]
//    var f = [() => t, () => u, () => null]; // { (): any }[]

//    var g = [t, base]; // Base[]
//    var h = [t, derived]; // Derived[]
//    var i = [u, base]; // Base[]
//    var j = [u, derived]; // Derived[]
//}

//function foo4<T extends U, U extends Base>(t: T, u: U) {
//    var a = [t, t]; // T[]
//    var b = [t, null]; // T[]
//    var c = [t, u]; // BUG 821629
//    var d = [t, 1]; // {}[]
//    var e = [() => t, () => u]; // {}[]
//    var f = [() => t, () => u, () => null]; // { (): any }[]

//    var g = [t, base]; // Base[]
//    var h = [t, derived]; // Derived[]
//    var i = [u, base]; // Base[]
//    var j = [u, derived]; // Derived[]

//    var k: Base[] = [t, u];
//}