=== tests/cases/conformance/types/union/contextualTypeWithUnionTypeIndexSignatures.ts ===
//When used as a contextual type, a union type U has those members that are present in any of 
// its constituent types, with types that are unions of the respective members in the constituent types. 
interface SomeType {
>SomeType : Symbol(SomeType, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 0, 0))

    (a: number): number;
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 3, 5))
}
interface SomeType2 {
>SomeType2 : Symbol(SomeType2, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 4, 1))

    (a: number): string;
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 6, 5))
}

interface IWithNoStringIndexSignature {
>IWithNoStringIndexSignature : Symbol(IWithNoStringIndexSignature, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 7, 1))

    foo: string;
>foo : Symbol(foo, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 9, 39))
}
interface IWithNoNumberIndexSignature {
>IWithNoNumberIndexSignature : Symbol(IWithNoNumberIndexSignature, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 11, 1))

    0: string;
}
interface IWithStringIndexSignature1 {
>IWithStringIndexSignature1 : Symbol(IWithStringIndexSignature1, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 14, 1))

    [a: string]: SomeType;
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 16, 5))
>SomeType : Symbol(SomeType, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 0, 0))
}
interface IWithStringIndexSignature2 {
>IWithStringIndexSignature2 : Symbol(IWithStringIndexSignature2, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 17, 1))

    [a: string]: SomeType2;
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 19, 5))
>SomeType2 : Symbol(SomeType2, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 4, 1))
}
interface IWithNumberIndexSignature1 {
>IWithNumberIndexSignature1 : Symbol(IWithNumberIndexSignature1, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 20, 1))

    [a: number]: SomeType;
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 22, 5))
>SomeType : Symbol(SomeType, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 0, 0))
}
interface IWithNumberIndexSignature2 {
>IWithNumberIndexSignature2 : Symbol(IWithNumberIndexSignature2, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 23, 1))

    [a: number]: SomeType2;
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 25, 5))
>SomeType2 : Symbol(SomeType2, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 4, 1))
}

// When an object literal is contextually typed by a type that includes a string index signature, 
// the resulting type of the object literal includes a string index signature with the union type of 
// the types of the properties declared in the object literal, or the Undefined type if the object literal 
// is empty.Likewise, when an object literal is contextually typed by a type that includes a numeric index 
// signature, the resulting type of the object literal includes a numeric index signature with the union type
// of the types of the numerically named properties(section 3.7.4) declared in the object literal, 
// or the Undefined type if the object literal declares no numerically named properties.

// Let S be the set of types in U that has a string index signature.
// If S is not empty, U has a string index signature of a union type of 
// the types of the string index signatures from each type in S.
var x: IWithNoStringIndexSignature | IWithStringIndexSignature1 = { z: a => a }; // a should be number
>x : Symbol(x, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 39, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 40, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 41, 3))
>IWithNoStringIndexSignature : Symbol(IWithNoStringIndexSignature, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 7, 1))
>IWithStringIndexSignature1 : Symbol(IWithStringIndexSignature1, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 14, 1))
>z : Symbol(z, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 39, 67))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 39, 70))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 39, 70))

var x: IWithNoStringIndexSignature | IWithStringIndexSignature1 = { foo: a => a }; // a should be any
>x : Symbol(x, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 39, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 40, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 41, 3))
>IWithNoStringIndexSignature : Symbol(IWithNoStringIndexSignature, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 7, 1))
>IWithStringIndexSignature1 : Symbol(IWithStringIndexSignature1, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 14, 1))
>foo : Symbol(foo, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 40, 67))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 40, 72))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 40, 72))

var x: IWithNoStringIndexSignature | IWithStringIndexSignature1 = { foo: "hello" }; 
>x : Symbol(x, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 39, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 40, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 41, 3))
>IWithNoStringIndexSignature : Symbol(IWithNoStringIndexSignature, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 7, 1))
>IWithStringIndexSignature1 : Symbol(IWithStringIndexSignature1, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 14, 1))
>foo : Symbol(foo, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 41, 67))

var x2: IWithStringIndexSignature1 | IWithStringIndexSignature2 = { z: a => a.toString() }; // a should be number
>x2 : Symbol(x2, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 42, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 43, 3))
>IWithStringIndexSignature1 : Symbol(IWithStringIndexSignature1, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 14, 1))
>IWithStringIndexSignature2 : Symbol(IWithStringIndexSignature2, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 17, 1))
>z : Symbol(z, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 42, 67))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 42, 70))
>a.toString : Symbol(Number.toString, Decl(lib.d.ts, 458, 18))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 42, 70))
>toString : Symbol(Number.toString, Decl(lib.d.ts, 458, 18))

var x2: IWithStringIndexSignature1 | IWithStringIndexSignature2 = { z: a => a }; // a should be number
>x2 : Symbol(x2, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 42, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 43, 3))
>IWithStringIndexSignature1 : Symbol(IWithStringIndexSignature1, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 14, 1))
>IWithStringIndexSignature2 : Symbol(IWithStringIndexSignature2, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 17, 1))
>z : Symbol(z, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 43, 67))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 43, 70))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 43, 70))


// Let S be the set of types in U that has a numeric index signature.
// If S is not empty, U has a numeric index signature of a union type of 
// the types of the numeric index signatures from each type in S.
var x3: IWithNoNumberIndexSignature | IWithNumberIndexSignature1 = { 1: a => a }; // a should be number
>x3 : Symbol(x3, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 49, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 50, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 51, 3))
>IWithNoNumberIndexSignature : Symbol(IWithNoNumberIndexSignature, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 11, 1))
>IWithNumberIndexSignature1 : Symbol(IWithNumberIndexSignature1, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 20, 1))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 49, 71))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 49, 71))

var x3: IWithNoNumberIndexSignature | IWithNumberIndexSignature1 = { 0: a => a }; // a should be any
>x3 : Symbol(x3, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 49, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 50, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 51, 3))
>IWithNoNumberIndexSignature : Symbol(IWithNoNumberIndexSignature, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 11, 1))
>IWithNumberIndexSignature1 : Symbol(IWithNumberIndexSignature1, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 20, 1))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 50, 71))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 50, 71))

var x3: IWithNoNumberIndexSignature | IWithNumberIndexSignature1 = { 0: "hello" };
>x3 : Symbol(x3, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 49, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 50, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 51, 3))
>IWithNoNumberIndexSignature : Symbol(IWithNoNumberIndexSignature, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 11, 1))
>IWithNumberIndexSignature1 : Symbol(IWithNumberIndexSignature1, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 20, 1))

var x4: IWithNumberIndexSignature1 | IWithNumberIndexSignature2 = { 1: a => a.toString() }; // a should be number
>x4 : Symbol(x4, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 52, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 53, 3))
>IWithNumberIndexSignature1 : Symbol(IWithNumberIndexSignature1, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 20, 1))
>IWithNumberIndexSignature2 : Symbol(IWithNumberIndexSignature2, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 23, 1))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 52, 70))
>a.toString : Symbol(Number.toString, Decl(lib.d.ts, 458, 18))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 52, 70))
>toString : Symbol(Number.toString, Decl(lib.d.ts, 458, 18))

var x4: IWithNumberIndexSignature1 | IWithNumberIndexSignature2 = { 1: a => a }; // a should be number
>x4 : Symbol(x4, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 52, 3), Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 53, 3))
>IWithNumberIndexSignature1 : Symbol(IWithNumberIndexSignature1, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 20, 1))
>IWithNumberIndexSignature2 : Symbol(IWithNumberIndexSignature2, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 23, 1))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 53, 70))
>a : Symbol(a, Decl(contextualTypeWithUnionTypeIndexSignatures.ts, 53, 70))