=== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/optionalPropertyAssignableToStringIndexSignature.ts ===
declare let optionalProperties: { k1?: string };
>optionalProperties : { k1?: string | undefined; }
>k1 : string | undefined

declare let undefinedProperties: { k1: string | undefined };
>undefinedProperties : { k1: string | undefined; }
>k1 : string | undefined

declare let stringDictionary: { [key: string]: string };
>stringDictionary : { [key: string]: string; }
>key : string

stringDictionary = optionalProperties;  // ok
>stringDictionary = optionalProperties : { k1?: string | undefined; }
>stringDictionary : { [key: string]: string; }
>optionalProperties : { k1?: string | undefined; }

stringDictionary = undefinedProperties; // error
>stringDictionary = undefinedProperties : { k1: string | undefined; }
>stringDictionary : { [key: string]: string; }
>undefinedProperties : { k1: string | undefined; }

declare let probablyArray: { [key: number]: string };
>probablyArray : { [key: number]: string; }
>key : number

declare let numberLiteralKeys: { 1?: string };
>numberLiteralKeys : { 1?: string | undefined; }
>1 : string | undefined

probablyArray = numberLiteralKeys;  // error
>probablyArray = numberLiteralKeys : { 1?: string | undefined; }
>probablyArray : { [key: number]: string; }
>numberLiteralKeys : { 1?: string | undefined; }

declare let optionalUndefined: { k1?: undefined };
>optionalUndefined : { k1?: undefined; }
>k1 : undefined

let dict: { [key: string]: string } = optionalUndefined; // error
>dict : { [key: string]: string; }
>key : string
>optionalUndefined : { k1?: undefined; }

function f<T>() {
>f : <T>() => void

	let optional: { k1?: T } = undefined!;
>optional : { k1?: T | undefined; }
>k1 : T | undefined
>undefined! : never
>undefined : undefined

	let dict: { [key: string]: T | number } = optional; // ok
>dict : { [key: string]: number | T; }
>key : string
>optional : { k1?: T | undefined; }
}