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=== tests/cases/compiler/inferenceOptionalProperties.ts ===
declare function test<T>(x: { [key: string]: T }): T;
>test : <T>(x: { [key: string]: T; }) => T
>x : { [key: string]: T; }
>key : string
declare let x1: { a?: string, b?: number };
>x1 : { a?: string; b?: number; }
>a : string | undefined
>b : number | undefined
declare let x2: { a?: string, b?: number | undefined };
>x2 : { a?: string; b?: number | undefined; }
>a : string | undefined
>b : number | undefined
const y1 = test(x1);
>y1 : string | number
>test(x1) : string | number
>test : <T>(x: { [key: string]: T; }) => T
>x1 : { a?: string; b?: number; }
const y2 = test(x2);
>y2 : string | number | undefined
>test(x2) : string | number | undefined
>test : <T>(x: { [key: string]: T; }) => T
>x2 : { a?: string; b?: number | undefined; }
var v1: Required<{ a?: string, b?: number }>;
>v1 : Required<{ a?: string; b?: number; }>
>a : string | undefined
>b : number | undefined
var v1: { a: string, b: number };
>v1 : Required<{ a?: string; b?: number; }>
>a : string
>b : number
var v2: Required<{ a?: string, b?: number | undefined }>;
>v2 : Required<{ a?: string; b?: number | undefined; }>
>a : string | undefined
>b : number | undefined
var v2: { a: string, b: number | undefined };
>v2 : Required<{ a?: string; b?: number | undefined; }>
>a : string
>b : number | undefined
var v3: Partial<{ a: string, b: string }>;
>v3 : Partial<{ a: string; b: string; }>
>a : string
>b : string
var v3: { a?: string, b?: string };
>v3 : Partial<{ a: string; b: string; }>
>a : string | undefined
>b : string | undefined
var v4: Partial<{ a: string, b: string | undefined }>;
>v4 : Partial<{ a: string; b: string | undefined; }>
>a : string
>b : string | undefined
var v4: { a?: string, b?: string | undefined };
>v4 : Partial<{ a: string; b: string | undefined; }>
>a : string | undefined
>b : string | undefined
var v5: Required<Partial<{ a: string, b: string }>>;
>v5 : Required<Partial<{ a: string; b: string; }>>
>a : string
>b : string
var v5: { a: string, b: string };
>v5 : Required<Partial<{ a: string; b: string; }>>
>a : string
>b : string
var v6: Required<Partial<{ a: string, b: string | undefined }>>;
>v6 : Required<Partial<{ a: string; b: string | undefined; }>>
>a : string
>b : string | undefined
var v6: { a: string, b: string | undefined };
>v6 : Required<Partial<{ a: string; b: string | undefined; }>>
>a : string
>b : string | undefined
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