inferStringLiteralUnionForBindingElement.types

=== tests/cases/compiler/inferStringLiteralUnionForBindingElement.ts ===
declare function func<T extends string>(arg: { keys: T[] }): { readonly keys: T[]; readonly firstKey: T; };
>func : <T extends string>(arg: {    keys: T[];}) => {    readonly keys: T[];    readonly firstKey: T;}
>arg : { keys: T[]; }
>keys : T[]
>keys : T[]
>firstKey : T

function func1() {
>func1 : () => void

    const { firstKey } = func({keys: ["aa", "bb"]})
>firstKey : "aa" | "bb"
>func({keys: ["aa", "bb"]}) : { readonly keys: ("aa" | "bb")[]; readonly firstKey: "aa" | "bb"; }
>func : <T extends string>(arg: { keys: T[]; }) => { readonly keys: T[]; readonly firstKey: T; }
>{keys: ["aa", "bb"]} : { keys: ("aa" | "bb")[]; }
>keys : ("aa" | "bb")[]
>["aa", "bb"] : ("aa" | "bb")[]
>"aa" : "aa"
>"bb" : "bb"

    const a: "aa" | "bb" = firstKey;
>a : "aa" | "bb"
>firstKey : "aa" | "bb"

    const { keys } = func({keys: ["aa", "bb"]})
>keys : ("aa" | "bb")[]
>func({keys: ["aa", "bb"]}) : { readonly keys: ("aa" | "bb")[]; readonly firstKey: "aa" | "bb"; }
>func : <T extends string>(arg: { keys: T[]; }) => { readonly keys: T[]; readonly firstKey: T; }
>{keys: ["aa", "bb"]} : { keys: ("aa" | "bb")[]; }
>keys : ("aa" | "bb")[]
>["aa", "bb"] : ("aa" | "bb")[]
>"aa" : "aa"
>"bb" : "bb"

    const b: ("aa" | "bb")[] = keys;
>b : ("aa" | "bb")[]
>keys : ("aa" | "bb")[]
}
  
function func2() {
>func2 : () => void

    const { keys, firstKey } = func({keys: ["aa", "bb"]})
>keys : ("aa" | "bb")[]
>firstKey : "aa" | "bb"
>func({keys: ["aa", "bb"]}) : { readonly keys: ("aa" | "bb")[]; readonly firstKey: "aa" | "bb"; }
>func : <T extends string>(arg: { keys: T[]; }) => { readonly keys: T[]; readonly firstKey: T; }
>{keys: ["aa", "bb"]} : { keys: ("aa" | "bb")[]; }
>keys : ("aa" | "bb")[]
>["aa", "bb"] : ("aa" | "bb")[]
>"aa" : "aa"
>"bb" : "bb"

    const a: "aa" | "bb" = firstKey;
>a : "aa" | "bb"
>firstKey : "aa" | "bb"

    const b: ("aa" | "bb")[] = keys;
>b : ("aa" | "bb")[]
>keys : ("aa" | "bb")[]
}

function func3() {
>func3 : () => void

    const x = func({keys: ["aa", "bb"]})
>x : { readonly keys: ("aa" | "bb")[]; readonly firstKey: "aa" | "bb"; }
>func({keys: ["aa", "bb"]}) : { readonly keys: ("aa" | "bb")[]; readonly firstKey: "aa" | "bb"; }
>func : <T extends string>(arg: { keys: T[]; }) => { readonly keys: T[]; readonly firstKey: T; }
>{keys: ["aa", "bb"]} : { keys: ("aa" | "bb")[]; }
>keys : ("aa" | "bb")[]
>["aa", "bb"] : ("aa" | "bb")[]
>"aa" : "aa"
>"bb" : "bb"

    const a: "aa" | "bb" = x.firstKey;
>a : "aa" | "bb"
>x.firstKey : "aa" | "bb"
>x : { readonly keys: ("aa" | "bb")[]; readonly firstKey: "aa" | "bb"; }
>firstKey : "aa" | "bb"

    const b: ("aa" | "bb")[] = x.keys;
>b : ("aa" | "bb")[]
>x.keys : ("aa" | "bb")[]
>x : { readonly keys: ("aa" | "bb")[]; readonly firstKey: "aa" | "bb"; }
>keys : ("aa" | "bb")[]
}