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=== tests/cases/compiler/indexWithUndefinedAndNull.ts ===
interface N {
>N : Symbol(N, Decl(indexWithUndefinedAndNull.ts, 0, 0))
[n: number]: string;
>n : Symbol(n, Decl(indexWithUndefinedAndNull.ts, 1, 5))
}
interface S {
>S : Symbol(S, Decl(indexWithUndefinedAndNull.ts, 2, 1))
[s: string]: number;
>s : Symbol(s, Decl(indexWithUndefinedAndNull.ts, 4, 5))
}
let n: N;
>n : Symbol(n, Decl(indexWithUndefinedAndNull.ts, 6, 3))
>N : Symbol(N, Decl(indexWithUndefinedAndNull.ts, 0, 0))
let s: S;
>s : Symbol(s, Decl(indexWithUndefinedAndNull.ts, 7, 3))
>S : Symbol(S, Decl(indexWithUndefinedAndNull.ts, 2, 1))
let str: string = n[undefined];
>str : Symbol(str, Decl(indexWithUndefinedAndNull.ts, 8, 3))
>n : Symbol(n, Decl(indexWithUndefinedAndNull.ts, 6, 3))
>undefined : Symbol(undefined)
str = n[null];
>str : Symbol(str, Decl(indexWithUndefinedAndNull.ts, 8, 3))
>n : Symbol(n, Decl(indexWithUndefinedAndNull.ts, 6, 3))
let num: number = s[undefined];
>num : Symbol(num, Decl(indexWithUndefinedAndNull.ts, 10, 3))
>s : Symbol(s, Decl(indexWithUndefinedAndNull.ts, 7, 3))
>undefined : Symbol(undefined)
num = s[null];
>num : Symbol(num, Decl(indexWithUndefinedAndNull.ts, 10, 3))
>s : Symbol(s, Decl(indexWithUndefinedAndNull.ts, 7, 3))
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