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=== tests/cases/compiler/nonNullMappedType.ts ===
function f<A extends string>(p0: { [key in A]: {} | undefined }, p1: A) {
>f : Symbol(f, Decl(nonNullMappedType.ts, 0, 0))
>A : Symbol(A, Decl(nonNullMappedType.ts, 0, 11))
>p0 : Symbol(p0, Decl(nonNullMappedType.ts, 0, 29))
>key : Symbol(key, Decl(nonNullMappedType.ts, 0, 36))
>A : Symbol(A, Decl(nonNullMappedType.ts, 0, 11))
>p1 : Symbol(p1, Decl(nonNullMappedType.ts, 0, 64))
>A : Symbol(A, Decl(nonNullMappedType.ts, 0, 11))
const v: {} = p0[p1]!;
>v : Symbol(v, Decl(nonNullMappedType.ts, 1, 9))
>p0 : Symbol(p0, Decl(nonNullMappedType.ts, 0, 29))
>p1 : Symbol(p1, Decl(nonNullMappedType.ts, 0, 64))
}
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