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=== tests/cases/compiler/wideningWithTopLevelTypeParameter.ts ===
type C1<T> = T extends unknown ? T | undefined : never;
>C1 : Symbol(C1, Decl(wideningWithTopLevelTypeParameter.ts, 0, 0))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 0, 8))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 0, 8))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 0, 8))
type C2<T> = T extends unknown ? T | undefined : never;
>C2 : Symbol(C2, Decl(wideningWithTopLevelTypeParameter.ts, 0, 55))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 1, 8))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 1, 8))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 1, 8))
type C3<T> = T extends unknown ? T | undefined : never;
>C3 : Symbol(C3, Decl(wideningWithTopLevelTypeParameter.ts, 1, 55))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 2, 8))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 2, 8))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 2, 8))
type C4<T> = T extends unknown ? T | undefined : never;
>C4 : Symbol(C4, Decl(wideningWithTopLevelTypeParameter.ts, 2, 55))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 3, 8))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 3, 8))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 3, 8))
declare function f0<T>(x: T): [T];
>f0 : Symbol(f0, Decl(wideningWithTopLevelTypeParameter.ts, 3, 55))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 5, 20))
>x : Symbol(x, Decl(wideningWithTopLevelTypeParameter.ts, 5, 23))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 5, 20))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 5, 20))
declare function f1<T>(x: C1<T>): [T];
>f1 : Symbol(f1, Decl(wideningWithTopLevelTypeParameter.ts, 5, 34))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 6, 20))
>x : Symbol(x, Decl(wideningWithTopLevelTypeParameter.ts, 6, 23))
>C1 : Symbol(C1, Decl(wideningWithTopLevelTypeParameter.ts, 0, 0))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 6, 20))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 6, 20))
declare function f2<T>(x: C1<C2<T>>): [T];
>f2 : Symbol(f2, Decl(wideningWithTopLevelTypeParameter.ts, 6, 38))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 7, 20))
>x : Symbol(x, Decl(wideningWithTopLevelTypeParameter.ts, 7, 23))
>C1 : Symbol(C1, Decl(wideningWithTopLevelTypeParameter.ts, 0, 0))
>C2 : Symbol(C2, Decl(wideningWithTopLevelTypeParameter.ts, 0, 55))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 7, 20))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 7, 20))
declare function f3<T>(x: C1<C2<C3<T>>>): [T];
>f3 : Symbol(f3, Decl(wideningWithTopLevelTypeParameter.ts, 7, 42))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 8, 20))
>x : Symbol(x, Decl(wideningWithTopLevelTypeParameter.ts, 8, 23))
>C1 : Symbol(C1, Decl(wideningWithTopLevelTypeParameter.ts, 0, 0))
>C2 : Symbol(C2, Decl(wideningWithTopLevelTypeParameter.ts, 0, 55))
>C3 : Symbol(C3, Decl(wideningWithTopLevelTypeParameter.ts, 1, 55))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 8, 20))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 8, 20))
declare function f4<T>(x: C1<C2<C3<C4<T>>>>): [T];
>f4 : Symbol(f4, Decl(wideningWithTopLevelTypeParameter.ts, 8, 46))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 9, 20))
>x : Symbol(x, Decl(wideningWithTopLevelTypeParameter.ts, 9, 23))
>C1 : Symbol(C1, Decl(wideningWithTopLevelTypeParameter.ts, 0, 0))
>C2 : Symbol(C2, Decl(wideningWithTopLevelTypeParameter.ts, 0, 55))
>C3 : Symbol(C3, Decl(wideningWithTopLevelTypeParameter.ts, 1, 55))
>C4 : Symbol(C4, Decl(wideningWithTopLevelTypeParameter.ts, 2, 55))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 9, 20))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 9, 20))
const c0 = f0(7); // [number]
>c0 : Symbol(c0, Decl(wideningWithTopLevelTypeParameter.ts, 11, 5))
>f0 : Symbol(f0, Decl(wideningWithTopLevelTypeParameter.ts, 3, 55))
const c1 = f1(7); // [number]
>c1 : Symbol(c1, Decl(wideningWithTopLevelTypeParameter.ts, 12, 5))
>f1 : Symbol(f1, Decl(wideningWithTopLevelTypeParameter.ts, 5, 34))
const c2 = f2(7); // [number]
>c2 : Symbol(c2, Decl(wideningWithTopLevelTypeParameter.ts, 13, 5))
>f2 : Symbol(f2, Decl(wideningWithTopLevelTypeParameter.ts, 6, 38))
const c3 = f3(7); // [number]
>c3 : Symbol(c3, Decl(wideningWithTopLevelTypeParameter.ts, 14, 5))
>f3 : Symbol(f3, Decl(wideningWithTopLevelTypeParameter.ts, 7, 42))
const c4 = f4(7); // [7] since we have an internal nesting limit of 3
>c4 : Symbol(c4, Decl(wideningWithTopLevelTypeParameter.ts, 15, 5))
>f4 : Symbol(f4, Decl(wideningWithTopLevelTypeParameter.ts, 8, 46))
// Repro from #52620
class FormControl<T> {
>FormControl : Symbol(FormControl, Decl(wideningWithTopLevelTypeParameter.ts, 15, 17))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 19, 18))
constructor(t: T extends undefined ? never : T) {}
>t : Symbol(t, Decl(wideningWithTopLevelTypeParameter.ts, 20, 16))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 19, 18))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 19, 18))
}
const a = new FormControl(''); // string
>a : Symbol(a, Decl(wideningWithTopLevelTypeParameter.ts, 23, 5))
>FormControl : Symbol(FormControl, Decl(wideningWithTopLevelTypeParameter.ts, 15, 17))
class FormControl2<T> {
>FormControl2 : Symbol(FormControl2, Decl(wideningWithTopLevelTypeParameter.ts, 23, 30))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 25, 19))
constructor(t: T | string) {}
>t : Symbol(t, Decl(wideningWithTopLevelTypeParameter.ts, 26, 16))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 25, 19))
}
const b = new FormControl2(''); // string
>b : Symbol(b, Decl(wideningWithTopLevelTypeParameter.ts, 29, 5))
>FormControl2 : Symbol(FormControl2, Decl(wideningWithTopLevelTypeParameter.ts, 23, 30))
class FormControl3<T> {
>FormControl3 : Symbol(FormControl3, Decl(wideningWithTopLevelTypeParameter.ts, 29, 31))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 31, 19))
constructor(t: T extends undefined ? never : T | string) {}
>t : Symbol(t, Decl(wideningWithTopLevelTypeParameter.ts, 32, 16))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 31, 19))
>T : Symbol(T, Decl(wideningWithTopLevelTypeParameter.ts, 31, 19))
}
const c = new FormControl3(''); // string
>c : Symbol(c, Decl(wideningWithTopLevelTypeParameter.ts, 35, 5))
>FormControl3 : Symbol(FormControl3, Decl(wideningWithTopLevelTypeParameter.ts, 29, 31))
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