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=== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts ===
// Test that callback parameters are related covariantly
interface P<T> {
>P : Symbol(P, Decl(covariantCallbacks.ts, 0, 0))
>T : Symbol(T, Decl(covariantCallbacks.ts, 2, 12))
then(cb: (value: T) => void): void;
>then : Symbol(P.then, Decl(covariantCallbacks.ts, 2, 16))
>cb : Symbol(cb, Decl(covariantCallbacks.ts, 3, 9))
>value : Symbol(value, Decl(covariantCallbacks.ts, 3, 14))
>T : Symbol(T, Decl(covariantCallbacks.ts, 2, 12))
};
interface A { a: string }
>A : Symbol(A, Decl(covariantCallbacks.ts, 4, 2))
>a : Symbol(A.a, Decl(covariantCallbacks.ts, 6, 13))
interface B extends A { b: string }
>B : Symbol(B, Decl(covariantCallbacks.ts, 6, 25))
>A : Symbol(A, Decl(covariantCallbacks.ts, 4, 2))
>b : Symbol(B.b, Decl(covariantCallbacks.ts, 7, 23))
function f1(a: P<A>, b: P<B>) {
>f1 : Symbol(f1, Decl(covariantCallbacks.ts, 7, 35))
>a : Symbol(a, Decl(covariantCallbacks.ts, 9, 12))
>P : Symbol(P, Decl(covariantCallbacks.ts, 0, 0))
>A : Symbol(A, Decl(covariantCallbacks.ts, 4, 2))
>b : Symbol(b, Decl(covariantCallbacks.ts, 9, 20))
>P : Symbol(P, Decl(covariantCallbacks.ts, 0, 0))
>B : Symbol(B, Decl(covariantCallbacks.ts, 6, 25))
a = b;
>a : Symbol(a, Decl(covariantCallbacks.ts, 9, 12))
>b : Symbol(b, Decl(covariantCallbacks.ts, 9, 20))
b = a; // Error
>b : Symbol(b, Decl(covariantCallbacks.ts, 9, 20))
>a : Symbol(a, Decl(covariantCallbacks.ts, 9, 12))
}
function f2(a: Promise<A>, b: Promise<B>) {
>f2 : Symbol(f2, Decl(covariantCallbacks.ts, 12, 1))
>a : Symbol(a, Decl(covariantCallbacks.ts, 14, 12))
>Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
>A : Symbol(A, Decl(covariantCallbacks.ts, 4, 2))
>b : Symbol(b, Decl(covariantCallbacks.ts, 14, 26))
>Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
>B : Symbol(B, Decl(covariantCallbacks.ts, 6, 25))
a = b;
>a : Symbol(a, Decl(covariantCallbacks.ts, 14, 12))
>b : Symbol(b, Decl(covariantCallbacks.ts, 14, 26))
b = a; // Error
>b : Symbol(b, Decl(covariantCallbacks.ts, 14, 26))
>a : Symbol(a, Decl(covariantCallbacks.ts, 14, 12))
}
interface AList1 {
>AList1 : Symbol(AList1, Decl(covariantCallbacks.ts, 17, 1))
forEach(cb: (item: A) => void): void;
>forEach : Symbol(AList1.forEach, Decl(covariantCallbacks.ts, 19, 18))
>cb : Symbol(cb, Decl(covariantCallbacks.ts, 20, 12))
>item : Symbol(item, Decl(covariantCallbacks.ts, 20, 17))
>A : Symbol(A, Decl(covariantCallbacks.ts, 4, 2))
}
interface BList1 {
>BList1 : Symbol(BList1, Decl(covariantCallbacks.ts, 21, 1))
forEach(cb: (item: B) => void): void;
>forEach : Symbol(BList1.forEach, Decl(covariantCallbacks.ts, 23, 18))
>cb : Symbol(cb, Decl(covariantCallbacks.ts, 24, 12))
>item : Symbol(item, Decl(covariantCallbacks.ts, 24, 17))
>B : Symbol(B, Decl(covariantCallbacks.ts, 6, 25))
}
function f11(a: AList1, b: BList1) {
>f11 : Symbol(f11, Decl(covariantCallbacks.ts, 25, 1))
>a : Symbol(a, Decl(covariantCallbacks.ts, 27, 13))
>AList1 : Symbol(AList1, Decl(covariantCallbacks.ts, 17, 1))
>b : Symbol(b, Decl(covariantCallbacks.ts, 27, 23))
>BList1 : Symbol(BList1, Decl(covariantCallbacks.ts, 21, 1))
a = b;
>a : Symbol(a, Decl(covariantCallbacks.ts, 27, 13))
>b : Symbol(b, Decl(covariantCallbacks.ts, 27, 23))
b = a; // Error
>b : Symbol(b, Decl(covariantCallbacks.ts, 27, 23))
>a : Symbol(a, Decl(covariantCallbacks.ts, 27, 13))
}
interface AList2 {
>AList2 : Symbol(AList2, Decl(covariantCallbacks.ts, 30, 1))
forEach(cb: (item: A) => boolean): void;
>forEach : Symbol(AList2.forEach, Decl(covariantCallbacks.ts, 32, 18))
>cb : Symbol(cb, Decl(covariantCallbacks.ts, 33, 12))
>item : Symbol(item, Decl(covariantCallbacks.ts, 33, 17))
>A : Symbol(A, Decl(covariantCallbacks.ts, 4, 2))
}
interface BList2 {
>BList2 : Symbol(BList2, Decl(covariantCallbacks.ts, 34, 1))
forEach(cb: (item: A) => void): void;
>forEach : Symbol(BList2.forEach, Decl(covariantCallbacks.ts, 36, 18))
>cb : Symbol(cb, Decl(covariantCallbacks.ts, 37, 12))
>item : Symbol(item, Decl(covariantCallbacks.ts, 37, 17))
>A : Symbol(A, Decl(covariantCallbacks.ts, 4, 2))
}
function f12(a: AList2, b: BList2) {
>f12 : Symbol(f12, Decl(covariantCallbacks.ts, 38, 1))
>a : Symbol(a, Decl(covariantCallbacks.ts, 40, 13))
>AList2 : Symbol(AList2, Decl(covariantCallbacks.ts, 30, 1))
>b : Symbol(b, Decl(covariantCallbacks.ts, 40, 23))
>BList2 : Symbol(BList2, Decl(covariantCallbacks.ts, 34, 1))
a = b;
>a : Symbol(a, Decl(covariantCallbacks.ts, 40, 13))
>b : Symbol(b, Decl(covariantCallbacks.ts, 40, 23))
b = a; // Error
>b : Symbol(b, Decl(covariantCallbacks.ts, 40, 23))
>a : Symbol(a, Decl(covariantCallbacks.ts, 40, 13))
}
interface AList3 {
>AList3 : Symbol(AList3, Decl(covariantCallbacks.ts, 43, 1))
forEach(cb: (item: A) => void): void;
>forEach : Symbol(AList3.forEach, Decl(covariantCallbacks.ts, 45, 18))
>cb : Symbol(cb, Decl(covariantCallbacks.ts, 46, 12))
>item : Symbol(item, Decl(covariantCallbacks.ts, 46, 17))
>A : Symbol(A, Decl(covariantCallbacks.ts, 4, 2))
}
interface BList3 {
>BList3 : Symbol(BList3, Decl(covariantCallbacks.ts, 47, 1))
forEach(cb: (item: A, context: any) => void): void;
>forEach : Symbol(BList3.forEach, Decl(covariantCallbacks.ts, 49, 18))
>cb : Symbol(cb, Decl(covariantCallbacks.ts, 50, 12))
>item : Symbol(item, Decl(covariantCallbacks.ts, 50, 17))
>A : Symbol(A, Decl(covariantCallbacks.ts, 4, 2))
>context : Symbol(context, Decl(covariantCallbacks.ts, 50, 25))
}
function f13(a: AList3, b: BList3) {
>f13 : Symbol(f13, Decl(covariantCallbacks.ts, 51, 1))
>a : Symbol(a, Decl(covariantCallbacks.ts, 53, 13))
>AList3 : Symbol(AList3, Decl(covariantCallbacks.ts, 43, 1))
>b : Symbol(b, Decl(covariantCallbacks.ts, 53, 23))
>BList3 : Symbol(BList3, Decl(covariantCallbacks.ts, 47, 1))
a = b;
>a : Symbol(a, Decl(covariantCallbacks.ts, 53, 13))
>b : Symbol(b, Decl(covariantCallbacks.ts, 53, 23))
b = a; // Error
>b : Symbol(b, Decl(covariantCallbacks.ts, 53, 23))
>a : Symbol(a, Decl(covariantCallbacks.ts, 53, 13))
}
interface AList4 {
>AList4 : Symbol(AList4, Decl(covariantCallbacks.ts, 56, 1))
forEach(cb: (item: A) => A): void;
>forEach : Symbol(AList4.forEach, Decl(covariantCallbacks.ts, 58, 18))
>cb : Symbol(cb, Decl(covariantCallbacks.ts, 59, 12))
>item : Symbol(item, Decl(covariantCallbacks.ts, 59, 17))
>A : Symbol(A, Decl(covariantCallbacks.ts, 4, 2))
>A : Symbol(A, Decl(covariantCallbacks.ts, 4, 2))
}
interface BList4 {
>BList4 : Symbol(BList4, Decl(covariantCallbacks.ts, 60, 1))
forEach(cb: (item: B) => B): void;
>forEach : Symbol(BList4.forEach, Decl(covariantCallbacks.ts, 62, 18))
>cb : Symbol(cb, Decl(covariantCallbacks.ts, 63, 12))
>item : Symbol(item, Decl(covariantCallbacks.ts, 63, 17))
>B : Symbol(B, Decl(covariantCallbacks.ts, 6, 25))
>B : Symbol(B, Decl(covariantCallbacks.ts, 6, 25))
}
function f14(a: AList4, b: BList4) {
>f14 : Symbol(f14, Decl(covariantCallbacks.ts, 64, 1))
>a : Symbol(a, Decl(covariantCallbacks.ts, 66, 13))
>AList4 : Symbol(AList4, Decl(covariantCallbacks.ts, 56, 1))
>b : Symbol(b, Decl(covariantCallbacks.ts, 66, 23))
>BList4 : Symbol(BList4, Decl(covariantCallbacks.ts, 60, 1))
a = b;
>a : Symbol(a, Decl(covariantCallbacks.ts, 66, 13))
>b : Symbol(b, Decl(covariantCallbacks.ts, 66, 23))
b = a; // Error
>b : Symbol(b, Decl(covariantCallbacks.ts, 66, 23))
>a : Symbol(a, Decl(covariantCallbacks.ts, 66, 13))
}
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