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tests/cases/compiler/typeParameterAssignmentCompat1.ts(8,5): error TS2322: Type 'Foo<U>' is not assignable to type 'Foo<T>'.
Type 'U' is not assignable to type 'T'.
'T' could be instantiated with an arbitrary type which could be unrelated to 'U'.
tests/cases/compiler/typeParameterAssignmentCompat1.ts(9,5): error TS2322: Type 'Foo<T>' is not assignable to type 'Foo<U>'.
tests/cases/compiler/typeParameterAssignmentCompat1.ts(16,9): error TS2322: Type 'Foo<U>' is not assignable to type 'Foo<T>'.
tests/cases/compiler/typeParameterAssignmentCompat1.ts(17,9): error TS2322: Type 'Foo<T>' is not assignable to type 'Foo<U>'.
==== tests/cases/compiler/typeParameterAssignmentCompat1.ts (4 errors) ====
interface Foo<T> {
frobble(value: T): T;
}
function f<T, U>(): Foo<U> {
var x: Foo<T>;
var y: Foo<U>;
x = y; // should be an error
~
!!! error TS2322: Type 'Foo<U>' is not assignable to type 'Foo<T>'.
!!! error TS2322: Type 'U' is not assignable to type 'T'.
!!! error TS2322: 'T' could be instantiated with an arbitrary type which could be unrelated to 'U'.
!!! related TS2208 tests/cases/compiler/typeParameterAssignmentCompat1.ts:5:15: This type parameter might need an `extends T` constraint.
return x;
~~~~~~~~~
!!! error TS2322: Type 'Foo<T>' is not assignable to type 'Foo<U>'.
}
class C<T> {
f<U>(): Foo<U> {
var x: Foo<T>;
var y: Foo<U>;
x = y; // should be an error
~
!!! error TS2322: Type 'Foo<U>' is not assignable to type 'Foo<T>'.
return x;
~~~~~~~~~
!!! error TS2322: Type 'Foo<T>' is not assignable to type 'Foo<U>'.
}
}
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