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tests/cases/compiler/typeParameterArgumentEquivalence5.ts(4,5): error TS2322: Type '() => (item: any) => T' is not assignable to type '() => (item: any) => U'.
Call signature return types '(item: any) => T' and '(item: any) => U' are incompatible.
Type 'T' is not assignable to type 'U'.
'U' could be instantiated with an arbitrary type which could be unrelated to 'T'.
tests/cases/compiler/typeParameterArgumentEquivalence5.ts(5,5): error TS2322: Type '() => (item: any) => U' is not assignable to type '() => (item: any) => T'.
Call signature return types '(item: any) => U' and '(item: any) => T' are incompatible.
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/typeParameterArgumentEquivalence5.ts (2 errors) ====
function foo<T,U>() {
var x: () => (item) => U;
var y: () => (item) => T;
x = y; // Should be an error
~
!!! error TS2322: Type '() => (item: any) => T' is not assignable to type '() => (item: any) => U'.
!!! error TS2322: Call signature return types '(item: any) => T' and '(item: any) => U' are incompatible.
!!! error TS2322: Type 'T' is not assignable to type 'U'.
!!! error TS2322: 'U' could be instantiated with an arbitrary type which could be unrelated to 'T'.
!!! related TS2208 tests/cases/compiler/typeParameterArgumentEquivalence5.ts:1:14: This type parameter might need an `extends U` constraint.
y = x; // Shound be an error
~
!!! error TS2322: Type '() => (item: any) => U' is not assignable to type '() => (item: any) => T'.
!!! error TS2322: Call signature return types '(item: any) => U' and '(item: any) => T' are incompatible.
!!! 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/typeParameterArgumentEquivalence5.ts:1:16: This type parameter might need an `extends T` constraint.
}
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