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tests/cases/compiler/typeParameterArgumentEquivalence2.ts(4,5): error TS2322: Type '(item: T) => boolean' is not assignable to type '(item: U) => boolean'.
Types of parameters 'item' and 'item' are incompatible.
Type 'U' is not assignable to type 'T'.
tests/cases/compiler/typeParameterArgumentEquivalence2.ts(5,5): error TS2322: Type '(item: U) => boolean' is not assignable to type '(item: T) => boolean'.
Types of parameters 'item' and 'item' are incompatible.
Type 'T' is not assignable to type 'U'.
==== tests/cases/compiler/typeParameterArgumentEquivalence2.ts (2 errors) ====
function foo<T,U>() {
var x: (item: U) => boolean;
var y: (item: T) => boolean;
x = y; // Should be an error
~
!!! error TS2322: Type '(item: T) => boolean' is not assignable to type '(item: U) => boolean'.
!!! error TS2322: Types of parameters 'item' and 'item' are incompatible.
!!! error TS2322: Type 'U' is not assignable to type 'T'.
y = x; // Shound be an error
~
!!! error TS2322: Type '(item: U) => boolean' is not assignable to type '(item: T) => boolean'.
!!! error TS2322: Types of parameters 'item' and 'item' are incompatible.
!!! error TS2322: Type 'T' is not assignable to type 'U'.
}
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