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tests/cases/conformance/types/typeRelationships/assignmentCompatibility/typeParameterAssignability.ts(4,5): error TS2322: Type 'U' is not assignable to type 'T'.
'T' could be instantiated with an arbitrary type which could be unrelated to 'U'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/typeParameterAssignability.ts(5,5): error TS2322: Type 'T' is not assignable to type 'U'.
'U' could be instantiated with an arbitrary type which could be unrelated to 'T'.
==== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/typeParameterAssignability.ts (2 errors) ====
// type parameters are not assignable to one another unless directly or indirectly constrained to one another
function foo<T, U>(t: T, u: U) {
t = u; // error
~
!!! 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/conformance/types/typeRelationships/assignmentCompatibility/typeParameterAssignability.ts:3:17: This type parameter might need an `extends T` constraint.
u = t; // error
~
!!! 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/conformance/types/typeRelationships/assignmentCompatibility/typeParameterAssignability.ts:3:14: This type parameter might need an `extends U` constraint.
}
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