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tests/cases/conformance/types/typeParameters/typeArgumentLists/typeParameterAsTypeParameterConstraint2.ts(6,8): error TS2345: Argument of type 'string' is not assignable to parameter of type 'number'.
tests/cases/conformance/types/typeParameters/typeArgumentLists/typeParameterAsTypeParameterConstraint2.ts(7,8): error TS2345: Argument of type '{}' is not assignable to parameter of type 'number'.
tests/cases/conformance/types/typeParameters/typeArgumentLists/typeParameterAsTypeParameterConstraint2.ts(13,17): error TS2345: Argument of type 'NumberVariant' is not assignable to parameter of type 'number'.
tests/cases/conformance/types/typeParameters/typeArgumentLists/typeParameterAsTypeParameterConstraint2.ts(16,11): error TS2322: Type 'string' is not assignable to type 'number'.
tests/cases/conformance/types/typeParameters/typeArgumentLists/typeParameterAsTypeParameterConstraint2.ts(17,11): error TS2322: Type '{}' is not assignable to type 'number'.
tests/cases/conformance/types/typeParameters/typeArgumentLists/typeParameterAsTypeParameterConstraint2.ts(18,10): error TS2345: Argument of type 'string[]' is not assignable to parameter of type '{ length: any[]; }'.
Types of property 'length' are incompatible.
Type 'number' is not assignable to type 'any[]'.
==== tests/cases/conformance/types/typeParameters/typeArgumentLists/typeParameterAsTypeParameterConstraint2.ts (6 errors) ====
// using a type parameter as a constraint for a type parameter is invalid
// these should be errors unless otherwise noted
function foo<T, U extends T>(x: T, y: U): U { return y; } // this is now an error
foo(1, '');
~~
!!! error TS2345: Argument of type 'string' is not assignable to parameter of type 'number'.
foo(1, {});
~~
!!! error TS2345: Argument of type '{}' is not assignable to parameter of type 'number'.
interface NumberVariant extends Number {
x: number;
}
var n: NumberVariant;
var r3 = foo(1, n);
~
!!! error TS2345: Argument of type 'NumberVariant' is not assignable to parameter of type 'number'.
function foo2<T, U extends { length: T }>(x: T, y: U) { return y; } // this is now an error
foo2(1, { length: '' });
~~~~~~
!!! error TS2322: Type 'string' is not assignable to type 'number'.
!!! related TS6500 tests/cases/conformance/types/typeParameters/typeArgumentLists/typeParameterAsTypeParameterConstraint2.ts:15:30: The expected type comes from property 'length' which is declared here on type '{ length: number; }'
foo2(1, { length: {} });
~~~~~~
!!! error TS2322: Type '{}' is not assignable to type 'number'.
!!! related TS6500 tests/cases/conformance/types/typeParameters/typeArgumentLists/typeParameterAsTypeParameterConstraint2.ts:15:30: The expected type comes from property 'length' which is declared here on type '{ length: number; }'
foo2([], ['']);
~~~~
!!! error TS2345: Argument of type 'string[]' is not assignable to parameter of type '{ length: any[]; }'.
!!! error TS2345: Types of property 'length' are incompatible.
!!! error TS2345: Type 'number' is not assignable to type 'any[]'.
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