68 lines
2.6 KiB
Plaintext
68 lines
2.6 KiB
Plaintext
==== tests/cases/conformance/types/objectTypeLiteral/callSignatures/typeParameterUsedAsTypeParameterConstraint.ts (18 errors) ====
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// Type parameters are in scope in their own and other type parameter lists
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function foo<T, U extends T>(x: T, y: U): T {
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~~~~~~~~~~~
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!!! error TS2313: Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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x = y;
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~
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!!! error TS2323: Type 'U' is not assignable to type 'T'.
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return y;
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~
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!!! error TS2323: Type 'U' is not assignable to type 'T'.
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}
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function foo2<U extends T, T>(x: T, y: U): T {
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~~~~~~~~~~~
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!!! error TS2313: Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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x = y;
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~
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!!! error TS2323: Type 'U' is not assignable to type 'T'.
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return y;
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~
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!!! error TS2323: Type 'U' is not assignable to type 'T'.
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}
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var f = function <T, U extends T>(x: T, y: U): T {
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~~~~~~~~~~~
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!!! error TS2313: Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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x = y;
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~
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!!! error TS2323: Type 'U' is not assignable to type 'T'.
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return y;
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~
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!!! error TS2323: Type 'U' is not assignable to type 'T'.
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}
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var f2 = function <U extends T, T>(x: T, y: U): T {
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~~~~~~~~~~~
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!!! error TS2313: Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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x = y;
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~
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!!! error TS2323: Type 'U' is not assignable to type 'T'.
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return y;
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~
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!!! error TS2323: Type 'U' is not assignable to type 'T'.
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}
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var f3 = <T, U extends T>(x: T, y: U): T => {
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~~~~~~~~~~~
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!!! error TS2313: Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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x = y;
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~
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!!! error TS2323: Type 'U' is not assignable to type 'T'.
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return y;
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~
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!!! error TS2323: Type 'U' is not assignable to type 'T'.
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}
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var f4 = <U extends T, T>(x: T, y: U): T => {
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~~~~~~~~~~~
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!!! error TS2313: Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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x = y;
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~
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!!! error TS2323: Type 'U' is not assignable to type 'T'.
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return y;
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~
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!!! error TS2323: Type 'U' is not assignable to type 'T'.
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} |