167 lines
5.2 KiB
Plaintext
167 lines
5.2 KiB
Plaintext
==== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/typeParameterAssignability2.ts (47 errors) ====
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// type parameters are not assignable to one another unless directly or indirectly constrained to one another
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function foo<T, U extends T>(t: T, u: U) {
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~~~~~~~~~~~
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!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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t = u; // error
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~
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!!! Type 'U' is not assignable to type 'T'.
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u = t; // ok
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~
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!!! Type 'T' is not assignable to type 'U'.
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}
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function foo2<T extends U, U>(t: T, u: U) {
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~~~~~~~~~~~
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!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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t = u; // error
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~
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!!! Type 'U' is not assignable to type 'T'.
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u = t; // ok
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~
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!!! Type 'T' is not assignable to type 'U'.
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}
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function foo3<T extends U, U extends V, V>(t: T, u: U, v: V) {
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~~~~~~~~~~~
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!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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~~~~~~~~~~~
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!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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t = u; // error
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~
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!!! Type 'U' is not assignable to type 'T'.
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u = t;
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~
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!!! Type 'T' is not assignable to type 'U'.
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t = v; // error
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~
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!!! Type 'V' is not assignable to type 'T'.
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v = t; // ok
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~
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!!! Type 'T' is not assignable to type 'V'.
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u = v; // error
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~
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!!! Type 'V' is not assignable to type 'U'.
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v = u; // ok
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~
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!!! Type 'U' is not assignable to type 'V'.
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}
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function foo4<T extends U, U extends V, V extends Date>(t: T, u: U, v: V) {
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~~~~~~~~~~~
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!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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~~~~~~~~~~~
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!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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t = u; // error
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~
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!!! Type 'U' is not assignable to type 'T'.
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t = v; // error
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~
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!!! Type 'V' is not assignable to type 'T'.
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t = new Date(); // error
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!!! Type 'Date' is not assignable to type 'T'.
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u = t;
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~
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!!! Type 'T' is not assignable to type 'U'.
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u = v; // error
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~
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!!! Type 'V' is not assignable to type 'U'.
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u = new Date(); // error
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~
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!!! Type 'Date' is not assignable to type 'U'.
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v = t;
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~
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!!! Type 'T' is not assignable to type 'V'.
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v = u;
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~
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!!! Type 'U' is not assignable to type 'V'.
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v = new Date(); // ok
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~
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!!! Type 'Date' is not assignable to type 'V'.
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var d: Date;
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d = t; // ok
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~
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!!! Type 'T' is not assignable to type 'Date'.
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d = u; // ok
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~
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!!! Type 'U' is not assignable to type 'Date'.
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d = v; // ok
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}
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// same as foo4 with different type parameter ordering
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function foo5<V extends Date, U extends V, T extends U>(t: T, u: U, v: V) {
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~~~~~~~~~~~
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!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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~~~~~~~~~~~
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!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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t = u; // error
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~
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!!! Type 'U' is not assignable to type 'T'.
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t = v; // error
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~
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!!! Type 'V' is not assignable to type 'T'.
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t = new Date(); // error
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~
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!!! Type 'Date' is not assignable to type 'T'.
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u = t;
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~
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!!! Type 'T' is not assignable to type 'U'.
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u = v; // error
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~
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!!! Type 'V' is not assignable to type 'U'.
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u = new Date(); // error
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~
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!!! Type 'Date' is not assignable to type 'U'.
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v = t;
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~
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!!! Type 'T' is not assignable to type 'V'.
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v = u;
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~
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!!! Type 'U' is not assignable to type 'V'.
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v = new Date(); // ok
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~
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!!! Type 'Date' is not assignable to type 'V'.
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var d: Date;
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d = t; // ok
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~
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!!! Type 'T' is not assignable to type 'Date'.
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d = u; // ok
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~
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!!! Type 'U' is not assignable to type 'Date'.
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d = v; // ok
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}
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function foo6<T extends U, U, V>(t: T, u: U, v: V) {
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~~~~~~~~~~~
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!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
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t = u; // error
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~
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!!! Type 'U' is not assignable to type 'T'.
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t = v; // error
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~
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!!! Type 'V' is not assignable to type 'T'.
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u = t; // ok
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~
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!!! Type 'T' is not assignable to type 'U'.
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u = v; // error
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~
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!!! Type 'V' is not assignable to type 'U'.
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v = t; // error
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~
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!!! Type 'T' is not assignable to type 'V'.
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v = u; // error
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~
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!!! Type 'U' is not assignable to type 'V'.
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} |