2014-09-12 22:35:07 +02:00
tests/cases/conformance/types/typeRelationships/apparentType/apparentTypeSupertype.ts(9,7): error TS2416: Class 'Derived<U>' incorrectly extends base class 'Base':
Types of property 'x' are incompatible:
Type 'U' is not assignable to type 'string'.
2014-07-13 01:04:16 +02:00
==== tests/cases/conformance/types/typeRelationships/apparentType/apparentTypeSupertype.ts (1 errors) ====
// subtype checks use the apparent type of the target type
// S is a subtype of a type T, and T is a supertype of S, if one of the following is true, where S' denotes the apparent type (section 3.8.1) of S:
class Base {
x: string;
}
// is String (S) a subtype of U extends String (T)? Would only be true if we used the apparent type of U (T)
class Derived<U extends String> extends Base { // error
~~~~~~~
2014-09-12 00:19:57 +02:00
!!! error TS2416: Class 'Derived<U>' incorrectly extends base class 'Base':
!!! error TS2416: Types of property 'x' are incompatible:
!!! error TS2416: Type 'U' is not assignable to type 'string'.
2014-07-13 01:04:16 +02:00
x: U;
}