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Added a test.

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This commit is contained in:
Daniel Rosenwasser 2016-12-30 12:14:31 -05:00
parent 69e0677ea1
commit d22f4fb513
1 changed files with 27 additions and 0 deletions
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27
tests/cases/conformance/types/typeRelationships/instanceOf/narrowingGenericTypeFromInstanceof01.ts Normal file
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class A<T> {
constructor(private a: string) { }
}
class B<T> {
}
function acceptA<T>(a: A<T>) { }
function acceptB<T>(b: B<T>) { }
function test<T>(x: A<T> | B<T>) {
if (x instanceof B) {
acceptA(x);
}
if (x instanceof A) {
acceptA(x);
}
if (x instanceof B) {
acceptB(x);
}
if (x instanceof B) {
acceptB(x);
}
}