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Idea: Add a way to indicate that a template type is a subtype of another type #1666

TysonAndre opened this issue May 6, 2018 · 0 comments


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commented May 6, 2018

E.g. should be able to indicate that something is a subclass/subtype of another type.

If the below example is used (e.g. in phpdoc) without template annotations, it should still be able to infer that getFirstElement returns object

(The constructor should warn about non-objects)

 * @template T extends object
class MyCollection {
    // ...
    /** @return T */
    public function getFirstElement() {}
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