Generic with explicit argument as template type bound

[hrach]

Bug report

Using generic type as template bound doesn't accept explicit generic argument.

https://phpstan.org/r/93677d60-da20-4a8f-b6c7-071e017ca6f4

/** @template E */
interface Foo {}

interface A {
	/**
	 * @template T of Foo<string>
	 * @param T $a
	 */
	function x($a): void;
}

Currently gives Method A::x() has parameter $a with generic interface Foo but does not specify its types: E

[ondrejmirtes]

This type of bound is not supported yet, so the correct message should be something like this: https://phpstan.org/r/6c670ced-f96b-4903-a37b-fb57679f08a6

[ondrejmirtes]

Hi, I'm thinking about implementing this. Can you outline the difference in behaviour between these two examples and why would you use the first one? Ideally show me some differences and expected output with \PHPStan\dumpType($expr);, thanks.

/** @template E */
interface Foo {}

interface A {
	/**
	 * @template T of Foo<string>
	 * @param T $a
	 */
	function x($a): void;
}

And:

/** @template E */
interface Foo {}

interface A {
	/**
	 * @param Foo<string> $a
	 */
	function x($a): void;
}

[ondrejmirtes]

Implemented: phpstan/phpstan-src@e671cc0

Please test the hell out of this :)

[github-actions]

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