Add @template-covariant support

Author: arnaud-lb

src/Parser/PhpDocParser.php

@@ -161,6 +161,9 @@ public function parseTagValue(TokenIterator $tokens, string $tag): Ast\PhpDoc\Ph
 				case '@template':
 				case '@phpstan-template':
 				case '@psalm-template':
+				case '@template-covariant':
+				case '@phpstan-template-covariant':
+				case '@psalm-template-covariant':
 					$tagValue = $this->parseTemplateTagValue($tokens);
 					break;
 

tests/PHPStan/Parser/PhpDocParserTest.php

@@ -2371,6 +2371,21 @@ public function provideTemplateTagsData(): \Iterator
 				),
 			]),
 		];
+
+		yield [
+			'OK with covariance',
+			'/** @template-covariant T */',
+			new PhpDocNode([
+				new PhpDocTagNode(
+					'@template-covariant',
+					new TemplateTagValueNode(
+						'T',
+						null,
+						''
+					)
+				),
+			]),
+		];
 	}
 
 	public function provideExtendsTagsData(): \Iterator