How is callable type node with mixed variadic argument parsed?

Author: ondrejmirtes

tests/PHPStan/Parser/TypeParserTest.php

@@ -822,6 +822,12 @@ public function provideParseData(): array
 					)
 				),
 			],
+			[
+				'callable(mixed...): TReturn',
+				new CallableTypeNode(new IdentifierTypeNode('callable'), [
+					new CallableTypeParameterNode(new IdentifierTypeNode('mixed'), false, true, '', false),
+				], new IdentifierTypeNode('TReturn')),
+			],
 		];
 	}