Test pipe operator with generics

Author: ondrejmirtes

tests/PHPStan/Analyser/nsrt/pipe-operator.php

@@ -2,6 +2,7 @@
 
 namespace PipeOperatorTypes;
 
+use stdClass;
 use function PHPStan\Testing\assertType;
 
 class Foo
@@ -223,4 +224,26 @@ public function testConditional(): void
 		assertType('int', 'foo' |> fn($x) => $this->doConditional($x));
 	}
 
+	/**
+	 * @template T
+	 * @param T $input
+	 * @return T
+	 */
+	public function doGenerics($input)
+	{
+		return $t;
+	}
+
+	public function testGenerics(): void
+	{
+		assertType(stdClass::class, new stdClass() |> $this->doGenerics(...));
+		assertType(stdClass::class, new stdClass() |> $this->doGenerics(...));
+
+		assertType(stdClass::class, new stdClass() |> fn($x) => $this->doGenerics($x));
+		assertType(stdClass::class, new stdClass() |> fn($x) => $this->doGenerics($x));
+
+		assertType('null', null |> $this->doConditional(...) |> $this->doGenerics(...));
+		assertType('int', 'foo' |> $this->doConditional(...) |> $this->doGenerics(...));
+	}
+
 }