Scalar type in PHPDoc can mean an existing class

src/PhpDoc/TypeNodeResolver.php

@@ -156,6 +156,12 @@ private function resolveIdentifierTypeNode(IdentifierTypeNode $typeNode, NameSco
 				return new BenevolentUnionType([new IntegerType(), new StringType()]);
 
 			case 'scalar':
+				$type = $this->tryResolvePseudoTypeClassType($typeNode, $nameScope);
+
+				if ($type !== null) {
+					return $type;
+				}
+
 				return new UnionType([new IntegerType(), new FloatType(), new StringType(), new BooleanType()]);
 
 			case 'number':

tests/PHPStan/Rules/Generics/ClassAncestorsRuleTest.php

@@ -216,4 +216,9 @@ public function testCrossCheckInterfaces(): void
 		]);
 	}
 
+	public function testScalarClassName(): void
+	{
+		$this->analyse([__DIR__ . '/data/scalar-class-name.php'], []);
+	}
+
 }

tests/PHPStan/Rules/Generics/data/scalar-class-name.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace MaxGoryunov\SavingIterator\Src;
+/**
+ * @template T
+ */
+interface Scalar
+{
+	/**
+	 * @return T
+	 */
+	public function value(): mixed;
+}
+
+namespace MaxGoryunov\SavingIterator\Fakes;
+
+use Closure;
+use MaxGoryunov\SavingIterator\Src\Scalar;
+
+/**
+ * @template T
+ * @implements Scalar<T>
+ */
+class The implements Scalar
+{
+	/**
+	 * @param T                 $subject
+	 * @param Closure(T): mixed $context
+	 */
+	public function __construct(
+		/**
+		 * @var T
+		 */
+		private mixed $subject,
+		/**
+		 * @var Closure(T): mixed
+		 */
+		private Closure $context
+	) {
+	}
+	/**
+	 * @return T
+	 */
+	public function value(): mixed
+	{
+		($this->context)($this->subject);
+		return $this->subject;
+	}
+}