Using attributes for setting alias name

phpstan.neon

@@ -8,3 +8,5 @@ parameters:
         - '#[^:]+::__debugInfo\(\) return type has no value type specified in iterable type array#'
         - '#Class [^\s]+ has an uninitialized readonly property \$.+?\. Assign it in the constructor#'
         - '#Readonly property [^\s]+ is assigned outside of the constructor#'
+        - '#Class [^\s]+ is not an Attribute class#'
+        - '#Attribute class [^\s]+ does not have a constructor and must be instantiated without any parameters#'

src/VM/Core/Runtime/Attribute/BindAliasAs.php

@@ -4,4 +4,5 @@
 
 namespace RubyVM\VM\Core\Runtime\Attribute;
 
+#[\Attribute]
 class BindAliasAs {}

src/VM/Core/YARV/Essential/Symbol/RegExpSymbol.php

@@ -8,7 +8,7 @@ class RegExpSymbol implements SymbolInterface, \Stringable
 {
     public function __construct(
         private readonly StringSymbol $source,
-        private readonly int $option,
+        private readonly int|null $option,
     ) {}
 
     public function valueOf(): StringSymbol
@@ -21,7 +21,7 @@ public function __toString(): string
         return (string) $this->source;
     }
 
-    public function option(): int
+    public function option(): int|null
     {
         return $this->option;
     }