Fix resolution for class names in lazily-evaluated class constants

Fixes #2413

src/Psalm/Internal/Codebase/ClassLikes.php

@@ -1615,6 +1615,10 @@ class ClassLikes
         }
 
         if ($c instanceof UnresolvedConstant\ClassConstant) {
+            if ($c->name === 'class') {
+                return new Type\Atomic\TLiteralClassString($c->fqcln);
+            }
+
             $found_type = $this->getConstantForClass(
                 $c->fqcln,
                 $c->name,

tests/ConstantTest.php

@@ -438,7 +438,27 @@ class ConstantTest extends TestCase
                     }
 
                     echo Clazz::cons2;',
-            ]
+            ],
+            'classConstantClassReferencedLazily' => [
+                '<?php
+                    /** @return array<string, int> */
+                    function getMap(): array {
+                        return Mapper::MAP;
+                    }
+
+                    class Mapper {
+                        public const MAP = [
+                            Foo::class => self::A,
+                            Foo::BAR => self::A,
+                        ];
+
+                        private const A = 5;
+                    }
+
+                    class Foo {
+                        public const BAR = "bar";
+                    }'
+            ],
         ];
     }