From 41a6afda32b7f3bbedf7afce07e85801fdead603 Mon Sep 17 00:00:00 2001
From: Gregory Hargreaves <gphargreaves@googlemail.com>
Date: Fri, 7 Oct 2022 09:44:10 +0100
Subject: [PATCH] Add check for const with reserved word class

---
 src/Psalm/Internal/Analyzer/ClassAnalyzer.php | 10 ++++++++++
 tests/ClassTest.php                           | 12 ++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/Psalm/Internal/Analyzer/ClassAnalyzer.php b/src/Psalm/Internal/Analyzer/ClassAnalyzer.php
index f55fbaaa9..eca4f0f49 100644
--- a/src/Psalm/Internal/Analyzer/ClassAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/ClassAnalyzer.php
@@ -508,6 +508,16 @@ class ClassAnalyzer extends ClassLikeAnalyzer
                 $member_stmts[] = $stmt;
 
                 foreach ($stmt->consts as $const) {
+                    if ($const->name->toLowerString() === 'class') {
+                        IssueBuffer::maybeAdd(
+                            new ReservedWord(
+                                'A class constant cannot be named \'class\'',
+                                new CodeLocation($this, $this->class),
+                                $this->fq_class_name
+                            )
+                        );
+                    }
+                    
                     $const_id = strtolower($this->fq_class_name) . '::' . $const->name;
 
                     foreach ($codebase->class_constants_to_rename as $original_const_id => $new_const_name) {
diff --git a/tests/ClassTest.php b/tests/ClassTest.php
index 342fe78b0..55a82d3f7 100644
--- a/tests/ClassTest.php
+++ b/tests/ClassTest.php
@@ -925,6 +925,18 @@ class ClassTest extends TestCase
                 ',
                 'error_message' => 'InvalidTraversableImplementation',
             ],
+            'cannotNameClassConstantClass' => [
+                '<?php
+                class Foo
+                {
+                    /** @var class-string<Bar> */
+                    protected const CLASS = Bar::class;
+                }
+                
+                class Bar {}
+                ',
+                'error_message' => 'ReservedWord',
+            ]
         ];
     }
 }