Impact analysis proposed PHP 8.6 deprecation of let as identifier on Packagist top 4000

0-php-rfc-deprecations-8.6-identifier-let.xml

<?xml version="1.0"?>
<ruleset name="Impact check for https://wiki.php.net/rfc/deprecations_php_8_6">

    <!-- This ruleset should only be used in conjunction with PHPCompatibility at commit
    https://github.com/PHPCompatibility/PHPCompatibility/commit/cc67a3824dda9612896f5892c2d6d9408fa20d77 -->

    <file>sources</file>

    <arg name="extensions" value="php"/>
    <arg value="ps"/>

    <arg name="basepath" value="./sources/"/>
    <arg name="parallel" value="8"/>

    <arg name="no-colors"/>
    <arg name="ignore-annotations"/>

    <arg name="report" value="code,summary,source"/>

    <exclude-pattern>*/vendor/*</exclude-pattern>
    <exclude-pattern>*/node_modules/*</exclude-pattern>

    <!-- We are specifically and only checking for the PHP 8.6 deprecation(s). -->
    <config name="testVersion" value="8.6"/>

    <rule ref="PHPCompatibility.Keywords.ForbiddenClassAlias.letFound"/>
    <rule ref="PHPCompatibility.Keywords.ForbiddenNames.letFound"/>

    <rule ref="Internal.NoCodeFound">
        <severity>0</severity>
    </rule>
    <rule ref="Internal.LineEndings.Mixed">
        <severity>0</severity>
    </rule>

</ruleset>

1 - 20260702-report-source.txt

PHP CODE SNIFFER VIOLATION SOURCE SUMMARY
----------------------------------------------------------------------
SOURCE                                                           COUNT
----------------------------------------------------------------------
PHPCompatibility.Keywords.ForbiddenNames.letFound                3
----------------------------------------------------------------------
A TOTAL OF 3 SNIFF VIOLATIONS WERE FOUND IN 1 SOURCE
----------------------------------------------------------------------

2 - 20260702-report-summary.txt

PHP CODE SNIFFER REPORT SUMMARY
------------------------------------------------------------------------------------------
FILE                                                                      ERRORS  WARNINGS
------------------------------------------------------------------------------------------
phpspec\phpspec--9.0.0-beta\src\PhpSpec\functions.php                     1       0
widmogrod\php-functional--7.0.1\src\Monad\Control\Doo\actions.php         1       0
widmogrod\php-functional--7.0.1\src\Monad\Control\Doo\Algebra\Let.php     1       0
------------------------------------------------------------------------------------------
A TOTAL OF 3 ERRORS AND 0 WARNINGS WERE FOUND IN 3 FILES
------------------------------------------------------------------------------------------

3 - 20260702-report-code.txt

FILE: phpspec\phpspec--9.0.0-beta\src\PhpSpec\functions.php
------------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 1 ERROR AFFECTING 1 LINE
------------------------------------------------------------------------------------------------------------------------------------------------------
LINE 132: ERROR Function name, class name, namespace name or constant name can not be reserved keyword 'let' (since version 8.6)
                (PHPCompatibility.Keywords.ForbiddenNames.letFound)
------------------------------------------------------------------------------------------------------------------------------------------------------
   130:   * @param Closure|null $setter value factory when first arg is a property name
   131:   */
>> 132:  function let(string|Closure $propertyOrSetter, ?Closure $setter = null): void
   133:  {
   134:      $scope = DispatcherRegistry::dispatcher()->currentScope();
------------------------------------------------------------------------------------------------------------------------------------------------------

FILE: widmogrod\php-functional--7.0.1\src\Monad\Control\Doo\actions.php
------------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 1 ERROR AFFECTING 1 LINE
------------------------------------------------------------------------------------------------------------------------------------------------------
LINE 12: ERROR Function name, class name, namespace name or constant name can not be reserved keyword 'let' (since version 8.6)
               (PHPCompatibility.Keywords.ForbiddenNames.letFound)
------------------------------------------------------------------------------------------------------------------------------------------------------
   10:  use function Widmogrod\Monad\Free\liftF;
   11:  
>> 12:  function let(string $name, Monad $m): MonadFree
   13:  {
   14:      return $m instanceof MonadFree
------------------------------------------------------------------------------------------------------------------------------------------------------

FILE: widmogrod\php-functional--7.0.1\src\Monad\Control\Doo\Algebra\Let.php
------------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 1 ERROR AFFECTING 1 LINE
------------------------------------------------------------------------------------------------------------------------------------------------------
LINE 11: ERROR Function name, class name, namespace name or constant name can not be reserved keyword 'let' (since version 8.6)
               (PHPCompatibility.Keywords.ForbiddenNames.letFound)
------------------------------------------------------------------------------------------------------------------------------------------------------
    9:  use Widmogrod\Monad\Free\MonadFree;
   10:  
>> 11:  class Let implements DooF
   12:  {
   13:      private $name;
------------------------------------------------------------------------------------------------------------------------------------------------------