what autoloads what in plain load dot php

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diff --git a/includes/AutoLoader.php b/includes/AutoLoader.php
index adca80ded5..f3d0ede787 100644
--- a/includes/AutoLoader.php
+++ b/includes/AutoLoader.php
@@ -48,6 +48,13 @@ class AutoLoader {
                        $wgAutoloadAttemptLowercase;
 
                $filename = false;
+               $trace = debug_backtrace();
+               //var_dump($trace);
+               $func = $trace[2]['function'] ?? '';
+               if ( $func === 'require' || $func === 'require_once') {
+                       $func = 'requiring ' . ( $trace[3]['args'][0] ?? 'unknown' );
+               }
+               file_put_contents( 'debug.log', ( $trace[2]['class'] ?? '' ) . '::' . $func . " triggered $className\n", FILE_APPEND );
 
                if ( isset( $wgAutoloadLocalClasses[$className] ) ) {
                        $filename = $wgAutoloadLocalClasses[$className];