Fix #2221 - variadic args are lists

src/Psalm/Internal/Analyzer/FunctionLikeAnalyzer.php

@@ -894,10 +894,7 @@ abstract class FunctionLikeAnalyzer extends SourceAnalyzer implements Statements
 
             if ($function_param->is_variadic) {
                 $var_type = new Type\Union([
-                    new Type\Atomic\TArray([
-                        Type::getInt(),
-                        $param_type,
-                    ]),
+                    new Type\Atomic\TList($param_type),
                 ]);
             }
 

tests/ArrayAssignmentTest.php

@@ -1236,6 +1236,20 @@ class ArrayAssignmentTest extends TestCase
                         return $arr;
                     }',
             ],
+            'unpackedArgIsList' => [
+                '<?php
+                    final class Values
+                    {
+                        /**
+                         * @psalm-var list<int>
+                         */
+                        private $ints = [];
+
+                        public function set(int ...$ints): void {
+                            $this->ints = $ints;
+                        }
+                    }'
+            ],
         ];
     }