[DowngradePhp80] Handle Throw Exception on DowngradeMatchToSwitchRector (#1019)

* Add failing test fixture for DowngradeMatchToSwitchRector + DowngradeThrowExprRector

# Failing Test for DowngradeMatchToSwitchRector + DowngradeThrowExprRector

Based on https://getrector.org/demo/1ec2fda5-2490-6c56-9d12-93cf2aafeb8a

* update fixture

* Closes #1018 Fixes https://github.com/rectorphp/rector/issues/6750

* [ci-review] Rector Rectify

Co-authored-by: Leonardo Losoviz <leo@getpop.org>
Co-authored-by: GitHub Action <action@github.com>

rules-tests/DowngradePhp80/Rector/Expression/DowngradeMatchToSwitchRector/Fixture/throw_expression.php.inc

@@ -0,0 +1,38 @@
+<?php
+
+namespace Rector\Tests\DowngradePhp80\Rector\Expression\DowngradeMatchToSwitchRector\Fixture;
+
+final class DemoFile
+{
+    public function run($param)
+    {
+        return match ($param) {
+            'a' => 'hi',
+            'b' => 'bye',
+            default => throw new Exception('no salutation'),
+        };
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\DowngradePhp80\Rector\Expression\DowngradeMatchToSwitchRector\Fixture;
+
+final class DemoFile
+{
+    public function run($param)
+    {
+        switch ($param) {
+            case 'a':
+                return 'hi';
+            case 'b':
+                return 'bye';
+            default:
+                throw new Exception('no salutation');
+        }
+    }
+}
+
+?>

rules/DowngradePhp80/Rector/Expression/DowngradeMatchToSwitchRector.php

@@ -9,6 +9,7 @@ use PhpParser\Node\Expr;
 use PhpParser\Node\Expr\ArrayItem;
 use PhpParser\Node\Expr\Assign;
 use PhpParser\Node\Expr\Match_;
+use PhpParser\Node\Expr\Throw_;
 use PhpParser\Node\MatchArm;
 use PhpParser\Node\Stmt;
 use PhpParser\Node\Stmt\Break_;
@@ -163,7 +164,9 @@ CODE_SAMPLE
     {
         $stmts = [];
 
-        if ($node instanceof Expression) {
+        if ($matchArm->body instanceof Throw_) {
+            $stmts[] = new Expression($matchArm->body);
+        } elseif ($node instanceof Expression) {
             /** @var Assign $assign */
             $assign = $node->expr;
             $stmts[] = new Expression(new Assign($assign->var, $matchArm->body));