Add BCHelper

src/Psalm/Internal/Analyzer/Statements/ExpressionAnalyzer.php

@@ -42,6 +42,7 @@
 use Psalm\Internal\Analyzer\Statements\Expression\YieldAnalyzer;
 use Psalm\Internal\Analyzer\Statements\Expression\YieldFromAnalyzer;
 use Psalm\Internal\Analyzer\StatementsAnalyzer;
+use Psalm\Internal\BCHelper;
 use Psalm\Internal\FileManipulation\FileManipulationBuffer;
 use Psalm\Internal\Type\TemplateResult;
 use Psalm\Issue\RiskyTruthyFalsyComparison;
@@ -456,7 +457,9 @@ private static function handleExpression(
             return MatchAnalyzer::analyze($statements_analyzer, $stmt, $context);
         }
 
-        if ($stmt instanceof PhpParser\Node\Expr\Throw_ && $analysis_php_version_id >= 8_00_00) {
+        if ($stmt instanceof PhpParser\Node\Expr\Throw_
+            && ($analysis_php_version_id >= 8_00_00 || !BCHelper::usePHPParserV4())
+        ) {
             return ThrowAnalyzer::analyze($statements_analyzer, $stmt, $context);
         }
 

src/Psalm/Internal/BCHelper.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Psalm\Internal;
+
+/**
+ * @internal
+ */
+final class BCHelper
+{
+    public static function usePHPParserV4(): bool
+    {
+        return class_exists('\PhpParser\Node\Stmt\Throw');
+    }
+}