Fix parsing for array literals in index expressions in method calls (#19224)

src/System.Management.Automation/engine/parser/Parser.cs

@@ -7962,7 +7962,18 @@ namespace System.Management.Automation.Language
             // G      primary-expression   '['   new-lines:opt   expression   new-lines:opt   ']'
 
             SkipNewlines();
-            ExpressionAst indexExpr = ExpressionRule();
+            bool oldDisableCommaOperator = _disableCommaOperator;
+            _disableCommaOperator = false;
+            ExpressionAst indexExpr = null;
+            try
+            {
+                indexExpr = ExpressionRule();
+            }
+            finally
+            {
+                _disableCommaOperator = oldDisableCommaOperator;
+            }
+
             if (indexExpr == null)
             {
                 // ErrorRecovery: hope we see a closing bracket.  If we don't, we'll pretend we saw

test/powershell/Language/Parser/Parsing.Tests.ps1

@@ -665,6 +665,15 @@ Describe "Parsing using statement with alias and linebreak and comma" -Tag CI {
     }
 }
 
+It "Should correctly parse array literals for index expressions in method calls" {
+    $tks = $null
+    $ers = $null
+    $Script = '[string]::join(" ", (0, 1, 2)[0, 1])'
+    $result = [System.Management.Automation.Language.Parser]::ParseInput($Script, [ref]$tks, [ref]$ers)
+    $result.EndBlock.Statements[0].PipelineElements[0].Expression.Arguments[1].Index.Elements.Count | Should -Be 2
+    $ers.Count | Should -Be 0
+}
+
 It "Should correctly parse array types that are used as arguments without brackets in generic type" {
     $tks = $null
     $ers = $null