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Do not complete shadowed intrinsic extension methods on objects with type-native methods - #28019
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Utpal Sen (senutpal) wants to merge 2 commits into
Open
Utpal Sen (senutpal) wants to merge 2 commits into
Utpal Sen (senutpal) wants to merge 2 commits into
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PowerShell provides intrinsic extension methods (.ForEach(), .Where(), .PSForEach(), .PSWhere()) on enumerable collections. When an object type already implements a native method of the same name (such as List<T>.ForEach(Action<T>)), PowerShell's dynamic binder always invokes the type-native method, making the intrinsic method unreachable. However, tab completion on instantiated collections returned both the type-native method and the intrinsic method, causing confusion. Update CompleteExtensionMethods to inspect the completion results list before injecting intrinsic extension methods. If a method with the same name already exists in the results (or among hidden type methods), the intrinsic method candidate is skipped. Properties sharing the same name are not treated as collisions and continue to be offered alongside the method. Additionally, in CompleteMemberByInferredType, move extension method completion outside the inferred type iteration loop and guard against static member completion. Fixes PowerShell#24729
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🟡 Changes recommended
Hidden native methods are not enumerated, so shadowed intrinsic completions may still appear.
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Pull request overview
Updates PowerShell tab completion to suppress intrinsic methods shadowed by native methods.
Changes:
- Filters conflicting intrinsic extension methods.
- Defers inferred-type completion and skips static members.
- Adds regression coverage.
File summaries
| File | Summary |
|---|---|
test/powershell/Host/TabCompletion/TabCompletion.Tests.ps1 |
Adds tab-completion regression tests. |
src/System.Management.Automation/engine/CommandCompletion/CompletionCompleters.cs |
Implements collision-aware extension method completion. |
Review details
Suppressed comments (4)
src/System.Management.Automation/engine/CommandCompletion/CompletionCompleters.cs:8824
PSObject.AsPSObject(value).Membersis enumerated withMshMemberMatchOptions.None, so its enumerator skips everyIsHiddenmember. This loop therefore can never populatehiddenMethods; a hidden nativeForEach/Wheremethod can still leave the intrinsic completion visible. Query the member collection withMembers.Match(..., MshMemberMatchOptions.IncludeHidden)(or otherwise enumerate hidden adapter members) and add a regression test for this path.
if (memberInfo is PSMethodInfo)
{
hiddenMethods ??= new List<string>();
hiddenMethods.Add(memberInfo.Name);
}
test/powershell/Host/TabCompletion/TabCompletion.Tests.ps1:167
$matchesis PowerShell's automatic regex-capture variable, so assigning the completion results to it can overwrite state used by later-matchoperations and violates the repository's automatic-variable naming rule. Use a descriptive name such as$completionMatchesthroughout this assertion block.
$forMatches = (TabExpansion2 -inputScript '[System.Collections.Generic.List[object]]::new().For').CompletionMatches
test/powershell/Host/TabCompletion/TabCompletion.Tests.ps1:226
$matchesis PowerShell's automatic regex-capture variable, so assigning the completion results to it can overwrite state used by later-matchoperations and violates the repository's automatic-variable naming rule. Use a descriptive name such as$completionMatchesthroughout this assertion block.
$cMatches = (TabExpansion2 -inputScript '$c.For').CompletionMatches
test/powershell/Host/TabCompletion/TabCompletion.Tests.ps1:248
$matchesis PowerShell's automatic regex-capture variable, so assigning the completion results to it can overwrite state used by later-matchoperations and violates the repository's automatic-variable naming rule. Use a descriptive name such as$completionMatchesthroughout this assertion block.
$whereMatches = (TabExpansion2 -inputScript '$c.Wh').CompletionMatches
- Files reviewed: 2/2 changed files
- Comments generated: 1
- Review effort level: Lite
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PR Summary
Fixes PowerShell issue #24729 where tab completion unexpectedly returned intrinsic extension methods (
.ForEach(),.Where(),.PSForEach(),.PSWhere()) on objects that already define a type-native method of the same name (e.g.,System.Collections.Generic.List<T>.ForEach(Action<T>)).Since PowerShell's method invocation binder always resolves and invokes the type-native method rather than the intrinsic extension method when a name collision occurs, offering the intrinsic method in tab completion is redundant and misleading.
With this change:
CompleteExtensionMethodschecks whether a method of the same name already exists inresults(or amonghiddenMethodsfor instance reflection) using case-insensitive ordinal matching. If present, the intrinsic method is omitted.ForEachproperty) are not treated as collisions, allowing both the property and intrinsic method to be completed.CompleteMemberByInferredType, intrinsic extension method completion is executed once after iterating all inferred types (rather than per-type within the loop), and is skipped for static member completion requests (!isStatic).PR Context
When working with collections that define their own methods with names matching PowerShell intrinsic extension methods (like
List<T>.ForEach), users pressing<Tab>on$list.Forreceived duplicate completion suggestions forForEach(:void ForEach(System.Action[System.Object] action)ForEach(expression [, arguments...])Attempting to invoke the intrinsic method signature results in a method binding failure because the type-native method takes precedence in PowerShell's binder. Filtering out shadowed intrinsic extension methods aligns tab completion with runtime dispatch behavior and eliminates confusion.
PR Checklist
.h,.cpp,.cs,.ps1and.psm1files have the correct copyright header