dotnet/roslyn

need a better error message for invalid lambda capturing of ref-like types

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#22,058 opened on Sep 11, 2017

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Area-CompilersBugConcept-Diagnostic ClarityFeature - Readonly ReferencesLanguage-C#help wanted

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Description

See the use of ERR_AnonDelegateCantUseLocal

We are reusing the same errors for ref variables and for ref-like values. In the second case it could be confusing, although coming up with a better error is not easy. It should not at least say "ref" - that is not a problem here, probably "ref-like types"

Contributor guide

Research direction
Understand the current error message generation for ERR AnonDelegateCantUseLocal and identify where ref like types are involved. Propose a change to use a different error code or modify the message to refer to 'ref like types' instead of 'ref'.
Tech stack
csharp
Domain
developer experience
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C#Git
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45