dotnet/roslyn

IntelliSense complaining about not being able to find a type at assignment to "var"

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#11,084 opened on May 5, 2016

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 (2 comments) (0 reactions) (0 assignees)C# (4,257 forks)batch import
Area-CompilersBugConcept-Diagnostic Clarityhelp wanted

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Description

Not sure if this by design, but it feels wrong - there's nothing I can do resolve this at the callsite:

image

The real problem is the declaration:

image

I can get together a repro (it's convoluted), but just wanted to confirm if this by design or not.

Contributor guide

Research direction
Examine how the compiler resolves types in 'var' declarations, specifically when a complex expression returns a type that may be ambiguous. Look at the binder code for variable declarations and IntelliSense logic.
Tech stack
csharp
Domain
compilers
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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.
Mostly clear
Prerequisites
C#
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40