Bug 6119 - CS0414 when field only used in expression argument
Summary: CS0414 when field only used in expression argument
Status: RESOLVED FIXED
Alias: None
Product: Compilers
Classification: Mono
Component: C# ()
Version: unspecified
Hardware: All All
: --- normal
Target Milestone: ---
Assignee: Marek Safar
URL:
Depends on:
Blocks:
 
Reported: 2012-07-13 18:24 UTC by David Straw
Modified: 2012-07-16 08:17 UTC (History)
1 user (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Status:
RESOLVED FIXED

Description David Straw 2012-07-13 18:24:47 UTC
A CS0414 warning (unused private field) is generated when the only use of a field is inside of a delegate that gets accepted as an expression tree by the target.

Simple test case:

// Repro.cs
using System;
using System.Linq.Expressions;

namespace UnusedFieldWarningTest
{
  class Repro
  {
    int i = 0;
    void UseField()
    {
      TakeExpression(() => Console.Write(i));
    }
    void TakeExpression(Expression<Action> expr) { }
  }
}
Comment 1 Marek Safar 2012-07-16 08:17:54 UTC
Fixed in master