dotnet/roslyn

Abstract properties are printed twice in C# Interactive

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#18,032 opened on Mar 21, 2017

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Area-InteractiveInteractive-ScriptingLogichelp wanted

Description

Version Used: VS2017 RTW

Steps to Reproduce:

Paste this code into C# Interactive window

abstract class B {
	public abstract int P { get; }
}
class C : B {
	public override int P => 0;
}
new C()

Expected Behavior:

Output equals:

Submission#0.C { P=0 }

Actual Behavior:

Submission#0.C { P=0, P=0 }

Contributor guide

Tech stack
csharp
Domain
tooling
Issue type
bug
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.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C#familiarity with Roslyn codebase
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
The bug is in C# Interactive's object display. Look for how the REPL formats objects, likely in the Microsoft.CodeAnalysis.CSharp.Scripting or formatting components. Check files related to object formatting, perhaps in the InteractiveHost or similar. The issue is that abstract properties are printed twice, so investigate the property enumeration logic.