dotnet/roslyn

Poor error message when calling a member of a newly constructed object in VB

Open

#38,308 opened on Aug 27, 2019

View on GitHub
 (1 comment) (0 reactions) (0 assignees)C# (20,414 stars) (4,257 forks)batch import
Area-CompilersBugConcept-Diagnostic ClarityLanguage-VBhelp wanted

Description

Version Used: master Steps to Reproduce:

compile the following code:

Public Module Program
    Public Sub Main()
        New string("").Clone()
    End Sub
End Module

Expected Behavior:

A useful error message, explaining that you need to use Call New string("").Clone()

Actual Behavior:

error BC30035: Syntax error.

Contributor guide

Tech stack
None
Domain
toolingdeveloper experience
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.
under 1 hour
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
Roslyn compiler internalsVB.NET syntax
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Search for error code 'BC30035' in the Roslyn codebase to locate where Syntax error is reported for VB. Review similar error messages for newly constructed objects (e.g., C# equivalent) to understand the pattern. The fix likely involves adding a specific error message in the VB binding or parsing layer, such as in BoundExpression or SyntaxFacts. No linked PRs or recent comments provide further guidance.