dotnet/roslyn

Constant folding isn't done when interpolated string contains at least one variable

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#65,636 opened on Nov 28, 2022

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

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Description

Version Used: Not sure, whatever sharplab/Default is at.

Steps to Reproduce:

Explained in this sharplab snippet

Expected Behavior:

The left side of the string is constant folded in the optimized version.

Actual Behavior:

The left side of the string is not constant folded in the optimized version, generating InterpolatedStringHandler operations for what are constant strings

Contributor guide

Research direction
Investigate the constant folding logic for interpolated string handlers in the Roslyn compiler. Look at the lowering pass where InterpolatedStringHandler operations are generated and determine why constant substrings are not being folded.
Tech stack
csharp
Domain
backend
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.
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#compiler development
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30