typelevel/cats

Clean out warnings from Dotty

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#3,751 opened on Jan 30, 2021

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 (2 comments) (0 reactions) (0 assignees)Scala (5,438 stars) (1,241 forks)batch import
good first issuelsug

Description

There's a bunch of warnings that Dotty emits, e.g. type tests that cannot be checked at runtime.

I suspect many of them can be resolved in a way that are compatible with Scala 2.

Contributor guide

Tech stack
None
Domain
backend
Issue type
refactor
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.
1-2 days
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.
needs investigation
Prerequisites
Scala
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
The issue mentions cleaning warnings from Dotty (Scala 3) but provides no specific examples. First, investigate the current warnings by building the project with Scala 3. Search the codebase for common warnings like unchecked type tests or match exhaustiveness. Check if there are any existing PRs or branches addressing this. Consider commenting on the issue to ask for clarification on which warnings are prioritized.
Clean out warnings from Dotty · typelevel/cats#3751 | Good First Issue