vimeo/psalm

TypeDoesNotContainType - 5:4 - Cannot resolve types for $str2 - non-empty-lowercase-string does not contain non-falsy-string

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#9,733 opened on May 3, 2023

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Help wantedbugeasy problems

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Description

In the following example https://psalm.dev/r/95834da943 I expect to see no errors. A non-falsy-string should be comparable to lowercase-string.

Contributor guide

Research direction
Reproduce the issue using the provided Psalm playground link. Trace the type resolution logic in Psalm's type inference system, specifically how non falsy string and non empty lowercase string are compared. Check the relevant code that handles type containment checks.
Tech stack
php
Domain
tooling
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.
1-3 hours
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
PHP
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40