swiftlang/swift-package-manager

`containsAtMain` does not handle `@main` on the same line as a multi-line end comment

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#9685 opened on Feb 5, 2026

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good first issue

Description

The containsAtMain function call does not correctly return true with the following input

                /*
                This is a multi-line comment
                /* @main
                struct MyApp {
                    static func main() {
                        print("Hello, World!")
                    }
                }

Search for the GitHub issue in the swift-package-manager repository to located an impacted automated test

Contributor guide

Tech stack
swift
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.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Swiftmulti line comments
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70
Research direction
Look at the `containsAtMain` function in the source code. The issue is that it fails to detect `@main` when it appears on the same line as a multi line end comment. You may need to examine the relevant parsing logic and find the affected test case in the repository. The test likely has the same input pattern. Fix the function to correctly handle this case.