Description

I have a package with an executable target, and a test target. The tests in the test target do a @testable import of the executable target. The main target has a @main struct ....

Running swift test works on macOS and Linux.
Running swift test on Windows fails.

Expected behavior

When running swift test on Windows, the tests run.

Actual behavior

When running swift test on windows, it fails with an error at link time:

lld-link: error: duplicate symbol: main
>>> defined at C:\\...\\MyPackageTests.build\\runner.swift.o
>>> defined at C:\\...\\MyPackage\\MyMainStruct.swift.o

Steps to reproduce

No response

Swift Package Manager version/commit hash

version included in the official Swift download for Windows

Swift & OS version (output of swift --version && uname -a)

Swift: 5.8
OS: Microsoft Windows Server 2022

(also happens on other versions of swift and OS).