Merge-module command failed due to signal 6

Using Swift
1

The project works with OSX but not Ubuntu.
I have tried dropping the OptionOneCollection and still saying the same error.

2

Definitely a bug! Please file at https://bugs.swift.org. (I assume/hope this is a project you can share?)

3

I have file the bug: [SR-7625] Merge-module command failed due to signal 6 · Issue #50167 · apple/swift · GitHub

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