[joshka]

Fair point on medium - this was a lazy example.

Substitutibility probably doesn't apply here in the way you're implying and if it did it would likely be hampered by the 9th circuits findings about transformation in sony v connectix. Arguments here likely would look at rust not having a stable ABI, and hence not being inherently substitutable as a libray (grit-lib), less clear as an executable (grit-cli) on that side

basics of copyright law - the fundamental thing being protected is the expression... is a rust program's expression the same expression as a c program? I'd say generally not.

[NewJazz]

The test suite could test aspects of the architecture/design of the codebase that are not necessary for interoperability and constitute novel expression of a piece of software in a way that is not at all language specific.

[joshka]

By definition a test suite is about testing interoperability with the test suite. An HTTP test suite should likely test for whether response code 418 is implemented a particular way and while humorous it would still be an interop test no?

[Conan_Kudo]

No, the git test suite is about testing the git codebase. If you want something like that, you need a conformance suite, which does not exist for git.