Add a test case about overriding the prelude #3
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Thanks, @nomeata. This PR has revealed that CI wasn't set up properly for PRs from forks. I've pulled out your changes to the file layout, and fixed CI, and then rebased your PR back onto All that remains here is the failing test. |
Probably not unexpected but without further protection against the `prelude` command, one can easily prove unsound things, as this test demonstrates. It seems that either `lean4checker` should somehow ensure that only an official prelude is used, or else the kernel (which implements `Nat.add` differently) should check that the definition is indeed as expected. I had to restructure the tests into their own library with a `glob`, as _importing_ this file from another file that also imports the normal prelude seems to fail with ``` ./././Lean4CheckerTests.lean:1:0: error: import Lean4CheckerTests.OverridenPrelude failed, environment already contains 'Eq.refl' from Init.Prelude ```
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This is well known, but but without further protection against the
preludecommand, one can easily prove unsound things, as this testdemonstrates.
Until the kernel itself is guarded against this (tracked at
leanprover/lean4#188), I wonder if
lean4checkershould havea defense, and warn if
preludeis used, or something along these lines?I had to restructure the tests into their own library with a
glob, asimporting this file from another file that also imports the normal
prelude seems to fail with