Add more underscores to f_equiv
lambda-rust!21 (comment 64914) requires a version of f_equiv with 5 underscores instead of 4. This is the minimal patch to fulfil this usecase, but we could add even more underscores while we are at it.
lambda-rust!21 (comment 64914) requires a version of f_equiv with 5 underscores instead of 4. This is the minimal patch to fulfil this usecase, but we could add even more underscores while we are at it.