`val print : 'f fun_ Print.t`

`print f` prints the implementation of generated function `f`.

The implementation always contains a default case, represented as `_`.

Note that printing a function before it was called in the test may not print the full implementation.

`val apply : 'f fun_ -> 'f`

`apply f` returns the underlying function to be used in tests. This is an alias for deconstructing as documented in `fun_`.