You are not correct. There is always only one number that is the first appearance

you renamed the function as format_seconds instead of make_readable, so obviously the tests do not work. that's a problem in your code and not a kata issue.

added

where ?

I'm getting this from the compiler when trying to run my code:

error[E0432]: unresolved import `super::make_readable`
  --> src/lib.rs:12:9
   |
12 |     use super::make_readable;
   |         ^^^^^^^^^^^^^^^^^^^^ no `make_readable` in the root

For more information about this error, try `rustc --explain E0432`.
error: could not compile `challenge` due to previous error


NOTE: Line numbers in error messages can be incorrect due to concatenation.

looks like there is an issue with an import that requires fixing.

In rust margin is not optional, which makes this kata a bit confusing as dealing with it as an optional argument won't compile.

No worries! As @trashy_incel said, maybe you just accidentally deleted an argument or something in the example tests.

hmm seems like I messed something up on my side then, sorry!

Looking at user's profile: 1 hour later the kata appears as completed OK in Python;

Therefore, closing issue - no problems with Python tests.

Python sample tests seem fine. are you sure you did not modify them inadvertently ? hit the Reset button to erase the local cache and try again

There is an error in the python implementation. One of the test cases throws the error 'positional argument missing'. It looks like the input string got deleted. It only affects the tests not the attempts.