Macros exercise missing checks

[yulin-physics]

More tests could be added for the Macros exercise, one specific case I found is when there is no separator between fragments current test set still passes e.g.

HashMap<u32, u32> = hashmap!(1=>1 1=>1);

For the top community solution with the hashmap macro definition:

#[macro_export]
macro_rules! hashmap {
    ($( $key: expr => $val: expr )+$(,)?) => {{
         let mut map = ::std::collections::HashMap::new();
         $( map.insert($key, $val); )*
         map
    }}
}

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[senekor]

@yulin-physics This solution already doesn't compile for me locally. It's not the top one in the community solution either, maybe it has changed in the meantime. Maybe you can provide a link?

Either way, I think there actually is already a test for missing commas(?) https://github.com/exercism/rust/blob/main/exercises/practice/macros/tests/invalid/no-comma.rs

[yulin-physics]

@senekor Does look like the "invalid" solution disappeared from community solutions and no longer passes the tests, I'm happy for you to close this issue : ) Thank you!