errorsn.rs: Separate hints from code, so hints are not accidentally seen

Signed-off-by: Eddy Petrisor <[email protected]>

Author: eddyp

exercises/error_handling/errorsn.rs

@@ -108,6 +108,36 @@ impl error::Error for CreationError {
     }
 }
 
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 // First hint: To figure out what type should go where the ??? is, take a look
 // at the test helper function `test_with_str`, since it returns whatever
 // `read_and_validate` returns and`test_with_str` has its signature fully