@ -893,7 +893,19 @@ path = "exercises/conversions/try_from_into.rs"
mode = "test"
hint = "" "
Follow the steps provided right before the ` TryFrom ` implementation .
You can also use the example at https : / / doc . rust-lang . org / std / convert / trait . TryFrom . html "" "
You can also use the example at https : / / doc . rust-lang . org / std / convert / trait . TryFrom . html
You might want to look back at the exercise errorsn ( or its hints ) to remind
yourself about how ` Box < dyn Error > ` works .
If you ' re trying to return a string as an error , note that neither ` str `
nor ` String ` implements ` error : : Error ` . However , there is an implementation
of ` From < & str > ` for ` Box < dyn Error > ` . This means you can use ` . into ( ) ` or
the ` ? ` operator to convert your string into the correct error type .
If you ' re having trouble with using the ` ? ` operator to convert an error string ,
recall that ` ? ` works to convert ` Err ( something ) ` into the appropriate error
type for returning from the function . "" "
[ [ exercises ] ]
name = "as_ref_mut"
@ -909,4 +921,7 @@ mode = "test"
hint = "" "
The implementation of FromStr should return an Ok with a Person object ,
or an Err with an error if the string is not valid .
This is almost like the ` try_from_into ` exercise . "" "
This is almost like the ` try_from_into ` exercise .
If you ' re having trouble with returning the correct error type , see the
hints for try_from_into . "" "