diff options
Diffstat (limited to 'rustlings-macros/info.toml')
| -rw-r--r-- | rustlings-macros/info.toml | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/rustlings-macros/info.toml b/rustlings-macros/info.toml index d39044c..700c179 100644 --- a/rustlings-macros/info.toml +++ b/rustlings-macros/info.toml @@ -692,24 +692,23 @@ name = "errors5" dir = "13_error_handling" test = false hint = """ -There are two different possible `Result` types produced within `main()`, which -are propagated using `?` operators. How do we declare a return type from -`main()` that allows both? +There are two different possible `Result` types produced within the `main` +function, which are propagated using the `?` operators. How do we declare a +return type for the `main` function that allows both? Under the hood, the `?` operator calls `From::from` on the error value to -convert it to a boxed trait object, a `Box<dyn error::Error>`. This boxed trait -object is polymorphic, and since all errors implement the `error::Error` trait, -we can capture lots of different errors in one "Box" object. +convert it to a boxed trait object, a `Box<dyn Error>`. This boxed trait object +is polymorphic, and since all errors implement the `Error` trait, we can capture +lots of different errors in one `Box` object. -Check out this section of the book: +Check out this section of The Book: https://doc.rust-lang.org/book/ch09-02-recoverable-errors-with-result.html#a-shortcut-for-propagating-errors-the--operator Read more about boxing errors: https://doc.rust-lang.org/stable/rust-by-example/error/multiple_error_types/boxing_errors.html Read more about using the `?` operator with boxed errors: -https://doc.rust-lang.org/stable/rust-by-example/error/multiple_error_types/reenter_question_mark.html -""" +https://doc.rust-lang.org/stable/rust-by-example/error/multiple_error_types/reenter_question_mark.html""" [[exercises]] name = "errors6" |