diff options
Diffstat (limited to 'exercises/error_handling/errors5.rs')
| -rw-r--r-- | exercises/error_handling/errors5.rs | 36 |
1 files changed, 21 insertions, 15 deletions
diff --git a/exercises/error_handling/errors5.rs b/exercises/error_handling/errors5.rs index eb5506c..92461a7 100644 --- a/exercises/error_handling/errors5.rs +++ b/exercises/error_handling/errors5.rs @@ -1,20 +1,26 @@ // errors5.rs - +// // This program uses an altered version of the code from errors4. - -// This exercise uses some concepts that we won't get to until later in the course, like `Box` and the -// `From` trait. It's not important to understand them in detail right now, but you can read ahead if you like. -// For now, think of the `Box<dyn ???>` type as an "I want anything that does ???" type, which, given -// Rust's usual standards for runtime safety, should strike you as somewhat lenient! - -// In short, this particular use case for boxes is for when you want to own a value and you care only that it is a -// type which implements a particular trait. To do so, The Box is declared as of type Box<dyn Trait> where Trait is the trait -// the compiler looks for on any value used in that context. For this exercise, that context is the potential errors -// which can be returned in a Result. - -// What can we use to describe both errors? In other words, is there a trait which both errors implement? - -// Execute `rustlings hint errors5` or use the `hint` watch subcommand for a hint. +// +// This exercise uses some concepts that we won't get to until later in the +// course, like `Box` and the `From` trait. It's not important to understand +// them in detail right now, but you can read ahead if you like. For now, think +// of the `Box<dyn ???>` type as an "I want anything that does ???" type, which, +// given Rust's usual standards for runtime safety, should strike you as +// somewhat lenient! +// +// In short, this particular use case for boxes is for when you want to own a +// value and you care only that it is a type which implements a particular +// trait. To do so, The Box is declared as of type Box<dyn Trait> where Trait is +// the trait the compiler looks for on any value used in that context. For this +// exercise, that context is the potential errors which can be returned in a +// Result. +// +// What can we use to describe both errors? In other words, is there a trait +// which both errors implement? +// +// Execute `rustlings hint errors5` or use the `hint` watch subcommand for a +// hint. // I AM NOT DONE |