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docs: cleanup the explanation paragraphs at the start of each exercise.

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Robert Fry
2023-05-29 18:39:08 +01:00
parent 30291a3c25
commit 7eef5d15ee
95 changed files with 577 additions and 337 deletions
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36
exercises/error_handling/errors5.rs
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@@ -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