additional3.toml

[[exercises]]
name = "generics1"
path = "exercises/14_generics/generics1.rs"
mode = "compile"
hint = """
Vectors in Rust make use of generics to create dynamically sized arrays of any
type.

You need to tell the compiler what type we are pushing onto this vector."""

[[exercises]]
name = "generics2"
path = "exercises/14_generics/generics2.rs"
mode = "test"
hint = """
Currently we are wrapping only values of type `u32`.

Maybe we could update the explicit references to this data type somehow?

If you are still stuck https://doc.rust-lang.org/stable/book/ch10-01-syntax.html#in-method-definitions
"""

[[exercises]]
name = "traits4"
path = "exercises/15_traits/traits4.rs"
mode = "test"
hint = """
Instead of using concrete types as parameters you can use traits. Try replacing
the '??' with 'impl <what goes here?>'

See the documentation at: https://doc.rust-lang.org/book/ch10-02-traits.html#traits-as-parameters
"""

[[exercises]]
name = "traits5"
path = "exercises/15_traits/traits5.rs"
mode = "compile"
hint = """
To ensure a parameter implements multiple traits use the '+ syntax'. Try
replacing the '??' with 'impl <> + <>'.

See the documentation at: https://doc.rust-lang.org/book/ch10-02-traits.html#specifying-multiple-trait-bounds-with-the--syntax
"""

[[exercises]]
name = "errors5"
path = "exercises/13_error_handling/errors5.rs"
mode = "compile"
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?

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.

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
"""

[[exercises]]
name = "quiz3"
path = "exercises/quiz3.rs"
mode = "test"
hint = """
To find the best solution to this challenge you're going to need to think back
to your knowledge of traits, specifically 'Trait Bound Syntax'

You may also need this: `use std::fmt::Display;`."""