traits2 solution

rustlings-macros/info.toml

@@ -755,21 +755,18 @@ https://doc.rust-lang.org/stable/book/ch10-01-syntax.html#in-method-definitions"
 name = "traits1"
 dir = "15_traits"
 hint = """
-A discussion about Traits in Rust can be found at:
-https://doc.rust-lang.org/book/ch10-02-traits.html
-"""
+More about traits in The Book:
+https://doc.rust-lang.org/book/ch10-02-traits.html"""
 
 [[exercises]]
 name = "traits2"
 dir = "15_traits"
 hint = """
-Notice how the trait takes ownership of `self`, and returns `Self`.
+Notice how the trait takes ownership of `self` and returns `Self`.
 
-Try mutating the incoming string vector. Have a look at the tests to see
-what the result should look like!
-
-Vectors provide suitable methods for adding an element at the end. See
-the documentation at: https://doc.rust-lang.org/std/vec/struct.Vec.html"""
+Although the signature of `append_bar` in the trait takes `self` as argument,
+the implementation can take `mut self` instead. This is possible because the
+the value is owned anyway."""
 
 [[exercises]]
 name = "traits3"