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-rw-r--r--exercises/14_generics/generics1.rs19
1 files changed, 15 insertions, 4 deletions
diff --git a/exercises/14_generics/generics1.rs b/exercises/14_generics/generics1.rs
index c023e64..87ed990 100644
--- a/exercises/14_generics/generics1.rs
+++ b/exercises/14_generics/generics1.rs
@@ -1,7 +1,18 @@
-// This shopping list program isn't compiling! Use your knowledge of generics to
-// fix it.
+// `Vec<T>` is generic over the type `T`. In most cases, the compiler is able to
+// infer `T`, for example after pushing a value with a concrete type to the vector.
+// But in this exercise, the compiler needs some help through a type annotation.
fn main() {
- let mut shopping_list: Vec<?> = Vec::new();
- shopping_list.push("milk");
+ // TODO: Fix the compiler error by annotating the type of the vector
+ // `Vec<T>`. Choose `T` as some integer type that can be created from
+ // `u8` and `i8`.
+ let mut numbers = Vec::new();
+
+ // Don't change the lines below.
+ let n1: u8 = 42;
+ numbers.push(n1.into());
+ let n2: i8 = -1;
+ numbers.push(n2.into());
+
+ println!("{numbers:?}");
}