diff options
| author | marisa <mokou@posteo.de> | 2019-11-11 16:51:38 +0100 |
|---|---|---|
| committer | marisa <mokou@posteo.de> | 2019-11-11 16:51:38 +0100 |
| commit | 9bdb0a12e45a8e9f9f6a4bd4a9c172c5376c7f60 (patch) | |
| tree | 3c4a094d57ecedf9706e0ba567a9f157590177c8 /exercises/move_semantics/move_semantics2.rs | |
| parent | 627cdc07d07dfe6a740e885e0ddf6900e7ec336b (diff) | |
feat: Refactor hint system
Hints are now accessible using the CLI subcommand `rustlings hint
<exercise name`.
BREAKING CHANGE: This fundamentally changes the way people interact with exercises.
Diffstat (limited to 'exercises/move_semantics/move_semantics2.rs')
| -rw-r--r-- | exercises/move_semantics/move_semantics2.rs | 31 |
1 files changed, 2 insertions, 29 deletions
diff --git a/exercises/move_semantics/move_semantics2.rs b/exercises/move_semantics/move_semantics2.rs index f85b3ed..b945042 100644 --- a/exercises/move_semantics/move_semantics2.rs +++ b/exercises/move_semantics/move_semantics2.rs @@ -1,5 +1,6 @@ // move_semantics2.rs -// Make me compile without changing line 10! Scroll down for hints :) +// Make me compile without changing line 10! +// Execute `rustlings hint move_semantics2` for hints :) fn main() { let vec0 = Vec::new(); @@ -23,31 +24,3 @@ fn fill_vec(vec: Vec<i32>) -> Vec<i32> { vec } - - - - - - - - - - - - - - -// So `vec0` is being *moved* into the function `fill_vec` when we call it on -// line 7, which means it gets dropped at the end of `fill_vec`, which means we -// can't use `vec0` again on line 10 (or anywhere else in `main` after the -// `fill_vec` call for that matter). We could fix this in a few ways, try them -// all! -// 1. Make another, separate version of the data that's in `vec0` and pass that -// to `fill_vec` instead. -// 2. Make `fill_vec` borrow its argument instead of taking ownership of it, -// and then copy the data within the function in order to return an owned -// `Vec<i32>` -// 3. Make `fill_vec` *mutably* borrow its argument (which will need to be -// mutable), modify it directly, then not return anything. Then you can get rid -// of `vec1` entirely -- note that this will change what gets printed by the -// first `println!` |