Update FFI tutorial to reference c_str::to_c_str
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The FFI tutorial still incorrectly stated that strings were terminated with \0 and suggested using `str::as_c_str`.
bors
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Aug 23, 2013
The FFI tutorial still incorrectly stated that strings were terminated with
flip1995
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Apr 21, 2022
… r=giraffate
fix unnecessary_to_owned about msrv
This PR fixes ``[`unnecessary_owned`]``.
## What
```rust
# sample code
fn _msrv_1_35() {
#![clippy::msrv = "1.35"]
let _ = &["x"][..].to_vec().into_iter();
}
fn _msrv_1_36() {
#![clippy::msrv = "1.36"]
let _ = &["x"][..].to_vec().into_iter();
}
```
If we will check this code using clippy, ``[`unnecessary_owned`]`` will modify the code as follows.
```rust
error: unnecessary use of `to_vec`
--> $DIR/unnecessary_to_owned.rs:219:14
|
LL | let _ = &["x"][..].to_vec().into_iter();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `["x"][..].iter().copied()`
error: unnecessary use of `to_vec`
--> $DIR/unnecessary_to_owned.rs:224:14
|
LL | let _ = &["x"][..].to_vec().into_iter();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `["x"][..].iter().copied()`
```
This is incorrect. Because `Iterator::copied` was estabilished in 1.36.
## Why
This bug was caused by not separating "copied" and "clone" by reference to msrv.
https://github.com/rust-lang/rust-clippy/blob/89ee6aa6e32df974ef9dbb3c825afbdce441e856/clippy_lints/src/methods/unnecessary_to_owned.rs#L195
So, I added a conditional branch and described the corresponding test.
Thank you in advance.
changelog: fix wrong suggestions about msrv in [`unnecessary_to_owned`]
r! `@giraffate`
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The FFI tutorial still incorrectly stated that strings were terminated
with \0 and suggested using
str::as_c_str.