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Suggest using slice when encountering
let x = ""[..];
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Original file line number | Diff line number | Diff line change |
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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
|
||
fn main() { | ||
let s = "abc"; | ||
let t = if true { s[..2] } else { s }; | ||
let u: &str = if true { s[..2] } else { s }; | ||
let v = s[..2]; | ||
let w: &str = s[..2]; | ||
} |
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error[E0308]: if and else have incompatible types | ||
--> $DIR/str-array-assignment.rs:13:11 | ||
| | ||
13 | let t = if true { s[..2] } else { s }; | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected str, found &str | ||
| | ||
= note: expected type `str` | ||
found type `&str` | ||
|
||
error[E0308]: mismatched types | ||
--> $DIR/str-array-assignment.rs:14:27 | ||
| | ||
11 | fn main() { | ||
| - expected `()` because of default return type | ||
... | ||
14 | let u: &str = if true { s[..2] } else { s }; | ||
| ^^^^^^ expected &str, found str | ||
| | ||
= note: expected type `&str` | ||
found type `str` | ||
|
||
error[E0277]: the trait bound `str: std::marker::Sized` is not satisfied | ||
--> $DIR/str-array-assignment.rs:15:7 | ||
| | ||
15 | let v = s[..2]; | ||
| ^ ------ help: consider a slice instead: `&s[..2]` | ||
| | | ||
| `str` does not have a constant size known at compile-time | ||
| | ||
= help: the trait `std::marker::Sized` is not implemented for `str` | ||
= note: all local variables must have a statically known size | ||
|
||
error[E0308]: mismatched types | ||
--> $DIR/str-array-assignment.rs:16:17 | ||
| | ||
16 | let w: &str = s[..2]; | ||
| ^^^^^^ expected &str, found str | ||
| | ||
= note: expected type `&str` | ||
found type `str` | ||
= help: try with `&s[..2]` | ||
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error: aborting due to 4 previous errors | ||
|