Add and update tests for IndexMut help message

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Lukas Kalbertodt 2018-08-07 23:09:08 +02:00
parent 764d472b1f
commit 24abef3689
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@ -0,0 +1,22 @@
error[E0596]: cannot borrow data in a `&` reference as mutable
--> $DIR/index-mut-help.rs:21:5
|
LL | map["peter"].clear(); //~ ERROR
| ^^^^^^^^^^^^ cannot borrow as mutable
error[E0594]: cannot assign to data in a `&` reference
--> $DIR/index-mut-help.rs:22:5
|
LL | map["peter"] = "0".to_string(); //~ ERROR
| ^^^^^^^^^^^^ cannot assign
error[E0596]: cannot borrow data in a `&` reference as mutable
--> $DIR/index-mut-help.rs:23:13
|
LL | let _ = &mut map["peter"]; //~ ERROR
| ^^^^^^^^^^^^^^^^^ cannot borrow as mutable
error: aborting due to 3 previous errors
Some errors occurred: E0594, E0596.
For more information about an error, try `rustc --explain E0594`.

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// Copyright 2018 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.
// When mutably indexing a type that implements `Index` but not `IndexMut`, a
// special 'help' message is added to the output.
fn main() {
use std::collections::HashMap;
let mut map = HashMap::new();
map.insert("peter", "23".to_string());
map["peter"].clear(); //~ ERROR
map["peter"] = "0".to_string(); //~ ERROR
let _ = &mut map["peter"]; //~ ERROR
}

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error[E0596]: cannot borrow immutable indexed content as mutable
--> $DIR/index-mut-help.rs:21:5
|
LL | map["peter"].clear(); //~ ERROR
| ^^^^^^^^^^^^ cannot borrow as mutable
|
= help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `std::collections::HashMap<&str, std::string::String>`
error[E0594]: cannot assign to immutable indexed content
--> $DIR/index-mut-help.rs:22:5
|
LL | map["peter"] = "0".to_string(); //~ ERROR
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
|
= help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `std::collections::HashMap<&str, std::string::String>`
error[E0596]: cannot borrow immutable indexed content as mutable
--> $DIR/index-mut-help.rs:23:18
|
LL | let _ = &mut map["peter"]; //~ ERROR
| ^^^^^^^^^^^^ cannot borrow as mutable
|
= help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `std::collections::HashMap<&str, std::string::String>`
error: aborting due to 3 previous errors
Some errors occurred: E0594, E0596.
For more information about an error, try `rustc --explain E0594`.

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@ -3,6 +3,8 @@ error[E0596]: cannot borrow immutable indexed content as mutable
|
LL | things[src.as_str()].sort(); //~ ERROR cannot borrow immutable
| ^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
|
= help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `std::collections::HashMap<std::string::String, std::vec::Vec<std::string::String>>`
error: aborting due to previous error