Add and update tests for IndexMut
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src/test/ui/borrowck/index-mut-help.nll.stderr
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src/test/ui/borrowck/index-mut-help.nll.stderr
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/index-mut-help.rs:21:5
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LL | map["peter"].clear(); //~ ERROR
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| ^^^^^^^^^^^^ cannot borrow as mutable
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error[E0594]: cannot assign to data in a `&` reference
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--> $DIR/index-mut-help.rs:22:5
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LL | map["peter"] = "0".to_string(); //~ ERROR
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| ^^^^^^^^^^^^ cannot assign
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/index-mut-help.rs:23:13
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LL | let _ = &mut map["peter"]; //~ ERROR
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| ^^^^^^^^^^^^^^^^^ cannot borrow as mutable
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error: aborting due to 3 previous errors
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Some errors occurred: E0594, E0596.
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For more information about an error, try `rustc --explain E0594`.
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src/test/ui/borrowck/index-mut-help.rs
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src/test/ui/borrowck/index-mut-help.rs
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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// When mutably indexing a type that implements `Index` but not `IndexMut`, a
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// special 'help' message is added to the output.
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fn main() {
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use std::collections::HashMap;
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let mut map = HashMap::new();
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map.insert("peter", "23".to_string());
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map["peter"].clear(); //~ ERROR
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map["peter"] = "0".to_string(); //~ ERROR
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let _ = &mut map["peter"]; //~ ERROR
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}
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src/test/ui/borrowck/index-mut-help.stderr
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src/test/ui/borrowck/index-mut-help.stderr
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error[E0596]: cannot borrow immutable indexed content as mutable
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--> $DIR/index-mut-help.rs:21:5
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LL | map["peter"].clear(); //~ ERROR
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| ^^^^^^^^^^^^ cannot borrow as mutable
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= help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `std::collections::HashMap<&str, std::string::String>`
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error[E0594]: cannot assign to immutable indexed content
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--> $DIR/index-mut-help.rs:22:5
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LL | map["peter"] = "0".to_string(); //~ ERROR
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
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= help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `std::collections::HashMap<&str, std::string::String>`
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error[E0596]: cannot borrow immutable indexed content as mutable
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--> $DIR/index-mut-help.rs:23:18
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LL | let _ = &mut map["peter"]; //~ ERROR
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| ^^^^^^^^^^^^ cannot borrow as mutable
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= help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `std::collections::HashMap<&str, std::string::String>`
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error: aborting due to 3 previous errors
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Some errors occurred: E0594, E0596.
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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
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LL | things[src.as_str()].sort(); //~ ERROR cannot borrow immutable
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| ^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
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= 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>>`
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error: aborting due to previous error
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