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Point to let when modifying field of immutable variable
Point at the immutable local variable when trying to modify one of its fields. Given a file: ```rust struct Foo { pub v: Vec<String> } fn main() { let f = Foo { v: Vec::new() }; f.v.push("cat".to_string()); } ``` present the following output: ``` error: cannot borrow immutable field `f.v` as mutable --> file.rs:7:13 | 6 | let f = Foo { v: Vec::new() }; | - this should be `mut` 7 | f.v.push("cat".to_string()); | ^^^ error: aborting due to previous error ```
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