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confusing compile error for second partial borrows of/from Boxes, refers to members rather than box itself #17263

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#17434
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confusing compile error for second partial borrows of/from Boxes, refers to members rather than box itself#17263
#17434

Description

@makoConstruct
makoConstruct
opened on Sep 15, 2014
struct Thing{  a: u8,  b: u8  }
fn main(){
  let mut boxed_thing = box Thing{a:2, b:2};
  let btr = &mut boxed_thing;
  let (a, b) = (&mut btr.a, &mut btr.b);
    //error: cannot borrow `btr.b` as mutable more than once at a time
    //note: previous borrow of `btr.a` occurs here; the mutable borrow prevents subsequent moves, borrows, or modification of `btr.a` until the borrow ends
    //let (a, b) = (&mut btr.a, &mut btr.b);
    //                   ^~~~~
}

Activity

  1. makoConstruct
    changed the title [-]confusing compile error for second partial moves(?) from Boxes, refers to second member rather than box itself[/-] [+]confusing compile error for second partial moves(?) from Boxes, refers to members rather than box itself[/+] on Sep 15, 2014
  2. makoConstruct
    changed the title [-]confusing compile error for second partial moves(?) from Boxes, refers to members rather than box itself[/-] [+]confusing compile error for second partial borrows of/from Boxes, refers to members rather than box itself[/+] on Sep 15, 2014
  3. bors
    added a commit that references this issue on Oct 2, 2014

    auto merge of #17434 : P1start/rust/borrowck-messages, r=nikomatsakis

    84a4a07
  4. bors
    closed this as completedin #17434on Oct 2, 2014

  5. pnkfelix commented on Nov 6, 2018

    @pnkfelix
    pnkfelix
    on Nov 6, 2018
    Contributor

    see also some follow-up discussion here #43234 (comment)

  6. lnicola
    added a commit that references this issue on Sep 25, 2024

    Auto merge of rust-lang#18018 - ChayimFriedman2:unit-ret-complete-sem…

    97907ca
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