src/test/ui/nll/extra-unused-mut.rs

   1 // extra unused mut lint tests for #51918
   2
   3 // check-pass
   4
   5 #![feature(generators)]
   6 #![deny(unused_mut)]
   7
   8 fn ref_argument(ref _y: i32) {}
   9
  10 // #51801
  11 fn mutable_upvar() {
  12     let mut x = 0;
  13     move || {
  14         x = 1;
  15     };
  16 }
  17
  18 // #50897
  19 fn generator_mutable_upvar() {
  20     let mut x = 0;
  21     move || {
  22         x = 1;
  23         yield;
  24     };
  25 }
  26
  27 // #51830
  28 fn ref_closure_argument() {
  29     let _ = Some(0).as_ref().map(|ref _a| true);
  30 }
  31
  32 struct Expr {
  33     attrs: Vec<u32>,
  34 }
  35
  36 // #51904
  37 fn parse_dot_or_call_expr_with(mut attrs: Vec<u32>) {
  38     let x = Expr { attrs: vec![] };
  39     Some(Some(x)).map(|expr|
  40         expr.map(|mut expr| {
  41             attrs.push(666);
  42             expr.attrs = attrs;
  43             expr
  44         })
  45     );
  46 }
  47
  48 // Found when trying to bootstrap rustc
  49 fn if_guard(x: Result<i32, i32>) {
  50     match x {
  51         Ok(mut r) | Err(mut r) if true => r = 1,
  52         _ => (),
  53     }
  54 }
  55
  56 // #59620
  57 fn nested_closures() {
  58     let mut i = 0;
  59     [].iter().for_each(|_: &i32| {
  60         [].iter().for_each(move |_: &i32| {
  61             i += 1;
  62         });
  63     });
  64 }
  65
  66 fn main() {}