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error[E0716]: temporary value dropped while borrowed
  --> $DIR/borrowck-let-suggestion.rs:2:17
   |
LL |     let mut x = vec![1].iter();
   |                 ^^^^^^^       - temporary value is freed at the end of this statement
   |                 |
   |                 creates a temporary value which is freed while still in use
LL |
LL |     x.use_mut();
   |     ----------- borrow later used here
   |
   = note: consider using a `let` binding to create a longer lived value
   = note: this error originates in the macro `vec` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

For more information about this error, try `rustc --explain E0716`.