Rollup merge of #114178 - estebank:let-binding-macro, r=petrochenkov

Account for macros when suggesting a new let binding

Provide a structured suggestion when the expression comes from a macro expansion:

```
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: this error originates in the macro `vec` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider using a `let` binding to create a longer lived value
   |
LL ~     let binding = vec![1];
LL ~     let mut x = binding.iter();
   |
```

0 files changed, 0 insertions, 0 deletions