Auto merge of #45069 - sinkuu:tuple_arg, r=nikomatsakis

Better error for missing tuple pattern in args

#44150

Before:
```
error[E0593]: closure takes 2 arguments but 1 argument is required
 --> test.rs:5:40
  |
5 |     let it = v.into_iter().enumerate().map(|i, x| i);
  |                                        ^^^ -------- takes 2 arguments
  |                                        |
  |                                        expected closure that takes 1 argument
```

After:
```
error[E0593]: closure takes 2 arguments but a 2-tuple is required
 --> test.rs:5:40
  |
5 |     let it = v.into_iter().enumerate().map(|i, x| i);
  |                                        ^^^ ------ takes 2 arguments
  |                                        |
  |                                        expected closure that takes a 2-tuple
```

0 files changed, 0 insertions, 0 deletions