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Rollup merge of #139132 - m-ou-se:hir-pp-struct-expr, r=compiler-errors
Improve hir_pretty for struct expressions.
While working on https://github.com/rust-lang/rust/pull/139131 I noticed the hir pretty printer outputs an empty line between each field, and is also missing a space before the `{` and the `}`:
```rust
let a =
StructWithSomeFields{
field_1: 1,
field_2: 2,
field_3: 3,
field_4: 4,
field_5: 5,
field_6: 6,};
let a = StructWithSomeFields{ field_1: 1, field_2: 2, ..a};
```
This changes it to:
```rust
let a =
StructWithSomeFields {
field_1: 1,
field_2: 2,
field_3: 3,
field_4: 4,
field_5: 5,
field_6: 6 };
let a = StructWithSomeFields { field_1: 1, field_2: 2, ..a };
```
