Parse comma-separated branches in macro definitions #4173
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A "macro" definition like
```rust
macro m {
() => {},
($a:expr) => {$a},
}
```
has its branches separated by commas. Previously rustfmt only parsed
branches separated by semicolons, which is applicable only to
"macro_rules" definitions.
Closes rust-lang#4111
bradleypmartin
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May 25, 2020
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A "macro" definition like
has its branches separated by commas. Previously rustfmt only parsed
branches separated by semicolons, which is applicable only to
"macro_rules" definitions.
Closes #4111