[ruby-core:103797] [Ruby master Bug#17858] Trailing comma after a `&block` parameter cause a syntax error

Issue #17858 has been reported by byroot (Jean Boussier).

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Bug #17858: Trailing comma after a `&block` parameter cause a syntax error
https://bugs.ruby-lang.org/issues/17858

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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Something I just noticed:

```ruby
some_long_method(
  1,
  &block, # syntax error, unexpected ',', expecting ')'
)
```

Which seems inconsistent to me as it works for regular parameters:

```ruby
some_long_method(
  1,
  2,
)
```

I'm not sure if this is an intended limitation or just an oversight.



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