[ruby-core:108148] [Ruby master Bug#18673] Anonymous block forwarding fails when combined with keyword arguments

Issue #18673 has been reported by brasic (Carl Brasic).

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Bug #18673: Anonymous block forwarding fails when combined with keyword arguments
https://bugs.ruby-lang.org/issues/18673

* Author: brasic (Carl Brasic)
* Status: Open
* Priority: Normal
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
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Hello!

I tried to use the anonymous block forwarding feature introduced in https://bugs.ruby-lang.org/issues/11256 and released with ruby 3.1.

Unfortunately it appears to unexpectedly fail during parsing when used in a method that also accepts keyword arguments.  I don't see this limitation documented so I presume it is a bug.  I've attached a simple reproduction script.

/cc @jeremyevans0 as author.

```
$ ruby -v
ruby 3.1.1p18 (2022-02-18 revision 53f5fc4236) [x86_64-linux]
$ ruby anon_repro.rb
anon_repro.rb:14: no anonymous block parameter
```


Carl

---Files--------------------------------
anon_repro.rb (223 Bytes)


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