From: "ufuk (Ufuk Kayserilioglu) via ruby-core" <ruby-core@...>
Date: 2026-04-06T16:47:48+00:00
Subject: [ruby-core:125204] [Ruby Bug#21983] RubyVM::AST no way to find &nil

Issue #21983 has been updated by ufuk (Ufuk Kayserilioglu).


I am guessing that the `&nil` case should read `block: false` by comparing it to the `**nil` case:
```shell
��� ruby -e 'pp RubyVM::AbstractSyntaxTree.parse("def foo(**nil); end")'
(SCOPE@1:0-1:19
 tbl: []
 args: nil
 body:
   (DEFN@1:0-1:19
    mid: :foo
    body:
      (SCOPE@1:0-1:19
       tbl: []
       args:
         (ARGS@1:8-1:13
          pre_num: 0
          pre_init: nil
          opt: nil
          first_post: nil
          post_num: 0
          post_init: nil
          rest: nil
          kw: false
          kwrest: false
          block: nil)
       body: nil)))
```

----------------------------------------
Bug #21983: RubyVM::AST no way to find &nil
https://bugs.ruby-lang.org/issues/21983#change-116937

* Author: kddnewton (Kevin Newton)
* Status: Open
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN
----------------------------------------
```
$ ./ruby -e 'pp RubyVM::AbstractSyntaxTree.parse("def foo(&nil); end")'
(SCOPE@1:0-1:18
 tbl: []
 args: nil
 body: (DEFN@1:0-1:18 mid: :foo body: (SCOPE@1:0-1:18 tbl: [] args: (ARGS@1:8-1:12 pre_num: 0 pre_init: nil opt: nil first_post: nil post_num: 0 post_init: nil rest: nil kw: nil kwrest: nil block: nil) body: nil)))
$ ./ruby -e 'pp RubyVM::AbstractSyntaxTree.parse("def foo(); end")' 
(SCOPE@1:0-1:14
 tbl: []
 args: nil
 body: (DEFN@1:0-1:14 mid: :foo body: (SCOPE@1:0-1:14 tbl: [] args: (ARGS@1:8-1:8 pre_num: 0 pre_init: nil opt: nil first_post: nil post_num: 0 post_init: nil rest: nil kw: nil kwrest: nil block: nil) body: nil)))
$
```

The bodies are exactly the same here.



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