[ruby-core:119304] [Ruby master Bug#20761] [DOC] `RubyVM::AbstractSyntaxTree.of` examples raise because parser is prism by default

Issue #20761 has been updated by kddnewton (Kevin Newton).


For a proc you can mirror what `RubyVM::AbstractSyntaxTree.of` is doing under the hood using `RubyVM::InstructionSequence`, as in:

```ruby
my_proc = -> { 1 }

iseq = RubyVM::InstructionSequence.of(my_proc)
node_id = iseq.to_a[4][:node_id]
source = iseq.script_lines.join

require "prism"
Prism.parse(source).value.breadth_first_search { |node| node.node_id == node_id }
```

----------------------------------------
Bug #20761: [DOC] `RubyVM::AbstractSyntaxTree.of` examples raise because parser is prism by default
https://bugs.ruby-lang.org/issues/20761#change-109915

* Author: Earlopain (A S)
* Status: Closed
* ruby -v: 3.4-dev
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
https://docs.ruby-lang.org/en/master/RubyVM/AbstractSyntaxTree.html#method-c-of

```rb
RubyVM::AbstractSyntaxTree.of(proc {1 + 2})
# => <internal:ast>:97:in 'RubyVM::AbstractSyntaxTree.of': cannot get AST for ISEQ compiled by prism (RuntimeError)
```

Same for the method example. Is this method even functional when prism is used, or is the prism gem able to do this somehow?



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