[ruby-core:76961] [Ruby trunk Feature#12686] Allowing a postposed rescue in a method argument

Issue #12686 has been updated by Nobuyoshi Nakada.


`tLPAREN_ARG` has been introduced at 1.7, I think we can clear up spaces and parentheses rules now.

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Feature #12686: Allowing a postposed rescue in a method argument
https://bugs.ruby-lang.org/issues/12686#change-60189

* Author: Naotoshi Seo
* Status: Open
* Priority: Normal
* Assignee: 
----------------------------------------
On defining my own DSL, I wanted to write a code like:

```
foo (Integer(ENV['FOO']) rescue nil)
```

where `foo` is a method which receives one argument , but I got following error

```
SyntaxError: (irb):1: syntax error, unexpected modifier_rescue, expecting ')'
```

In contrast, following codes were valid:

```
foo ((Integer(ENV['FOO']) rescue nil))
```

or

```
foo (begin; Integer(ENV['FOO']); rescue; nil; end)
```

This is a feature request to allow such a syntax, a postposed rescue in a method argument.



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