Issue #17124 has been reported by marcandre (Marc-Andre Lafortune).

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Bug #17124: Wrong "ambiguous first argument" warning
https://bugs.ruby-lang.org/issues/17124

* Author: marcandre (Marc-Andre Lafortune)
* Status: Open
* Priority: Normal
* Assignee: nobu (Nobuyoshi Nakada)
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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```sh
$ ruby -v -e "x='a'; x.match? /[a-z]/"
ruby 2.8.0dev (2020-07-30T14:07:06Z master 352895b751) [x86_64-darwin18]
-e:1: warning: ambiguous first argument; put parentheses or a space even after `/' operator
```

There is no `/' operator in there and there is also no ambiguity as adding a space after the first `/` is a syntax error.

Is it possible to remove the warning altogether when the argument is lexed as a regexp?

The message could use a rewording too, maybe "ambiguous first argument; put parentheses around argument or add a space after `/' operator"



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