Issue #10463 has been updated by nobu (Nobuyoshi Nakada).


If `:!@` and `:!`  are different things, also `!foo` and `foo.!` are different things.
This means a backward incompatibility.

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Bug #10463: :~@ and :!@ are not parsed correctly
https://bugs.ruby-lang.org/issues/10463#change-79248

* Author: sawa (Tsuyoshi Sawada)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.1.4
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
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The at mark in literal symbols `:~@` and `:!@` are ignored.

~~~ruby
:~@  # => :~
:!@  # => :!
~~~



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