[ruby-core:93834] [Ruby master Bug#10463] :~@ and :!@ are not parsed correctly

Issue #10463 has been updated by jeremyevans0 (Jeremy Evans).

File tilde-bang-at-symbols.patch added

matz confirmed in the last developer meeting that he wants `def !@; end` to continue to work.  However, I still think we should fix it so that `:!@` and `:~@` are not treated as `:!` and `:~`.  This is a bit tricky to do as the parser currently uses the same lex state for both cases (`EXPR_FNAME`).

The simplest way I can think to fix this is in the attached patch. It changes the `:!` and `:~` cases to use lex state `EXPR_FNAME|EXPR_FITEM`, and changes the code to check on whether `EXPR_FITEM` is one of the lex states.  If `EXPR_FITEM` is one of the lex states, then it doesn't ignore the `@`.

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Bug #10463: :~@ and :!@ are not parsed correctly
https://bugs.ruby-lang.org/issues/10463#change-79706

* 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
:~@  # => :~
:!@  # => :!
~~~

---Files--------------------------------
tilde-bang-at-symbols.patch (2.22 KB)


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