Issue #11873 has been reported by tomoya ishida.

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Bug #11873: Syntax error and parse problem when calling a method without parentheses
https://bugs.ruby-lang.org/issues/11873

* Author: tomoya ishida
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin14]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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In the following case, syntax error rises when calling a method without parentheses.

~~~ruby
a b{c d}, :e do end #=> syntax error(should be syntax ok)
a b(c d), :e do end #=> syntax error(should be syntax ok)
a b{c(d)}, :e do end #=> syntax ok(expected)
a b(c(d)), :e do end #=> syntax ok(expected)
~~~


If you change the literal `:e` to a method name, then the do-block is passed to the wrong method

~~~ruby
p p{p p;p(p)}, tap do puts 'Hello' end
#=> LocalJumpError(expected. do-end is passed to the first p)
p p{p(p);p p}, tap do puts 'Hello' end
#=> shows Hello(why? do-end is passed to tap)
~~~


versions are

~~~
1.8.7-p375
1.9.3-p547
2.1.1p76
2.2.0p0
2.3.0p0
~~~



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