From: jdamon@...
Date: 2016-09-13T17:11:23+00:00
Subject: [ruby-core:77263] [Ruby trunk Bug#12758] Error when passing Hash construction to function

Issue #12758 has been reported by Jimi Damon.

----------------------------------------
Bug #12758: Error when passing Hash construction to function
https://bugs.ruby-lang.org/issues/12758

* Author: Jimi Damon
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.1.3p242 (2014-09-19 revision 47630) [x86_64-linux]
* Backport: 2.3: UNKNOWN
----------------------------------------
I apologize if this is a known issue but I couldn't find it in the search.


If you have a function that can take a Hash, it behaves correctly if you pass a variable that contains the Hash compared to when you pass in a Hash construction using braces {}. 

Example

def foo(a)
  puts a.class
  puts a
end

> foo [1,2]
Array
[1, 2]
> a = { a:1 }
> foo a 
Hash
{:a=>1}

# This breaks
> foo { a:1 }

SyntaxError: (irb):23: syntax error, unexpected ':', expecting '}'
foo {a:1}
       ^

but this works

> foo( {a:1} )
Hash
{:a=>1}


This is more of a bug related to consistent syntax of the language and it is something that is allowed in Groovy and Scala










-- 
https://bugs.ruby-lang.org/

Unsubscribe: <mailto:ruby-core-request@ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>