From: jacknagel@...
Date: 2015-02-19T23:57:00+00:00
Subject: [ruby-core:68194] [Ruby trunk - Bug #10870] Hash Literal Declined	As First Argument

Issue #10870 has been updated by Jack Nagel.


`foo {}` without parentheses is equivalent to `foo() {}`, (i.e. passing a block to `foo`) not `foo({})`.

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Bug #10870: Hash Literal Declined As First Argument
https://bugs.ruby-lang.org/issues/10870#change-51564

* Author: Imran ""
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 2.0.0-p481
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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Hi,

When a hash literal is passed as first argument to a method, Ruby throws a syntax error.
Example code:
~~~ruby
def foo *args
  p args
end

foo 'Hello'
foo 123
foo ['Hello', 123]
foo {:hello => 123}   # Syntax Error: Unexpected =>  Expecting }
~~~
However, shifting hash literal over to second place, somehow makes it all legal.
~~~ruby
foo 'Unnecessary 1st Argument', {:hello => 123}     # Error gone
~~~

Cheers.



-- 
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