Bug #10870: Hash Literal Declined As First Argument

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: 2.0.0-p481
• Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN

[NorthernLights (Imran "")]

Hi,

When a hash literal is passed as first argument to a method, Ruby throws a syntax error.
Example code:

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.

foo 'Unnecessary 1st Argument', {:hello => 123}     # Error gone

Cheers.

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

[nobu (Nobuyoshi Nakada)]

• Description updated (diff)
• Status changed from Open to Rejected

It is parsed as a block.
You don't need braces in that case.

def foo *args
  p args
end
foo :hello => 123

Or put parentheses.

foo(:hello => 123)
foo({:hello => 123})

[NorthernLights (Imran "")]

Thanks.