Bug #11802: Hash.new and {} have different behaviour

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
• Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN

[aufi (Marek Aufart)]

It looks that {} is not recognized as a variable sometimes.

irb(main):001:0> p Hash.new
{}
=> {}
irb(main):002:0> p {}
=> nil

Similar in rspec test:

expect(subject.something).to eq {} # fails on not given argument for eq
expect(subject.something).to eq({}) # works

[aufi (Marek Aufart)]

It looks like a block, but:

irb(main):001:0> {}.class
=> Hash
irb(main):002:0> {}
=> {}

[Hanmac (Hans Mackowiak)]

p {} is parsed as p() { }

you see it when you try:

p { :key => "value"} #which does raise a Syntax Error

you need ()

p({ :key => "value"}) # => {:key=>"value"}

[marcandre (Marc-Andre Lafortune)]

• Status changed from Open to Rejected