Why Ruby failed to parse a Hash literal with multiple here documents.

ruby_hash_literal_with_here_document.md

1 element

h = { 
  hoge: <<EOS
Hey!
EOS
}

p h

print:

% ruby a.rb
{:hoge=>"Hey!\n"}

multiple elements

h = {
  hoge: <<EOS
Hey!
EOS
  ,
  fuga: <<EOS
Yo!
EOS
}

p h

print:

% ruby a.rb
a.rb:5: syntax error, unexpected ',', expecting '}'
a.rb:9: syntax error, unexpected '}', expecting $end

Why?

Resolved!

Thanks to @hideo55 ! See: https://gist.github.com/3128882