`Proc` made by `Hash#to_proc` should be a lambda [Bug #12671]
`Proc` made by `Hash#to_proc` should be a lambda [Bug #12671]

Like `Symbol#to_proc` (f0b815dc670b61eba1daaa67a8613ac431d32b16)

ruby/spec,nobu/rubyspec,ruby/spec,eregon/rubyspec,eregon/rubyspec,ruby/spec,nobu/rubyspec,eregon/rubyspec,nobu/rubyspec