for crystal

for.cr

macro for(expr)
  {{raise "invalid syntax. use for e in c." unless expr.args.first.name.stringify == "in"}}
  {{expr.args.first.args.first}}.each do |{{expr.name.id}}|
    {{expr.args.first.block.body}}
  end
end

for e in 1..5 do
  puts e
end

for e in [1,2,3,4] do
  puts e
end