A confusing behaviour involving passing a tuple to a constructor without parentheses.

tuple_issue.cr

# Simple working example shown below

foo = Foo.new({2, 2})
#             ^     ^ Outer parentheses present
class Foo
  def initialize(bar : {Int32, Int32})
    # Code
  end
end

# This, however, will not compile:

foo = Foo.new {2, 2}
#             ^     ^ Outer parentheses removed

class Foo
  def initialize(bar : {Int32, Int32})
    # Code
  end
end

# When run, this results in 
# unexpected token: ,
# foo = Foo.new { 2, 2 }
#                  ^