live_ast_quick_ref.rb

# Ideal syntax for pattern matched methods:
def handle_response(body)
in 200, response
  # Ok response
in 500, error
  # Handle failure
else
  # No idea?
end

# Hack variant:
def handle_response(body)
  _in 200, response do
    # Ok response
  end
  
  _in 500, error do
  	# Handle failure
  end
  
  _else do
	# No idea?
  end
end

# With live AST can be transposed to:
def handle_response(body)
  case response
  in 200, response
    # Ok response
  in 500, error
    # Handle failure
  else
    # No idea?
  end
end