===============================================================================
No parameters
===============================================================================

func one() int {}

-------------------------------------------------------------------------------

(source_file
	(function_definition
		name: (identifier)
		parameters: (parameters)
		return_type: (primitive_type)
		body: (block)))

===============================================================================
1 parameter
===============================================================================

func one(x int) int {}

-------------------------------------------------------------------------------

(source_file
	(function_definition
		name: (identifier)
		parameters: (parameters
			(parameter
				(identifier)
				(primitive_type)))
		return_type: (primitive_type)
		body: (block)))

===============================================================================
1 parameter with trailing comma
===============================================================================

func one(
	x int,
) int {}

-------------------------------------------------------------------------------

(source_file
	(function_definition
		name: (identifier)
		parameters: (parameters
			(parameter
				(identifier)
				(primitive_type)))
		return_type: (primitive_type)
		body: (block)))

===============================================================================
2 parameters
===============================================================================

func one(x int, y int) int {}

-------------------------------------------------------------------------------

(source_file
	(function_definition
		name: (identifier)
		parameters: (parameters
			(parameter
				(identifier)
				(primitive_type))
			(parameter
				(identifier)
				(primitive_type)))
		return_type: (primitive_type)
		body: (block)))

===============================================================================
2 parameters with trailing comma
===============================================================================

func one(
	x int,
	y int,
) int {}

-------------------------------------------------------------------------------

(source_file
	(function_definition
		name: (identifier)
		parameters: (parameters
			(parameter
				(identifier)
				(primitive_type))
			(parameter
				(identifier)
				(primitive_type)))
		return_type: (primitive_type)
		body: (block)))

===============================================================================
[Error] No space between parameter name and type
===============================================================================

func one(xint) int {}

-------------------------------------------------------------------------------

(source_file
	(function_definition
		name: (identifier)
		parameters: (parameters
			(ERROR
				(identifier)))
		return_type: (primitive_type)
		body: (block)))