Tests/RunCMake/Syntax/FunctionBracket1.cmake - third_party/github.com/Kitware/CMake - Git at Google

 function(fun x)
   message([[${x},${ARGN},${ARGC},${ARGV},${ARGV0},${ARGV1},${ARGV2}:]]
            "${x},${ARGN},${ARGC},${ARGV},${ARGV0},${ARGV1},${ARGV2}")
 endfunction(fun)
 fun(a n)
 fun(b n)
	function(fun x)
	message([[${x},${ARGN},${ARGC},${ARGV},${ARGV0},${ARGV1},${ARGV2}:]]
	"${x},${ARGN},${ARGC},${ARGV},${ARGV0},${ARGV1},${ARGV2}")
	endfunction(fun)
	fun(a n)
	fun(b n)