Channel program execution failed:
C stack overflow
stack traceback:
	[C]: in function 'gsub'
	[string "channel program"]:17: in function <[string "channel program"]:16>
	[C]: in function 'gsub'
	[string "channel program"]:17: in function <[string "channel program"]:16>
	[C]: in function 'gsub'
	[string "channel program"]:17: in function <[string "channel program"]:16>
	[C]: in function 'gsub'
	[string "channel program"]:17: in function <[string "channel program"]:16>
	[C]: in function 'gsub'
	[string "channel program"]:17: in function <[string "channel program"]:16>
	[C]: in function 'gsub'
	[string "channel program"]:17: in function <[string "channel program"]:16>
	[C]: in function 'gsub'
	[string "channel program"]:17: in function <[string "channel program"]:16>
	(...tail calls...)