io.loaddata() or buffer.assigns()

io.loaddata() or buffer.assigns()

[Thierry Horsin via ntg-context]

Hi everybody
Are there any type of files that is required by io.loaddata or/and buffers.assign ?

The following code works pretty well if there is no compilation problem by g++.
But it fails, i.e. \typebuffer[Mybuffer], does not produce anything if g++ fails (due to some errors in the cpp)
I have checked that err.cpp is well and truly created when g++ fails. 
\startluacode
	io.savedata("complx.h",buffers.getcontent("MyBuffer1"))
	io.savedata("complx.cpp",buffers.getcontent("MyBuffer2"))
	io.savedata("testcomplx.cpp",buffers.getcontent("MyBuffer3"))
	local l=os.execute("g++ -O3 -Wall -o testcomplx testcomplx.cpp complx.cpp 2> err.cpp")
	if l==0 then
		os.execute("./testcomplx > testcomplx.tmp")
		buffers.assign("MyBuffer",io.loaddata("testcomplx.tmp"))
       	else
		buffers.assign("Mybuffer",io.open("err.cpp","r"))
	
	end
\stopluacode

Many thanks
Thierry
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