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I have been struggling with the "multiload" exercise in chapter 16
of Programming in Lua. I managed to cook up a "loadwithprefix"
that worked satisfactorily but when I extended it in the obvious
way with a postfix as well I got "file already closed" errors.
The io.lines iterator must have changed for Lua 5.4 to keep
track of when the file is to-be-closed, and so presumably an
extra upvalue of the iterator function is being used for this.
But I am getting a headache trying to work out from liolib.c
exactly what is going on. Can any kind expert give me some hints?
Gavin Wraith (
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