[luatex] writing and reading a file

[Dirk Laurie]

2014-02-02 Herbert Voss <Herbert.Voss at fu-berlin.de>:
> Am 02.02.2014 20:38, schrieb Philipp Gesang:
>>>    out.close()
>>     out:close()
...
> Oh no, what a shame!!! I was puzzeled 20 minutes with this problem,
> looked 10 times over the code and didn't realize the dot ...

This is one of the most common mistakes I make too.

There are two palliatives (I can't call them cures).

First:
Make it a habit to put whitespace after every `:`.  It is a good habit anyway,
and the error is more visible.

Second:
~~~
require "paranoid"
~~~
where `paranoid.lua` is the attached file.
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