Return error strings with "trivial" closure. #2
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Basically, this just returns an error string as a second return value, if a problem occurred loading the mo file.
This follows the Lua idiom established by e.g. io.open().
The client can now handle error conditions, if they care, rather than living with a mysterious, silent failure.
I also beefed up the first check for a valid path;
type(mo_file) ~= "string")will catch nil as well as other types.I checked that this file compiles and handles path errors reasonably.
I don't know the .mo format well enough to exercise the other error clauses, but they're pretty straightforward.