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##### start of app.pl ##### 
#!/usr/bin/perl
...
# ERROR IS IN THE NEXT LINE: %settings is empty (because %default_sett
+ings is empty)
my %settings = %default_settings;
##### end of app.pl #####

##### start of settings.pl ##### 
%default_settings = (
...
    $game => "etqw"
);
##### end of settings.pl #####

##### start example #####
spirit@threat:~/develop/example$ cat hello.cpp
...
Hello world!
I'm 3 years old!
##### end example #####