Get Global values in Oct file

[babelproofreader]

How to access global values in an oct file? When I try using
get_global_value() I get the warning

warning: ‘octave_value get_global_value(const string&, bool)’ is deprecated:
[4.4]: use 'symbol_table::global_varval' instead [-Wdeprecated-declarations]

What is the new way of using 'symbol_table::global_varval'? I cannot find
any documentation for this. I'm using Octave 5.1.0 on a Linux system. 



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