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Idiom # 95: Get file size

See programming-idioms.org:


The variable x in this case will be of type outcome i64, i.e., it will be either the file size or an instance of error in case the file size could not be determined. A match expression is needed to extract the size.

Alternatively, the following code forcefully extracts the size from the result, but will crash in case of an error:

Running Example