/usr/lib/swipl/library/dcg/basics.pl
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 eos//
Matches end-of-input. The implementation behaves as the following portable implementation: 
eos --> call(eos_).
eos_([], []).
To be done
- This is a difficult concept and violates the context free property of DCGs. Explain the exact problems.
ClioPatria (version V3.1.1-40-g9d9e003)