shithub: pprolog

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ref: 8fdf0bc6e9770e2cea4d8e18299ff5a8a9aa0802
parent: 02145f06ac007d730bc16930185fe18fa3e76c68
author: Peter Mikkelsen <peter@pmikkelsen.com>
date: Tue Jun 29 12:28:09 EDT 2021

Fix some parser errors, and accept clauses without a body