[boost] [spirit]why x3::alternative::parse not short-circuited?

Subject: [boost] [spirit]why x3::alternative::parse not short-circuited?
From: Larry Evans (cppljevans_at_[hidden])
Date: 2018-01-27 18:44:51

https://github.com/boostorg/spirit/blob/develop/include/boost/spirit/home/x3/operator/alternative.hpp#L29

shows both left.parse *and* right.parse are called.
Shouldn't right.parse be skipped if left.parse succeeds?