How should I interpret come evening in this long sentence?
This ensures that, come evening, you've remembered whether or not you followed through in the morning.
This is a new grammar that I haven't seen before. What grammar does it follow?
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Come spring the trees will be green and the flowers blossom.
In my view the basic sentence of "come spring" is "When spring has come" or in older language "When spring is come". (In German it is still: Der Frühling ist gekommen.)
"When spring has/is come" was shortened to "spring come" and "come" was placed before "spring".
So, in my view, "come" is a past participle.