I've just added a minor new feature to Holbert. You can now load a file from a URL automatically by specifying it as the URL query string. E.g. 's gist on MLTT in Holbert can be loaded automatically and shared with a single link:
liamoc.net/holbert/?https
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Oooh neat. I wonder if there is a way to get the latest version somehow… not sure if Gist's have a special URL for that… 🤔
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You can now see how I got stuck on a proof at the bottom 😅
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The assumption in the theorem statement is Thing : Type 0, not _:_ Thing (Type 0)
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With that fix, I got the proof done.
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(BTW, I plan to add mix-fix syntax declarations -- in fact, they're basically already implemented.)
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Another confusing thing I plan to fix is that when a rule that introduces new variables is used multiple times it will use the same name each time. I will make Holbert try to disambiguate them a bit.
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Ahh yeah - I try to rename them when it makes sense to do so, but it would be helpful to do something like that automatically.
Oh woops, fixed :)