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Process type abbreviations in function headers.
Still a couple of places where doing this causes strange errors. We'll
track those down next.
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The old approach with '&' and '@' modifiers turned out to be a bad idea
because it introduces notions of precedence. Worse, it turns out you
want different precedence rules at different times as the old test
alluded:
x:@number:3 # we want this to mean (address number 3)
x:address:@number # we want this to mean (address array number)
Instead we'll give up and focus on a single extensible mechanism that
allows us to say this instead:
x:@:number:3
x:address:@:number
In addition it allows us to shorten other types as well:
x:&:@:num
type board = &:@:&:@:char # for tic-tac-toe
Hmm, that last example reminds me that we don't handle abbreviations
inside type abbreviation definitions so far..
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Always show instruction before any transforms in error messages.
This is likely going to make some errors unclear because they *need* to
show the original instruction. But if we don't have tests for those
situations did they ever really work?
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Standardize quotes around reagents in error messages.
I'm still sure there's issues. For example, the messages when
type-checking 'copy'. I'm not putting quotes around them because in
layer 60 I end up creating dilated reagents, and then it's a bit much to
have quotes and (two kinds of) brackets. But I'm sure I'm doing that
somewhere..
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