Lhs indexing #609
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Lhs indexing #609
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added 3 commits
June 18, 2019 15:39
generate : {n, ix, a}
(fin ix, n >= 1, ix >= width (n - 1)) => ([ix] -> a) -> [n]a
generate f = [ f i | i <- [0 .. n-1] ]
The declaration `xs @ i = e` is syntactic sugar for `xs = generate (\i -> e)`.
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Note that this patch does not yet implement lhs indexing for record constructors or field updates. So things like |
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It may be nice to to do, if you have the time, just for consistency. You'd have to modify the production for |
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Could you also update |
For example, we can now write
foo = { f : [8] -> [4][4][8] }
foo = { f i @ j @ k = i + j + k }
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829c9b9 adds support for lhs indexing on record constructors and updates. I still need to update the documentation. |
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This branch implements the feature requested in #577. It lets us write declarations of the form
xs @ i = e, which get desugared asxs = generate (\i -> e).Before merging, we still need to deal with a problem I introduced in the parser: The changes have introduced a new shift/reduce conflict that I don't yet know how to avoid. We should fix this.