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It then becomes possible to combine the return type info with the input type info to limit the number of cases to handle"
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should not be too hard to make it work for graphs"
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label="1. record the fields added via node-with+, node-with! and node-with!!
2. The types which may have been added are therefore:
(difference input-types output-types) ∩ fields-mentionned-in-with*"
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This issue also occurs with node creation functions too (but they are functions, so they can at least be passed around)"
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and use (g-row-inst f g-row-var).
I doubt we could find a way to infer the graph row variable to pass in a feasible way.
We could override #%app to allow a more concise syntax, but that's it."
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We know what the original may be statically (one of the graph's nodes)."
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(U (tagged tag all-fields …)
(tagged WITH extra-fields … (tagged tag original-fields))
Problem with that: it won't work with functional updates (i.e. it'll work only with+, not with!! nor with!)
because the with!! won't know what is the type of the tagged structure."
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This poly type encapsulates the "extra" fields.
The return type of the mapping should indicate that the node has a "row" and which tvar to use
Statically, we can recognize that from the input, and perform the merge in an easy way"
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auto-create the node, filling each field via (get-field f result) || (get-field f (next result)) || …
and with! etc. only return a sort of pair with the new or overwritten fields in a tagged structure at the front, and the original in the rest"
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label="but we must ensure that the return type is correct. How could we do that???"
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label="Bind the result with let, letting it infer the type,
grab the fields with get-field/fallback
and only enforce the type on the result / on the individual fields"
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label="Not so much of a problem,
because we don't use subtyping, we use *bounded* row polymorphism
so we always know the exact list of types allwed,
and don't really use the subtyping aside from (U alt₁ … altₙ)"
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The node name should be concise enough that it's not too much of a pain to write it in a lot of places."
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