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haskell: Phase 14 — record patterns Foo { f = b } in case + fun-clauses
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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
giles
2026-05-07 17:18:08 +00:00
parent 76d141737a
commit a4fd57cff1
3 changed files with 88 additions and 14 deletions
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25
lib/haskell/desugar.sx
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@@ -142,6 +142,27 @@
(list
:app (hk-desugar (nth node 1))
(hk-desugar (nth node 2))))
((= tag "p-rec")
(let
((cname (nth node 1))
(field-pats (nth node 2))
(field-order (hk-record-field-names cname)))
(cond
((nil? field-order)
(raise (str "p-rec: no record info for " cname)))
(:else
(list
:p-con
cname
(map
(fn
(fname)
(let
((p (hk-find-rec-pair field-pats fname)))
(cond
((nil? p) (list :p-wild))
(:else (hk-desugar (nth p 1))))))
field-order))))))
((= tag "rec-update")
(list
:rec-update
@@ -217,7 +238,7 @@
:case (hk-desugar (nth node 1))
(map hk-desugar (nth node 2))))
((= tag "alt")
(list :alt (nth node 1) (hk-desugar (nth node 2))))
(list :alt (hk-desugar (nth node 1)) (hk-desugar (nth node 2))))
((= tag "do") (hk-desugar-do (nth node 1)))
((= tag "sect-left")
(list :sect-left (nth node 1) (hk-desugar (nth node 2))))
@@ -234,7 +255,7 @@
((= tag "fun-clause")
(list
:fun-clause (nth node 1)
(nth node 2)
(map hk-desugar (nth node 2))
(hk-desugar (nth node 3))))
((= tag "instance-decl")
(list