giles
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Real OCaml accepts `match e1, e2 with | p1, p2 -> …` without
surrounding parens. parse-pattern previously stopped at the cons
layer (`p :: rest`) and treated a trailing `,` as a separator
the outer caller couldn't handle, surfacing as
"expected op -> got op ,".
Fix: `parse-pattern` now collects comma-separated patterns into a
:ptuple after parse-pattern-cons, before the optional `as` alias.
The scrutinee side already built tuples via parse-tuple, so both
sides are now symmetric.
lru_cache.ml (iter 258) reverts its workaround back to the natural
form:
let rec take n lst = match n, lst with
| 0, _ -> []
| _, [] -> []
| _, h :: r -> h :: take (n - 1) r
607/607 regressions clean.