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defmethod auto-create copies clojure.core dispatch (fix SCI regression)

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The prior fix resolved an unqualified defmethod to clojure.core's multifn, which
broke SCI (it relies on per-ns shadow multimethods — hung loading core_protocols).
Keep the shadow, but when auto-creating it copy the dispatch fn + default from a
same-named clojure.core multifn (e.g. print-method's 2-arg dispatch) instead of
the 1-arg identity that crashed (print-method x w). Also trim the FQN class
tokens to value classes only (the collection interfaces shadowed names SCI uses).

Corpus 2705/2741 0 new div; SCI 162/218 restored; cross-ns + direct print-method
overrides work.
This commit is contained in:
Yogthos 2026-06-21 20:04:13 -04:00
parent bb6c9eeb29
commit e3674d17a7
2 changed files with 17 additions and 20 deletions
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27
host/chez/multimethods.ss
View file

@ -58,22 +58,21 @@
(let* ((nm (symbol-t-name mm-sym))
(sns (symbol-t-ns mm-sym))
(qns (and sns (not (jolt-nil? sns)) (not (null? sns)) sns))
;; resolve the multifn's HOME ns like a var: a qualified name in its own ns
;; (cross-ns defmethod); an unqualified name via current ns -> :refer ->
;; clojure.core, so (defmethod print-method ...) finds clojure.core's multifn
;; instead of auto-creating a stray one in the current ns.
(mns (cond
(qns (or (chez-resolve-alias (chez-current-ns) qns) qns))
((let ((c (var-cell-lookup (chez-current-ns) nm))) (and c (var-cell-defined? c)))
(chez-current-ns))
((chez-resolve-refer (chez-current-ns) nm))
((let ((c (var-cell-lookup "clojure.core" nm))) (and c (var-cell-defined? c)))
"clojure.core")
(else (chez-current-ns))))
;; qualified (cf.mm/ext) resolves in its own ns (cross-ns defmethod);
;; unqualified stays in the current ns (a shadow, as before).
(mns (if qns (or (chez-resolve-alias (chez-current-ns) qns) qns) (chez-current-ns)))
(cur (var-deref mns nm))
(mf (if (jolt-multifn? cur) cur
(let ((m (make-jolt-multifn nm (var-deref "clojure.core" "identity")
(new-mm-table) kw-default #f (new-mm-table))))
;; auto-create: copy the dispatch fn + default from a same-named
;; clojure.core multifn (e.g. print-method's 2-arg dispatch) so a
;; (defmethod print-method ...) before naming clojure.core's still
;; dispatches right — the old 1-arg identity fallback crashed.
(let* ((core (var-deref "clojure.core" nm))
(disp (if (jolt-multifn? core)
(jolt-multifn-dispatch-fn core)
(var-deref "clojure.core" "identity")))
(deft (if (jolt-multifn? core) (jolt-multifn-default core) kw-default))
(m (make-jolt-multifn nm disp (new-mm-table) deft #f (new-mm-table))))
(def-var! mns nm m) m))))
(hashtable-set! (jolt-multifn-methods mf) dval impl)
mf))