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-rw-r--r--module/language/tree-il/peval.scm21
1 files changed, 12 insertions, 9 deletions
diff --git a/module/language/tree-il/peval.scm b/module/language/tree-il/peval.scm
index c39069f69..937a797f0 100644
--- a/module/language/tree-il/peval.scm
+++ b/module/language/tree-il/peval.scm
@@ -1306,12 +1306,16 @@ top-level bindings from ENV and return the resulting expression."
'()))))))))
(($ <primcall> src 'values exps)
- (cond
- ((null? exps)
- (if (eq? ctx 'effect)
- (make-void #f)
- exp))
- (else
+ (match exps
+ (()
+ (case ctx
+ ((effect) (make-void #f))
+ ((values) exp)
+ ;; Zero values returned to continuation expecting a value:
+ ;; ensure that we raise an error.
+ (else (make-primcall src 'values (list exp)))))
+ ((($ <primcall> _ 'values ())) exp)
+ (_
(let ((vals (map for-value exps)))
(if (and (case ctx
((value test effect) #t)
@@ -1357,12 +1361,11 @@ top-level bindings from ENV and return the resulting expression."
('make-prompt-tag ($ <const> _ (? string?))))
#t)
(_ #f)))
- ;; Some expressions can be folded without visiting the
- ;; arguments for value.
(let ((res (if (eq? ctx 'effect)
(make-void #f)
(make-const #f #t))))
- (for-tail (list->seq src (append args (list res))))))
+ (for-tail (list->seq src (append (map for-value args)
+ (list res))))))
(else
(match (cons name (map for-value args))
(('cons x ($ <const> _ (? (cut eq? <> '()))))