@@ 250,11 250,23 @@ to happen in that order."
lst)))
(return (reverse result))))
-(define-inlinable (sequence monad lst)
+(define-syntax-rule (sequence monad lst)
"Turn the list of monadic values LST into a monadic list of values, by
evaluating each item of LST in sequence."
+ ;; XXX: Making it a macro is a bit brutal as it leads to a lot of code
+ ;; duplication. However, it allows >>= and return to be open-coded, which
+ ;; avoids struct-ref's to MONAD and a few closure allocations when using
+ ;; %STATE-MONAD.
(with-monad monad
- (mapm monad return lst)))
+ (let seq ((lstx lst)
+ (result '()))
+ (match lstx
+ (()
+ (return (reverse result)))
+ ((head . tail)
+ (>>= head
+ (lambda (item)
+ (seq tail (cons item result)))))))))
(define (anym monad proc lst)
"Apply PROC to the list of monadic values LST; return the first value,