Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2020355 
(FPCore (a k m)
  :name "Falkner and Boettcher, Appendix A"
  :precision binary64
  (/ (* a (pow k m)) (+ (+ 1.0 (* 10.0 k)) (* k k))))

Backtrace

application: not a procedure; expected a procedure that can be applied to arguments given: #f arguments...: [none]		L	C
loop	/data/pavpan/nightlies/herbie/taylor-one-var/src/mainloop.rkt	174	10
for-loop	/data/pavpan/nightlies/herbie/taylor-one-var/src/mainloop.rkt	169	8
for-loop	/data/pavpan/nightlies/herbie/taylor-one-var/src/mainloop.rkt	169	8
taylor-alt	/data/pavpan/nightlies/herbie/taylor-one-var/src/mainloop.rkt	161	0
gen-series!	/data/pavpan/nightlies/herbie/taylor-one-var/src/mainloop.rkt	185	0
run-iter!	/data/pavpan/nightlies/herbie/taylor-one-var/src/mainloop.rkt	380	0
run-improve	/data/pavpan/nightlies/herbie/taylor-one-var/src/mainloop.rkt	397	0
(unnamed)	/data/pavpan/nightlies/herbie/taylor-one-var/src/sandbox.rkt	54	6
run	/opt/racket-7.9/share/pkgs/profile-lib/main.rkt	39	2
profile-thunk	/opt/racket-7.9/share/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/opt/racket-7.9/collects/racket/engine.rkt	42	24

Reproduce

herbie shell --seed 2020355 
(FPCore (a k m)
  :name "Falkner and Boettcher, Appendix A"
  :precision binary64
  (/ (* a (pow k m)) (+ (+ 1.0 (* 10.0 k)) (* k k))))