on chicken 5.1.0, I get:

*** running with input (#\( #\+ #\) #\5)
JUST READ #\(
JUST READ #\+
JUST READ #\)
*** running with input (#\( #\+ #\) #\5)
JUST READ #\(
JUST READ #\+
JUST READ #\)
JUST READ #\5
EVAL ON (+)
0
EVAL ON 5
5