include bug in guile

[rain1]

I think this is a bug in guile relating to "include":

a.scm: (define a 1)
b.scm: (include "a.scm") (display a) (newline)

guile -l b.scm # prints 1

now update
a.scm: (define a 2)

guile -l b.scm # still prints 1