Interpreter: argument lists shared across function calls

The interpreter does not always pass fresh rest argument lists, leading
to unexpected behavior:

--8<---------------cut here---------------start------------->8---
1:=> (module foo (library srfi1))
#unspecified
1:=> (define (foo . args) (apply circular-list args) args)
foo
1:=> (foo 1 2 3)
(1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 ...
--8<---------------cut here---------------end--------------->8---

‘circular-list’ should be working on a fresh list, so that ‘foo’ would
return (1 2 3) (info "(r5rs) Procedures").

Thanks,
Ludo’.