Having trouble with syntax-source

[Mitchell Kember]

Hi,

I'm having trouble using syntax-source in a macro.

Here's what I have:

    #!r6rs
    (import (rnrs (6)))
    (define-syntax foo
      (lambda (x)
        (syntax-case x ()
          ((_ e)
           (begin
             (display (syntax-source #'e))
             (newline)
             #'(display (syntax-source #'e)))))))
    (foo (list 1))

Displaying the syntax-source works the first time during macro
expansion, but not the second time in the result of the macro:

    $ guile --no-auto-compile --r6rs test-0-guile.ss
    ((filename . test-0-guile.ss) (line . 13) (column . 5))
    Backtrace:
    2 (primitive-load "/path/to/test-0-guile.ss")
    In ice-9/eval.scm:
    191:35 1 (_ #f)
    In unknown file:
    0 (syntax-source (#<syntax list> #<syntax 1>))

    ERROR: In procedure syntax-source:
    In procedure syntax-source: Wrong type argument in position 1
(expecting syntax object): (#<syntax list> #<syntax 1>)

I've tried the same thing in Racket and Chez Scheme and it works fine there:

https://gist.github.com/mk12/dc5a54107e46e67d702bb377304b144f

Is there some way to fix it for Guile? (Ideally in a way that also
works for Racket and Chez, since I'm in a codebase that targets all of
them, https://github.com/mk12/sicp).

Thanks,
Mitchell