Guile 的 make-c-struct of (system foreign) 无法解释的行为

Unexplained behaviour of Guile's make-c-struct of (system foreign)

Guile 接受以下代码:

(use-modules (system foreign))
(define ptr (make-c-struct (list int int) '(300 43)))

然而,当第二行被替换为:

时它会抛出错误
(define ptr (make-c-struct '(int int) '(300 43)))

有人能推断出问题出在哪里吗?

$ guile --version
guile (GNU Guile) 2.0.13

$ uname -a 
Linux <host> 4.8.0-1-amd64 #1 SMP Debian 4.8.5-1 (2016-10-28) x86_64 GNU/Linux

Backtrace:
In ice-9/boot-9.scm:
 160: 8 [catch #t #<catch-closure 55b8628b8600> ...]
In unknown file:
   ?: 7 [apply-smob/1 #<catch-closure 55b8628b8600>]
In ice-9/boot-9.scm:
  66: 6 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 5 [eval # #]
In ice-9/boot-9.scm:
2404: 4 [save-module-excursion #<procedure 55b8628d89c0 at ice-9/boot-9.scm:4051:3 ()>]
4058: 3 [#<procedure 55b8628d89c0 at ice-9/boot-9.scm:4051:3 ()>]
In /home/<user>/path/tofile.scm:
   7: 2 [#<procedure 55b862cf46c0 ()>]
In system/foreign.scm:
 158: 1 [make-c-struct (int int) (300 43)]
In unknown file:
   ?: 0 [sizeof (int int)]

ERROR: In procedure sizeof:
ERROR: In procedure alignof: Wrong type argument in position 1: int

这个:

(list int int)

创建一个列表,其中包含先前定义的 int 值作为元素,而此:

'(int int)

创建一个包含两个 符号 作为元素的列表,它们不等价,请记住单引号是 shorthand 代表 (quote (int int)),而不是(list int int).