将字符串原语函数导入 MIT 方案
Import String Primitive Functions into MIT Scheme
使用 Scheme 的入门级编程课程通常使用包含 first 和 bf 等原始函数的版本（描述为 here）。
由于 this question，我在本地有 MIT Scheme 运行，但是当我尝试使用这些原始函数之一时它会抛出以下错误。
MIT/GNU Scheme running under OS X
Type `^C' (control-C) followed by `H' to obtain information about interrupts.
Copyright (C) 2014 Massachusetts Institute of Technology
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Image saved on Saturday May 17, 2014 at 2:39:25 AM
Release 9.2 || Microcode 15.3 || Runtime 15.7 || SF 4.41 || LIAR/x86-64 4.118
Edwin 3.116
1 ]=> (first 'hello)
;The object hello, passed as an argument to safe-car, is not a pair.
;To continue, call RESTART with an option number:
; (RESTART 1) => Return to read-eval-print level 1.
如何将这些原始函数导入方案中使用？
见510页，附件说明需要下载支持码：
https://people.eecs.berkeley.edu/~bh/pdf/ssch27.pdf
FWIW 有一个适用于 Racket 的 Simply Scheme 包
使用 Scheme 的入门级编程课程通常使用包含 first 和 bf 等原始函数的版本（描述为 here）。
由于 this question，我在本地有 MIT Scheme 运行，但是当我尝试使用这些原始函数之一时它会抛出以下错误。
MIT/GNU Scheme running under OS X
Type `^C' (control-C) followed by `H' to obtain information about interrupts.
Copyright (C) 2014 Massachusetts Institute of Technology
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Image saved on Saturday May 17, 2014 at 2:39:25 AM
Release 9.2 || Microcode 15.3 || Runtime 15.7 || SF 4.41 || LIAR/x86-64 4.118
Edwin 3.116
1 ]=> (first 'hello)
;The object hello, passed as an argument to safe-car, is not a pair.
;To continue, call RESTART with an option number:
; (RESTART 1) => Return to read-eval-print level 1.
如何将这些原始函数导入方案中使用？
见510页，附件说明需要下载支持码：
https://people.eecs.berkeley.edu/~bh/pdf/ssch27.pdf
FWIW 有一个适用于 Racket 的 Simply Scheme 包