Better psyntax error messages

[higepon]

Goal

• Make psyntax error message as good as mosh backend. Show file name and line number as much as possible.

Todo

• Remove bad set-source-info! call and preserve source-info.
• Improve "invalid syntax" case
  • This was fixed in Show file & line nuber for invalid syntax error #81
• Improve "macro error" case
• Have assert(ae) in build-lambda and fix it.
• Improve "runtime error" case
  • This is 1 in the example.
  • Commenting out set-source-info #f didn't work.
  • Investigation notes
    • This works with mosh -5
    • The error is shown using source-info in closure.
    • Fixed https://github.com/higepon/mosh/actions/runs/3071543619
• Improve "invalid syntax in library" case.
• Improve "runtime error in library" case.
• Add tests for the cases above.
• Hopefully we should follow whatever psyntax has.

Some examples

1

(import (rnrs) (mosh))

(define (a) 3)

(display (a 3))

 Condition components:
 1. &assertion
 2. &who             who: "(a) : unknown location"
 3. &message         message: "wrong number of arguments (required 0, got 1)"
 4. &irritants       irritants: ((3))

2

(import (rnrs))

(define-syntax a
  (syntax-rules ()
    ((_) 3)))

(display (a 4))

./mosh r.scm 
 Condition components:
 1. &message       message: "invalid syntax"
 2. &syntax        form: (a 4)
                   subform: #f

 Exception:
     error in raise: returned from non-continuable exception