[Larceny-users] understanding compiler messages

[Sven Hartrumpf]

Hi.

I am porting a large R5RS program to R7RS, module by module.
But I am stuck at the following cryptic message:

> rlwrap larceny -r7rsc
Larceny v0.98+ "General Ripper" (Jan 12 2016 13:24:38, precise:Linux:unified)
larceny.heap, built on Di 12. Jan 13:27:54 CET 2016

> (import (larceny compiler))

> (compile-file "general.sld")
Compiling general.sld
Reading larceny.scm
Reading general.scm


Error: unhandled condition:
Compound condition has these components: 
#<record &assertion>
#<record &who>
    who : "car"
#<record &message>
    message : "car: not a pair: #f \n"

Entering debugger; type "?" for help.
debug> ?

  a           Abort (exit from Larceny).
  b           Print backtrace of continuation.
  c           Print source code (if available).
  d           Down to previous activation record.
  e n expr    Expr is evaluated in the current interaction environment 
              and must evaluate to a procedure.   It is passed the contents
              of slot n from the current activation record, and the result, 
              if not unspecified, is printed.
  e (n1 ... nk) expr
              Expr is evaluated in the current interaction environment and
              must evaluate to a procedure.   It is passed the contents of
              slots n1 through nk from the current activation record, and 
              the result, if not unspecified, is printed.
  i n         Inspect the procedure in slot n of the current activation record.
  i @         Inspect the active procedure.
  n           Enter a nested REPL.
  q           Quit the debugger and abort the computation.
  r           Return from the debugger and continue the computation.
  s           Summarize the contents of the current activation record.
  u           Up to the next activation record.
  x           Examine the contents of the current activation record.

The b, d, and u commands can be prefixed with a count, for example, 
`5 u' moves up five activation records, and `10 b' displays the next 
10 activation records.  The default for b is to display all the 
activations; the default count for d and u is 1.

debug> b
=> compiled procedure debug/enter-debugger 
   compiled procedure #f 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   system continuation
   compiled procedure compress (r6rs-expander.sch : 213 : 1)
   compiled procedure compress (r6rs-expander.sch : 213 : 1)
   compiled procedure compress (r6rs-expander.sch : 213 : 1)
   compiled procedure #f (r6rs-expander.sch : 1958 : 37)
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure #f (r6rs-expander.sch : 1156 : 17)
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure #f (r6rs-expander.sch : 2774 : 8)
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure #f (r6rsmode.sch : 593 : 13)
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure call-with-values 
   compiled procedure repl 
   compiled procedure r5rs-entry-point 
   compiled procedure call-with-values 
   compiled procedure #f 
   compiled procedure interactive-entry-point 
   system continuation
debug> #<EOF>

How can I track this problem?

Ciao
Sven