The "assert" construct generates an exception which contains the file
name and line number where the "assert" appears.

However, when a preprocessor is used (with the -pp option), the file name
and line number that are recorded are relative to the preprocessor
output file and not to original source file, even when the 
'# linenum "filename"' directives are inserted in the preprocessor
output.

A quick scanner of ocaml-3.02/parsing/lexer.mll seems to indicate that
the line directive is completely ignored.

milhouse$ uname -a
CYGWIN_NT-5.0 MILHOUSE 1.3.2(0.39/3/2) 2001-05-20 23:28 i686 unknown
milhouse$ ocamlc -v
The Objective Caml compiler, version 3.02
Standard library directory: /usr/local/lib/ocaml
milhouse$ 
milhouse$ 
milhouse$ cat preproc.sh 
#! /bin/sh

echo '# 1 "'$1'"'
cat $1
milhouse$ 
milhouse$ 
milhouse$ cat assert_bug.ml
assert false;;
milhouse$ 
milhouse$ 
milhouse$ ocamlc -o assert_bug.exe -pp './preproc.sh' assert_bug.ml 
milhouse$ ./assert_bug.exe 
Fatal error: uncaught exception Assert_failure("/home/stodghil/tmp/camlpp0", 20, 32)
milhouse$ 

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