Anonymous functions

[Daniel Kraft]

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Hi Jordi and all,

there's at least some progress towards anonymous functions -- and
actually the problem with missing line/column was that it is not set in
make_anon_fcn_handle in the parser (this is a FIXME).  I think the
current solution is also not perfect, since the column is not correct
(i.e., the position is that of the end of the definition, not the @
sign).  But it's a long time since I used yacc/bison, so I was not sure
how to get the location of the @ itself.

For now, this gives at least some information, and output of the form
"anonymous@:line:column" in the profiler for different anonymous functions.

I also tried to get the file name in there, but if I uncomment the line
near the end of make_anon_fcn_handle (line 2098 of oct-parse.yy with my
patch applied), I can no longer call the function: "no longer valid
function handle" at line 187 of ov-fcn-handle.cc.  It seems that setting
the file-name makes fcn.is_defined() false -- I've no idea why.  Does
this ring a bell somewhere?

For now, I provide the attached patch (since it is still work in
progress, I didn't commit it to my hg history and it's a raw patch; hope
that's ok).  It would be really cool if someone had an idea why
is_defined() becomes false when I set the file-name.  If not, I'll try
to figure that out myself.

Yours,
Daniel

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