Re: [TCLCORE] TIP #329 [try] updated

[Joe E. <jen...@fl...>]

Donal K. Fellows wrote:
> Andreas Leitgeb wrote:
> > A few minor questions about implementation (I'm just curious):
> >   How does the byte-coded "lrange" thing deal with bad lists
> >     (i.e. something like "{fsg fds}dsfa {" ) ?  The  TIP specifies
> >     that no errors be thrown for non-list errorCodes or patterns.
>
> Ooops, missed that. I'll change that when I call the vote because it's
> not a good decision. The list interpretation of error codes has been
> assumed for well over a decade, so a non-list error code is an error itself.


The current specification (r1.7, section "Handlers", "Notes & clarifications",
bullet point 5):

| If any errorcode happens to be not a list, a trap handler will be unable
| to process it.

looks right to me.

If you rephrase it, please ensure that the new text
continues to specify that in the following:

	proc throw-bad-errorinfo {} {
	    return -code error -errorinfo "not { a list" "bad"
	}

	try {
	    throw-bad-errorinfo
	} trap {whatever} {} {
	    # (1)
	} on error {msg opts} {
	    # (2)
	} finally {
	    # (3)
	}

clauses (2) and (3) are executed.


--JE