FMSLogo Code

Add a nascent CSS for styling the HTML generated from logohelp.xml.

Change lrepeat() and lforever() to return Unbound on error, instead of NIL. This follows the pattern of all other functions.

Also, improve some variable names.

Add regression tests for FOREVER.

Add a test for when the body of a REPEAT throws an error.
Fix the test for when the body of a REPEAT stops.

Update the version to 6.10.1+

Add regression tests for RUNRESUT, including one for bug #1547408; 'RUNRESULT {1}' crashes FMSLogo.

Minor changes to make the code a little clearer. This is mostly restructuring code into an equivalent (but clearer) form.

Add regression tests for RUNRESUT, including one for bug #1547408; 'RUNRESULT {1}' crashes FMSLogo.

Correction: I did not fix bug #1458661.
I fixed bug #1547408; 'RUNRESULT {1}' no longer crashes FMSLogo.

Fix bug #1458661; Macros that output nothing no longer crash FMSLogo.

Here is a description of the bug:
RUNRESULTcreate a continuation node. Continuation nodes store a
number, not a NODE* in their "CAR" field (the ID of where
they should continue evaluating from). Normally, this is
overwritten with NIL when the continuation is used.
However, if there's an error, the continuation is cleaned up
before the CAR field is cleared to NIL. And there was a bug
in gc(), which is where all NODE* are cleaned up, that tried
to free the CAR of continuation nodes. This resulted in an
access violation, as you obviously can't free() the number 11.

The fix is to only free the CDR of a continuation NODE* in gc().

This fix will be released in FMSLogo 6.11.0.