Syntax error on load

[kamahen]

Syntax error on load

[eddiec]

Hmm, so I just noticed the comment on the front page about 8.3.something. I hadn't realised my ubuntu installation was that
far behind. I might have a bash at installing swipl manually.

[kamahen]

The standard version of SWI-Prolog that comes with Ubuntu tends to be somewhat old.
However, the "=>" operator is quite new and I shouldn't have made it a requirement. (It's only in the latest "development" version of swipl)
I'll look at the code and figure out a way to remove "=>".

[eddiec]

Many thanks.
On checking I find that 8.2.4 is actually the latest stable.
At this point I'm simply trying to understand the idea and whether it's what I need for the program I'm building so I imagine
everything will have fixed itself by the time I get my head round it!

[kamahen]

A slightly older version of EDCG should be fine for you, but I'll have to figure out how to make the current EDCG backward-compatible.

The "development" version of SWI-Prolog is actually very stable. There are instructions for installing it here (no need to install manually): https://www.swi-prolog.org/build/PPA.html

[kamahen]

As a quick fix, try this before :- use module(library(edcg)).:

:- op(1200, xfx, '=>').

For more details on what this does: https://www.swi-prolog.org/pldoc/man?section=operators

[eddiec]

TBH, I did that in the source before reporting it - blindly pattern matching!! It loaded and worked with the "len" example on the front page. Obviously though I had no idea of whether it would bite me later. I'll hopefully be exploring the whole thing further over the weekend. Thanks, Eddie

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[kamahen]

Fixed with commit 3b3fb89
Please re-open if you still have a problem.

[kamahen]

I've added another example:
https://github.com/kamahen/edcg/blob/master/t/puzzle.pl