Flowlog All, current items.

v4.9.0

For the moment, I will stop testing Flowlog, since the most elementary items are ignored. I will look at s#1 only and update other issues only after this has been addressed.

17: * append/3 entirely disfunctional

?- append("ab","cd",L).
   false, unexpected.
   L = "abcd". % expected, but not found
?- append([],Ys,Zs).
Segmentation fault (core dumped)
   Ys = Zs. % expected, but not found

v4.8.0

v4.7.2

16: * Elementary read syntax still not supported

like s#28 (all these tables should be machine readable by anyone including LLMs)

15: * No -0.0

ISO Prolog does not contain -0.0 as a number distinct from 0.0. Therefore, they must be identical and print identically.

?- 0.0 == -0.0.
   true. % good
?- writeq(-0.0).
   outputs("-0.0"), unexpected.
   outputs("0.0"). % expected, but not found

14: * number_chars/2 different to read-syntax

?- writeq(010).
10   true. % nice
?- number_chars(N,"010").
   N = 8, unexpected.
?- number_chars(N,"08").
   N = 8. % expected, but not found
   syntax_error(...), unexpected.

v4.7.1

v4.6.14

v4.6.13

v4.6.10

v4.6.8

v4.6.6

11: * append/3 does not work

(Example from the Prolog prologue)

?- append([a], Ys, Zs).
Segmentation fault (core dumped), unexpected.
   Zs = [a|Ys]. % expected, but not found

(above with default. Does work with interp. With wam:)

?- append([a], Ys, Zs).
   Ys = Xs, Zs = [a|Xs], unexpected.

Where does Xs come from?

---

v4.6.5

9: * git clone problem with old system

ulrich@p0:/tmp$ git clone https://git.liminal.cafe/byakuren/flowlog.git
Cloning into 'flowlog'...
fatal: unable to access 'https://git.liminal.cafe/byakuren/flowlog.git/': gnutls_handshake() failed: Handshake failed
ulrich@p0:/tmp$ cat /etc/issue
Ubuntu 14.04.6 LTS \n \l

This does not happen with github. There I follow various systems like Scryer, Trealla.

6: * writeq ignores operators

Before improving read-ing, consider writeq-ing. Such that you always write valid syntax. So the first to address would be:

1. s#1,
2. s#13,
3. s#27,
4. s#35,
5. s#36

5: * testing number_chars/2

Because of #3 and #4, I cannot Now I use the current test table, so I resorted to like the old one. Please go through it. (Numbers are the same) Problems start with #9, #17, #21.

ulrich@gupu:/opt/gupu/flowlog$ ./flowlog 
Flowlog (pthreads)
Type 'help.' for help, 'halt.' to exit.
?- number_chars(1,[_,[]]).
error(instantiation_error,/(number_chars,2)), unexpected.
   type_error(character,[]). % expected, but not found
?- number_chars(N,['3',.]).
N = 3.0, unexpected.
   syntax_error(...). % expected, but not found
?- number_chars(N,[-,' ','1']).
flowlog: fatal error (240): flowlog: unexpected token while parsing term

2: * compilation on older system does not work

ulrich@p0:/opt/gupu/flowlog$ make
cc -O2 -Wall -Wextra -pthread flowlog.c -lm  -o flowlog
flowlog.c:41:23: fatal error: stdatomic.h: No such file or directory
 #include 
                       ^
compilation terminated.
make: *** [flowlog] Error 1
ulrich@p0:/opt/gupu/flowlog$ cc --version
cc (Ubuntu 4.8.4-2ubuntu1~14.04.4) 4.8.4
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

wget https://web.liminal.cafe/~byakuren/flowlog/flowlog.tar.gz
git clone https://git.liminal.cafe/byakuren/flowlog.git
make

	Name	Last modified	Size	Description
	Parent Directory		-
	name.txt	2026-01-05 11:38	8
	lr.pl	2026-01-06 20:51	343
	FLOWLOG-HEADER.html	2026-03-25 07:23	12K