Flowlog All, current items.

18: * Unexpected operator

?- current_op(Pri,Fix,'|').
   Pri = 1150, Fix = xfy
;  Pri = 1150, Fix = fy, unexpected.

There must not be any such operator. Only the infix '|' is possible. See Cor.2#C2 and 8.14.3.4. Otherwise Flowflog is correct.

?- op(1150,fy,'|').
   error(permission_error(create,operator,'|'),op/3). % nice
?- op(0,fy,'|').
   true. % nice

v4.9.8

v4.9.6

v4.9.3

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
?- append("a",Ys,Zs).
   false, unexpected.

v4.8.0

v4.7.2

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
   Ys = _1, Zs = [a|_2], unexpected.

(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.

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	2026-05-13 07:59	13K