spot/tests/core/ltlfilt.test

#! /bin/sh
# -*- coding: utf-8 -*-
# Copyright (C) by the Spot authors, see the AUTHORS file for details.
#
# This file is part of Spot, a model checking library.
#
# Spot is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# Spot is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
# License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


# Check several options of ltlfilt

. ./defs || exit 1

set -e

checkopt()
{
  cat >exp
  run 0 ltlfilt "$@" formulas > out
  diff -u exp out
}

# The empty lines in the file are meant, we want to make sure that
# they are ignored.
cat >formulas <<EOF
GFa | FGb /* comment to ignore */
F(GFa | /* tricky /* comment */)*/ Gb)

F(b W GFa)
GFa | Gb
b W GFa
!{a;b*;c}!
!{a:b[*/*ignore me*/]:c/*ignore this comment*/}
a U Fb
G(a & Xb)
Xa
F(a & !Xa & Xb)
{a & {b|c} }
((a && b) U (! (X 1)))
((a && b) U (! (X[!] 1)))

{a[=2:3]}|->b
{a[->2:3]}|->b
{a[->1];a*}|->b  /* becomes {(!a)*;a[+]}|->b */
{a*;(!a)*;a*}|->b
{a*;(!a)[+];a*}|->b
{a[+];(!a)*;a*}|->b
{a*;(!a)*;a[+]}|->b
{a*;(!a)[+];a[+]}|->b
{a*;(!c)[+];a[+]}|->b
{a* ##0 b*}|->c
EOF

checkopt --boolean <<EOF
a & (b | c)
0
EOF

checkopt --bsize-min=2 --bsize-max=4 <<EOF
a U Fb
Xa
EOF

checkopt --size-min=2 --size-max=4 <<EOF
a U Fb
Xa
EOF

checkopt --eventual <<EOF
GFa | FGb
F(GFa | Gb)
F(b W GFa)
a U Fb
F(a & !Xa & Xb)
0
(a & b) U !X[!]1
EOF

checkopt --universal <<EOF
GFa | FGb
F(GFa | Gb)
GFa | Gb
G(a & Xb)
0
EOF

checkopt --eventual --universal <<EOF
GFa | FGb
F(GFa | Gb)
0
EOF

checkopt --suspendable <<EOF
GFa | FGb
F(GFa | Gb)
0
EOF

checkopt --stutter-invariant <<EOF
GFa | FGb
F(GFa | Gb)
F(b W GFa)
GFa | Gb
b W GFa
!{a:b[*]:c}
a U Fb
F(a & !Xa & Xb)
a & (b | c)
0
(a & b) U !X[!]1
{{!a}[*];a[+]}[]-> b
{a[*];{!a}[*];a[*]}[]-> b
{a[*];{!a}[+];a[*]}[]-> b
{a[+];{!a}[*];a[*]}[]-> b
{a[*];{!a}[*];a[+]}[]-> b
{a[*];{!a}[+];a[+]}[]-> b
{a[*]:b[*]}[]-> c
EOF

checkopt -c --stutter-invariant <<EOF
18
EOF

checkopt --syntactic-stutter-invariant <<EOF
GFa | FGb
F(GFa | Gb)
F(b W GFa)
GFa | Gb
b W GFa
a U Fb
a & (b | c)
0
{{!a}[*];a[+]}[]-> b
{a[*];{!a}[*];a[*]}[]-> b
{a[*];{!a}[+];a[*]}[]-> b
{a[+];{!a}[*];a[*]}[]-> b
{a[*];{!a}[*];a[+]}[]-> b
{a[*]:b[*]}[]-> c
EOF

checkopt --simplify <<EOF
F(GFa | Gb)
F(GFa | Gb)
F(b W GFa)
GFa | Gb
b W GFa
!a | X(!b R !c)
!{a:b[*]:c}
Fb
G(a & Xb)
Xa
F(a & X(!a & b))
a & (b | c)
0
0
a R (!a | X({a[->1..2]}[]-> (b & X(b W a))))
a R (!a | X({a[->1..2]}[]-> b))
a R (b W !a)
{a[*];{!a}[*];a[*]}[]-> b
!a R ((b & X(b W !a)) W a)
(b & X((b W !a) & ((b & X(b W !a)) W a))) W !a
!a R (a R (b W !a))
!a R (a | X(a R (b W !a)))
!a R (c | X(c R (b W !a)))
(c W !b) W !a
EOF

checkopt --simplify --eventual --unique <<EOF
F(GFa | Gb)
F(b W GFa)
Fb
F(a & X(!a & b))
0
EOF

checkopt --liveness <<EOF
GFa | FGb
F(GFa | Gb)
F(b W GFa)
GFa | Gb
b W GFa
a U Fb
F(a & !Xa & Xb)
EOF

checkopt --safety <<EOF
!({a;b[*];c}!)
G(a & Xb)
Xa
a & (b | c)
0
(a & b) U !X[!]1
{a[=2..3]}[]-> b
{a[->2..3]}[]-> b
{{!a}[*];a[+]}[]-> b
{a[*];{!a}[*];a[*]}[]-> b
{a[*];{!a}[+];a[*]}[]-> b
{a[+];{!a}[*];a[*]}[]-> b
{a[*];{!a}[*];a[+]}[]-> b
{a[*];{!a}[+];a[+]}[]-> b
{a[*];{!c}[+];a[+]}[]-> b
{a[*]:b[*]}[]-> c
EOF

checkopt --obligation <<EOF
!({a;b[*];c}!)
!{a:b[*]:c}
a U Fb
G(a & Xb)
Xa
F(a & !Xa & Xb)
a & (b | c)
0
(a & b) U !X[!]1
{a[=2..3]}[]-> b
{a[->2..3]}[]-> b
{{!a}[*];a[+]}[]-> b
{a[*];{!a}[*];a[*]}[]-> b
{a[*];{!a}[+];a[*]}[]-> b
{a[+];{!a}[*];a[*]}[]-> b
{a[*];{!a}[*];a[+]}[]-> b
{a[*];{!a}[+];a[+]}[]-> b
{a[*];{!c}[+];a[+]}[]-> b
{a[*]:b[*]}[]-> c
EOF

checkopt --guarantee <<EOF
!{a:b[*]:c}
a U Fb
Xa
F(a & !Xa & Xb)
a & (b | c)
0
(a & b) U !X[!]1
EOF

checkopt -v --ltl <<EOF
!({a;b[*];c}!)
!{a:b[*]:c}
{a[=2..3]}[]-> b
{a[->2..3]}[]-> b
{{!a}[*];a[+]}[]-> b
{a[*];{!a}[*];a[*]}[]-> b
{a[*];{!a}[+];a[*]}[]-> b
{a[+];{!a}[*];a[*]}[]-> b
{a[*];{!a}[*];a[+]}[]-> b
{a[*];{!a}[+];a[+]}[]-> b
{a[*];{!c}[+];a[+]}[]-> b
{a[*]:b[*]}[]-> c
EOF

checkopt -v --ap=3 <<EOF
GFa | FGb
F(GFa | Gb)
F(b W GFa)
GFa | Gb
b W GFa
a U Fb
G(a & Xb)
Xa
F(a & !Xa & Xb)
0
(a & b) U !X[!]1
{a[=2..3]}[]-> b
{a[->2..3]}[]-> b
{{!a}[*];a[+]}[]-> b
{a[*];{!a}[*];a[*]}[]-> b
{a[*];{!a}[+];a[*]}[]-> b
{a[+];{!a}[*];a[*]}[]-> b
{a[*];{!a}[*];a[+]}[]-> b
{a[*];{!a}[+];a[+]}[]-> b
EOF

checkopt --ap=2..3 <<EOF
GFa | FGb
F(GFa | Gb)
F(b W GFa)
GFa | Gb
b W GFa
!({a;b[*];c}!)
!{a:b[*]:c}
a U Fb
G(a & Xb)
F(a & !Xa & Xb)
a & (b | c)
(a & b) U !X[!]1
{a[=2..3]}[]-> b
{a[->2..3]}[]-> b
{{!a}[*];a[+]}[]-> b
{a[*];{!a}[*];a[*]}[]-> b
{a[*];{!a}[+];a[*]}[]-> b
{a[+];{!a}[*];a[*]}[]-> b
{a[*];{!a}[*];a[+]}[]-> b
{a[*];{!a}[+];a[+]}[]-> b
{a[*];{!c}[+];a[+]}[]-> b
{a[*]:b[*]}[]-> c
EOF

checkopt -v --stutter-invariant <<EOF
!({a;b[*];c}!)
G(a & Xb)
Xa
{a[=2..3]}[]-> b
{a[->2..3]}[]-> b
{a[*];{!c}[+];a[+]}[]-> b
EOF

checkopt --equivalent-to 'GFa | FGb' <<EOF
GFa | FGb
F(GFa | Gb)
F(b W GFa)
EOF

checkopt --ltl --from-ltlf=al <<EOF
al & (G(!al | F(a & al)) | F(al & G(!al | b))) & (al U G!al)
al & F(al & (G(!al | F(a & al)) | G(!al | b))) & (al U G!al)
al & F(al & ((!al | b) W G(!al | F(a & al)))) & (al U G!al)
al & (G(!al | F(a & al)) | G(!al | b)) & (al U G!al)
al & ((!al | b) W G(!al | F(a & al))) & (al U G!al)
al & (a U (al & F(al & b))) & (al U G!al)
al & G(!al | (a & X(!al | b))) & (al U G!al)
al & X(a | !al) & (al U G!al)
al & F(a & al & !X(a | !al) & X(!al | b)) & (al U G!al)
a & al & (b | c) & (al U G!al)
0
al & ((a & b) U (al & !Xal)) & (al U G!al)
EOF

checkopt --ltl --from-ltlf='!dead' <<EOF
!dead & (G(dead | F(a & !dead)) | F(!dead & G(b | dead))) & (!dead U Gdead)
!dead & F(!dead & (G(dead | F(a & !dead)) | G(b | dead))) & (!dead U Gdead)
!dead & F(!dead & ((b | dead) W G(dead | F(a & !dead)))) & (!dead U Gdead)
!dead & (G(dead | F(a & !dead)) | G(b | dead)) & (!dead U Gdead)
!dead & ((b | dead) W G(dead | F(a & !dead))) & (!dead U Gdead)
!dead & (a U (!dead & F(b & !dead))) & (!dead U Gdead)
!dead & G(dead | (a & X(b | dead))) & (!dead U Gdead)
!dead & X(a | dead) & (!dead U Gdead)
!dead & F(a & !dead & !X(a | dead) & X(b | dead)) & (!dead U Gdead)
a & !dead & (b | c) & (!dead U Gdead)
0
!dead & ((a & b) U (!dead & !X!dead)) & (!dead U Gdead)
EOF

cat >in <<EOF
a & Xb & c
a & b & GF(a | c) & FG(a | c)
b & GF(a | c) & FG(a | c)
G(d & e) | FG(Xf| !c) | h | i
b & !Xc & e & (f | g)
b & GF(a | c) & !GF!(a | c)
F(a <-> b) -> (c xor d)
(a & b & c) U (c & d & e)
(a & b & c) U !(a & b & c)
(a & b & c) U (!c & d & e)
((a | b) & c & d) U (!d & e & f)
((a | b) & d) U (!d & e & f)
(a & !a) | (b & !b) | (c & !c)
((a & !a) | (b & !b) | (c & !c)) U d
((a & !a) | (b & !b) | (c & e)) U d
((a & !b) | (!a & b)) U c
((a & !b) | (a->b)) U c
EOF

cat >exp <<EOF
p0 & Xp1
p0 & p1 & GF(p0 | p2) & FG(p0 | p2)
p0 & GFp1 & FGp1
p0 | Gp1 | FG(p2 | Xp3)
p0 | Gp1
(p0 & p1) U (p1 & p2)
(p0 & p1 & p2) U (!p0 | !p1 | !p2)
(p0 & p1) U (!p1 & p2)
(p0 & p1) U (!p0 & p2)
0
p0
p0 U p1
1 U p0
EOF

run 0 ltlfilt -u --nnf --relabel-bool=pnn in >out
diff exp out

cat >exp <<EOF
#define p0 (a && c)
#define p1 (b)
p0 && Xp1
#define p0 (a)
#define p1 (b)
#define p2 (c)
p0 && p1 && []<>(p0 || p2) && <>[](p0 || p2)
#define p0 (b)
#define p1 (a || c)
p0 && []<>p1 && <>[]p1
#define p0 (h || i)
#define p1 (d && e)
#define p2 (!c)
#define p3 (f)
p0 || []p1 || <>[](p2 || Xp3)
#define p0 ((c && !d) || (!c && d))
#define p1 ((a && !b) || (!a && b))
p0 || []p1
#define p0 (a && b)
#define p1 (c)
#define p2 (d && e)
(p0 && p1) U (p1 && p2)
#define p0 (a)
#define p1 (b)
#define p2 (c)
(p0 && p1 && p2) U (!p0 || !p1 || !p2)
#define p0 (a && b)
#define p1 (c)
#define p2 (d && e)
(p0 && p1) U (!p1 && p2)
#define p0 (d)
#define p1 (a || b)
#define p2 (e && f)
(p0 && p1) U (!p0 && p2)
false
#define p0 (d)
p0
#define p0 ((a && !a) || (b && !b) || (c && e))
#define p1 (d)
p0 U p1
#define p0 (c)
true U p0
EOF

run 0 ltlfilt -s -u --nnf --relabel-bool=pnn --define in >out
diff exp out

cat >exp <<EOF
#define p0 (a)
#define p1 (c)
#define p2 (b)
p0 && p1 && Xp2
#define p0 (a)
#define p1 (b)
#define p2 (c)
p0 && p1 && []<>(p0 || p2) && <>[](p0 || p2)
#define p0 (b)
#define p1 (a)
#define p2 (c)
p0 && []<>(p1 || p2) && <>[](p1 || p2)
#define p0 (h)
#define p1 (i)
#define p2 (d)
#define p3 (e)
#define p4 (c)
#define p5 (f)
p0 || p1 || [](p2 && p3) || <>[](!p4 || Xp5)
#define p0 (b)
#define p1 (e)
#define p2 (f)
#define p3 (g)
#define p4 (c)
p0 && p1 && (p2 || p3) && !Xp4
#define p0 (b)
#define p1 (a)
#define p2 (c)
p0 && []<>(p1 || p2) && ![]<>!(p1 || p2)
#define p0 (a)
#define p1 (b)
#define p2 (c)
#define p3 (d)
<>(p0 <-> p1) -> !(p2 <-> p3)
#define p0 (a)
#define p1 (b)
#define p2 (c)
#define p3 (d)
#define p4 (e)
(p0 && p1 && p2) U (p2 && p3 && p4)
#define p0 (a)
#define p1 (b)
#define p2 (c)
(p0 && p1 && p2) U !(p0 && p1 && p2)
#define p0 (a)
#define p1 (b)
#define p2 (c)
#define p3 (d)
#define p4 (e)
(p0 && p1 && p2) U (!p2 && p3 && p4)
#define p0 (c)
#define p1 (d)
#define p2 (a)
#define p3 (b)
#define p4 (e)
#define p5 (f)
(p0 && p1 && (p2 || p3)) U (!p1 && p4 && p5)
#define p0 (d)
#define p1 (a)
#define p2 (b)
#define p3 (e)
#define p4 (f)
(p0 && (p1 || p2)) U (!p0 && p3 && p4)
#define p0 (a)
#define p1 (b)
#define p2 (c)
(p0 && !p0) || (p1 && !p1) || (p2 && !p2)
#define p0 (a)
#define p1 (b)
#define p2 (c)
#define p3 (d)
((p0 && !p0) || (p1 && !p1) || (p2 && !p2)) U p3
#define p0 (a)
#define p1 (b)
#define p2 (c)
#define p3 (e)
#define p4 (d)
((p2 && p3) || (p0 && !p0) || (p1 && !p1)) U p4
#define p0 (a)
#define p1 (b)
#define p2 (c)
((p0 && !p1) || (!p0 && p1)) U p2
#define p0 (a)
#define p1 (b)
#define p2 (c)
((p0 && !p1) || (p0 -> p1)) U p2
EOF

run 0 ltlfilt -s -u --relabel=pnn --define in >out
diff exp out

cat >exp <<EOF
#define p0 (a & c)
#define p1 (b)
p0 & Xp1
#define p0 (a & b)
#define p1 (a | c)
p0 & GFp1 & FGp1
#define p0 (h | i)
#define p1 (d & e)
#define p2 (!c)
#define p3 (f)
p0 | Gp1 | FG(p2 | Xp3)
#define p0 (b & e & (f | g))
#define p1 (c)
p0 & !Xp1
#define p0 (b)
#define p1 (a | c)
p0 & GFp1 & !GF!p1
#define p0 (a <-> b)
#define p1 (c xor d)
Fp0 -> p1
#define p0 (a & b & c)
#define p1 (c & d & e)
p0 U p1
#define p0 (a & b & c)
p0 U !p0
#define p0 ((a & !a) | (b & !b) | (c & !c))
p0
EOF

run 0 ltlfilt -u --relabel-over=pnn --define in >out
diff exp out

toolong='((p2=0) * (p3=1))' # work around the 80-col check
cat >exp <<EOF
#define p0 (a=1)
#define p1 (c=1)
#define p2 (b=1)
(p0=1) * (p1=1) * (X(p2=1))
#define p0 (a=1)
#define p1 (b=1)
#define p2 (c=1)
(p0=1) * (p1=1) * (G(F((p0=1) + (p2=1)))) * (F(G((p0=1) + (p2=1))))
#define p0 (b=1)
#define p1 (a=1)
#define p2 (c=1)
(p0=1) * (G(F((p1=1) + (p2=1)))) * (F(G((p1=1) + (p2=1))))
#define p0 (h=1)
#define p1 (i=1)
#define p2 (d=1)
#define p3 (e=1)
#define p4 (c=1)
#define p5 (f=1)
(p0=1) + (p1=1) + (G((p2=1) * (p3=1))) + (F(G((p4=0) + (X(p5=1)))))
#define p0 (b=1)
#define p1 (e=1)
#define p2 (f=1)
#define p3 (g=1)
#define p4 (c=1)
(p0=1) * (p1=1) * ((p2=1) + (p3=1)) * (X(p4=0))
#define p0 (c=1)
#define p1 (d=1)
#define p2 (a=1)
#define p3 (b=1)
((p0=1) * (p1=0)) + ((p0=0) * (p1=1)) + (G(((p2=1) * (p3=0)) + $toolong))
#define p0 (a=1)
#define p1 (b=1)
#define p2 (c=1)
#define p3 (d=1)
#define p4 (e=1)
((p0=1) * (p1=1) * (p2=1)) U ((p2=1) * (p3=1) * (p4=1))
#define p0 (a=1)
#define p1 (b=1)
#define p2 (c=1)
((p0=1) * (p1=1) * (p2=1)) U ((p0=0) + (p1=0) + (p2=0))
#define p0 (a=1)
#define p1 (b=1)
#define p2 (c=1)
#define p3 (d=1)
#define p4 (e=1)
((p0=1) * (p1=1) * (p2=1)) U ((p2=0) * (p3=1) * (p4=1))
#define p0 (c=1)
#define p1 (d=1)
#define p2 (a=1)
#define p3 (b=1)
#define p4 (e=1)
#define p5 (f=1)
((p0=1) * (p1=1) * ((p2=1) + (p3=1))) U ((p1=0) * (p4=1) * (p5=1))
#define p0 (d=1)
#define p1 (a=1)
#define p2 (b=1)
#define p3 (e=1)
#define p4 (f=1)
((p0=1) * ((p1=1) + (p2=1))) U ((p0=0) * (p3=1) * (p4=1))
#define p0 (a=1)
#define p1 (b=1)
#define p2 (c=1)
((p0=1) * (p0=0)) + ((p1=1) * (p1=0)) + ((p2=1) * (p2=0))
#define p0 (a=1)
#define p1 (b=1)
#define p2 (c=1)
#define p3 (d=1)
(((p0=1) * (p0=0)) + ((p1=1) * (p1=0)) + ((p2=1) * (p2=0))) U (p3=1)
#define p0 (a=1)
#define p1 (b=1)
#define p2 (c=1)
#define p3 (e=1)
#define p4 (d=1)
(((p2=1) * (p3=1)) + ((p0=1) * (p0=0)) + ((p1=1) * (p1=0))) U (p4=1)
#define p0 (a=1)
#define p1 (b=1)
#define p2 (c=1)
(((p0=1) * (p1=0)) + ((p0=0) * (p1=1))) U (p2=1)
#define p0 (a=1)
#define p1 (b=1)
#define p2 (c=1)
((p0=0) + (p1=1) + ((p0=1) * (p1=0))) U (p2=1)
EOF
run 0 ltlfilt -p --wring -u --nnf --relabel=pnn --define in >out
diff exp out

run 0 ltlfilt -0 in > out
$PERL -i -pe 's/\0/@\n/g' out
cat >exp <<EOF
a & c & Xb@
a & b & GF(a | c) & FG(a | c)@
b & GF(a | c) & FG(a | c)@
h | i | G(d & e) | FG(!c | Xf)@
b & e & (f | g) & !Xc@
b & GF(a | c) & !GF!(a | c)@
F(a <-> b) -> (c xor d)@
(a & b & c) U (c & d & e)@
(a & b & c) U !(a & b & c)@
(a & b & c) U (!c & d & e)@
(c & d & (a | b)) U (!d & e & f)@
(d & (a | b)) U (!d & e & f)@
(a & !a) | (b & !b) | (c & !c)@
((a & !a) | (b & !b) | (c & !c)) U d@
((a & !a) | (b & !b) | (c & e)) U d@
((a & !b) | (!a & b)) U c@
((a -> b) | (a & !b)) U c@
EOF
diff exp out

SPOT_STUTTER_CHECK=0 \
ltlfilt --stutter-invariant -f '!{a:b*:c}' 2> stderr && exit 1
test $? = 2
grep 'non-LTL' stderr

SPOT_STUTTER_CHECK=555 \
ltlfilt --stutter-invariant -f '!{a:b*:c}' 2> stderr && exit 1
test $? = 2
grep 'invalid' stderr

SPOT_STUTTER_CHECK=5 \
ltlfilt --stutter-invariant -f '!{a:b*:c}'

# This one was incorrectly diagnosed as stutter invariant because of a
# bug in the bitvectors.
ltlfilt --stutter-invariant -f 'F(a & XXXXXX!a)' && exit 1

ltlfilt --syntactic-stutter-invariant -f 'GFa <-> GFb'
ltlfilt --syntactic-stutter-invariant -f 'GXa <-> GFb' && exit 1


ltlfilt -c -o 'foo' -f a 2>stderr && exit 1
grep 'ltlfilt: options --output and --count are incompatible' stderr

out=`ltlfilt -f 'G(a xor b) -> F(c <-> Xd)' --unabbreviate='^iF'`
exp='(1 U (c <-> Xd)) | !G!(a <-> b)'
test "$out" = "$exp"

ltlfilt -f 'GF"a\"\\b"' > out
test "`cat out`" = 'GF"a\"\\b"'

ltlfilt --lbt-input -f 'G F "a\"\\b"' -l > out
test "`cat out`" = 'G F "a\"\\b"'


ltlfilt --size=foo=2..3  2>stderr && exit 1
grep 'invalid range.*should start with' stderr


cat >out <<EOF
test1,"""a b"" U c"
"""a b"" U c",test2
EOF
ltlfilt out/1 > out.1
ltlfilt out/2 > out.2
diff out out.1
diff out out.2

test a = `ltlfilt -r2 -f a`
ltlfilt -r4 -f a 2>err && exit 1
grep "invalid simplification level '4'" err
ltlfilt -ra -f a 2>err && exit 1
grep "invalid simplification level 'a'" err

ltlfilt --ignore-errors -f 'F' > out 2> out && exit 1
test $? = 1
cat >exp <<EOF
EOF
diff out exp

run 2 ltlfilt --drop-errors -f 'F' > out
cat >exp <<EOF
EOF
diff out exp

run 2 ltlfilt --skip-errors -f 'F' > out
cat >exp <<EOF
F
EOF
diff out exp

f1=`genltl --pps-arbiter-standard=2`
f2=`genltl --pps-arbiter-strict=2`
run 1 ltlfilt -f "$f2" --implied-by "$f1"
run 0 ltlfilt -f "$f1" --implied-by "$f2"


# Reading two different columns of the same file
echo a,b > file
run 0 ltlfilt -Ffile/1 -Ffile/2 --stats=%f >out
cat >expected <<EOF
a
b
EOF
diff expected out
# We used to have a bug where a column specification on one file
# would stick to the rest of the file unless overridden.
run 2 ltlfilt -Ffile/1 -Ffile
: