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Import Debian changes 20180207-1
[hcoop/debian/mlton.git]
/
regression
/
taut.sml
1
(*
a tautology checker
*)
2
3
datatype
t
=
4
Base
of
bool
5
| Fun
of
bool
->
t
6
7
val rec
taut
=
8
fn
Base b
=>
b
9
| Fun f
=>
taut
(
f
true
)
andalso
taut
(
f
false
)
10
11
val rec
bigTrue
=
12
fn
0
=>
Base
true
13
| n
=>
Fun
(
fn
_
=>
bigTrue
(
n
-
1
))
14
15
val
_
=
taut
(
bigTrue
12
)
16