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Simon Spies
stdpp
Commits
6fe27bb5
Commit
6fe27bb5
authored
Feb 25, 2016
by
Ralf Jung
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improve f_equiv and solve_proper; use them in a few more places
parent
eb091d1d
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14 additions
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+14
3
theories/tactics.v
theories/tactics.v
+14
3
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theories/tactics.v
View file @
6fe27bb5
...
...
@@ 257,22 +257,28 @@ Ltac f_equiv :=
let
H
:
=
fresh
"Proper"
in
assert
(
Proper
(
R
==>
R
==>
R
)
f
)
as
H
by
(
eapply
_
)
;
apply
H
;
clear
H
;
f_equiv
(* Next, try to infer the relation *)
(* Next, try to infer the relation. Unfortunately, there is an instance
of Proper for (eq ==> _), which will always be matched. *)
(* TODO: Can we exclude that instance? *)
(* TODO: If some of the arguments are the same, we could also
query for "pointwise_relation"'s. But that leads to a combinatorial
explosion about which arguments are and which are not the same. *)


?R
(
?f
?x
)
(
?f
_
)
=>
let
R1
:
=
fresh
"R"
in
let
H
:
=
fresh
"
Proper
"
in
let
R1
:
=
fresh
"R"
in
let
H
:
=
fresh
"
HProp
"
in
let
T
:
=
type
of
x
in
evar
(
R1
:
relation
T
)
;
assert
(
Proper
(
R1
==>
R
)
f
)
as
H
by
(
subst
R1
;
eapply
_
)
;
subst
R1
;
apply
H
;
clear
H
;
f_equiv


?R
(
?f
?x
?y
)
(
?f
_
_
)
=>
let
R1
:
=
fresh
"R"
in
let
R2
:
=
fresh
"R"
in
let
H
:
=
fresh
"
Proper
"
in
let
H
:
=
fresh
"
HProp
"
in
let
T1
:
=
type
of
x
in
evar
(
R1
:
relation
T1
)
;
let
T2
:
=
type
of
y
in
evar
(
R2
:
relation
T2
)
;
assert
(
Proper
(
R1
==>
R2
==>
R
)
f
)
as
H
by
(
subst
R1
R2
;
eapply
_
)
;
subst
R1
R2
;
apply
H
;
clear
H
;
f_equiv
(* In case the function symbol differs, but the arguments are the same,
maybe we have a pointwise_relation in our context. *)

H
:
pointwise_relation
_
?R
?f
?g

?R
(
?f
?x
)
(
?g
?x
)
=>
apply
H
;
f_equiv
end

idtac
(* Let the user solve this goal *)
].
...
...
@@ 289,6 +295,10 @@ Ltac solve_proper :=
end
;
(* Unfold the head symbol, which is the one we are proving a new property about *)
lazymatch
goal
with


?R
(
?f
_
_
_
_
_
_
_
_
)
(
?f
_
_
_
_
_
_
_
_
)
=>
unfold
f


?R
(
?f
_
_
_
_
_
_
_
)
(
?f
_
_
_
_
_
_
_
)
=>
unfold
f


?R
(
?f
_
_
_
_
_
_
)
(
?f
_
_
_
_
_
_
)
=>
unfold
f


?R
(
?f
_
_
_
_
_
)
(
?f
_
_
_
_
_
)
=>
unfold
f


?R
(
?f
_
_
_
_
)
(
?f
_
_
_
_
)
=>
unfold
f


?R
(
?f
_
_
_
)
(
?f
_
_
_
)
=>
unfold
f


?R
(
?f
_
_
)
(
?f
_
_
)
=>
unfold
f
...
...
@@ 296,6 +306,7 @@ Ltac solve_proper :=
end
;
solve
[
f_equiv
].
(** Given a tactic [tac2] generating a list of terms, [iter tac1 tac2]
runs [tac x] for each element [x] until [tac x] succeeds. If it does not
suceed for any element of the generated list, the whole tactic wil fail. *)
...
...
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