How do I make a fuel annotation for a templated function?
I would like to write Dafny some code with fuel annotations, like the following:
predicate {:fuel 0,0} eq<A>(x: A, y: A)
{
x == y
}
lemma {:fuel eq,1,2} reflexive<A>(x: A)
ensures eq(x, x)
{
}
Unfortunately, I get an error message:
templates.dfy(6,13): Error: type '?' to the predicate 'eq' is not determined
templates.dfy(6,13): Error: the type of this expression is underspecified
Well, it looks like I just need to specify the type argument to eq. But the 'obvious' approach doesn't work. This code,
predicate {:fuel 0,0} eq<A>(x: A, y: A)
{
x == y
}
lemma {:fuel eq<A>,1,2} reflexive<A>(x: A)
ensures eq(x, x)
{
}
gives the error message:
templates.dfy(6,17): Error: this operator chain cannot continue with a descending operator
templates.dfy(6,18): Error: invalid UnaryExpression
It is possible to accomplish fuel annotations with templated functions in this manner?
dafny
asked Nov 21 at 1:14
tjhance
3671212
add a comment |
I would like to write Dafny some code with fuel annotations, like the following:
predicate {:fuel 0,0} eq<A>(x: A, y: A)
{
x == y
}
lemma {:fuel eq,1,2} reflexive<A>(x: A)
ensures eq(x, x)
{
}
Unfortunately, I get an error message:
templates.dfy(6,13): Error: type '?' to the predicate 'eq' is not determined
templates.dfy(6,13): Error: the type of this expression is underspecified
Well, it looks like I just need to specify the type argument to eq. But the 'obvious' approach doesn't work. This code,
predicate {:fuel 0,0} eq<A>(x: A, y: A)
{
x == y
}
lemma {:fuel eq<A>,1,2} reflexive<A>(x: A)
ensures eq(x, x)
{
}
gives the error message:
templates.dfy(6,17): Error: this operator chain cannot continue with a descending operator
templates.dfy(6,18): Error: invalid UnaryExpression
It is possible to accomplish fuel annotations with templated functions in this manner?
dafny
asked Nov 21 at 1:14
tjhance
3671212
add a comment |
I would like to write Dafny some code with fuel annotations, like the following:
predicate {:fuel 0,0} eq<A>(x: A, y: A)
{
x == y
}
lemma {:fuel eq,1,2} reflexive<A>(x: A)
ensures eq(x, x)
{
}
Unfortunately, I get an error message:
templates.dfy(6,13): Error: type '?' to the predicate 'eq' is not determined
templates.dfy(6,13): Error: the type of this expression is underspecified
Well, it looks like I just need to specify the type argument to eq. But the 'obvious' approach doesn't work. This code,
predicate {:fuel 0,0} eq<A>(x: A, y: A)
{
x == y
}
lemma {:fuel eq<A>,1,2} reflexive<A>(x: A)
ensures eq(x, x)
{
}
gives the error message:
templates.dfy(6,17): Error: this operator chain cannot continue with a descending operator
templates.dfy(6,18): Error: invalid UnaryExpression
It is possible to accomplish fuel annotations with templated functions in this manner?
dafny
asked Nov 21 at 1:14
tjhance
3671212
I would like to write Dafny some code with fuel annotations, like the following:
predicate {:fuel 0,0} eq<A>(x: A, y: A)
{
x == y
}
lemma {:fuel eq,1,2} reflexive<A>(x: A)
ensures eq(x, x)
{
}
Unfortunately, I get an error message:
templates.dfy(6,13): Error: type '?' to the predicate 'eq' is not determined
templates.dfy(6,13): Error: the type of this expression is underspecified
Well, it looks like I just need to specify the type argument to eq. But the 'obvious' approach doesn't work. This code,
predicate {:fuel 0,0} eq<A>(x: A, y: A)
{
x == y
}
lemma {:fuel eq<A>,1,2} reflexive<A>(x: A)
ensures eq(x, x)
{
}
gives the error message:
templates.dfy(6,17): Error: this operator chain cannot continue with a descending operator
templates.dfy(6,18): Error: invalid UnaryExpression
It is possible to accomplish fuel annotations with templated functions in this manner?
dafny
dafny
asked Nov 21 at 1:14
tjhance
3671212
asked Nov 21 at 1:14
tjhance
3671212
asked Nov 21 at 1:14
tjhance
3671212
asked Nov 21 at 1:14
tjhance
3671212
asked Nov 21 at 1:14
tjhance
3671212
3671212
add a comment |
add a comment |
1 Answer
1
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oldest
votes
The "obvious" way to do it is indeed the way to do it. The parsing error messages you're getting were fixed in Dafny version 2.2.0 (more precisely, in a 10 July 2018 commit).
answered Nov 27 at 22:23
Rustan Leino
50435
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The "obvious" way to do it is indeed the way to do it. The parsing error messages you're getting were fixed in Dafny version 2.2.0 (more precisely, in a 10 July 2018 commit).
answered Nov 27 at 22:23
Rustan Leino
50435
add a comment |
The "obvious" way to do it is indeed the way to do it. The parsing error messages you're getting were fixed in Dafny version 2.2.0 (more precisely, in a 10 July 2018 commit).
answered Nov 27 at 22:23
Rustan Leino
50435
add a comment |
The "obvious" way to do it is indeed the way to do it. The parsing error messages you're getting were fixed in Dafny version 2.2.0 (more precisely, in a 10 July 2018 commit).
answered Nov 27 at 22:23
Rustan Leino
50435
The "obvious" way to do it is indeed the way to do it. The parsing error messages you're getting were fixed in Dafny version 2.2.0 (more precisely, in a 10 July 2018 commit).
answered Nov 27 at 22:23
Rustan Leino
50435
answered Nov 27 at 22:23
Rustan Leino
50435
answered Nov 27 at 22:23
Rustan Leino
50435
answered Nov 27 at 22:23
Rustan Leino
50435
50435
add a comment |
add a comment |
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