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 '18 at 1:14
tjhancetjhance
3721212
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 '18 at 1:14
tjhancetjhance
3721212
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 '18 at 1:14
tjhancetjhance
3721212
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 '18 at 1:14
tjhancetjhance
3721212
asked Nov 21 '18 at 1:14
tjhancetjhance
3721212
asked Nov 21 '18 at 1:14
tjhancetjhance
3721212
asked Nov 21 '18 at 1:14
tjhancetjhance
3721212
asked Nov 21 '18 at 1:14
tjhancetjhance
3721212
3721212
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 '18 at 22:23
Rustan LeinoRustan Leino
60945
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 '18 at 22:23
Rustan LeinoRustan Leino
60945
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 '18 at 22:23
Rustan LeinoRustan Leino
60945
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 '18 at 22:23
Rustan LeinoRustan Leino
60945
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 '18 at 22:23
Rustan LeinoRustan Leino
60945
answered Nov 27 '18 at 22:23
Rustan LeinoRustan Leino
60945
answered Nov 27 '18 at 22:23
Rustan LeinoRustan Leino
60945
answered Nov 27 '18 at 22:23
Rustan LeinoRustan Leino
60945
60945
add a comment |
add a comment |
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