Comments (3)
Based on the stack trace, the crash happens during the encoding of specifications or pure functions. It is illegal to use quantifiers inside pure functions, so I suspect that the crash is caused by is_square
:
#[pure]
fn is_square(y: i32) -> bool {
exists(|z: i32| y == sqr(z), y) // Illegal syntax.
}
By the way:
- Existentials are typically hard for SMT solvers. Therefore, it is recommended to use a concrete witness instead.
x * x
is an example of non-linear integer arithmetic, which is undecidable.
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In addition to @vakaras comment, if you do want to wrap specification-only code into a "function", you can do so with a predicate. Predicates can only be called from specifications, such as pre- and postconditions, so your assert!
would also have to be changed to a prusti_assert!
.
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Thank you for your help, I'll have a look! Thx !
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Related Issues (20)
- Support for old(..) expressions in loop invariants
- Wrong encoding of signed discriminants in pure code HOT 1
- Unsupported constant string in println HOT 1
- Wrong encoding of signed divisions HOT 2
- Inconsistency in the encoding of Rust addresses as Viper Ref types
- ghost seq not implemented HOT 1
- Error for missing model lifetime specifier recommends invalid syntax, has unclear fix HOT 3
- Enum discriminant completeness
- Enum: unsupported statement kind `Intrinsic(Assume(move _))`
- External specification declared on a trait implementation did not resolve to a concrete type
- `len()` implementation without overflow errors HOT 1
- Error: cannot generate fold-unfold Viper statements
- Assert(false) passing with Shared References HOT 1
- unsupported feature: determining the region of a dereferentiation is not supported
- cannot generate fold-unfold Viper statements
- Internal error: Location bb6[1] has not yet been encoded
- Feature Request: Add Configuration Flag to Lower Verify Errors to Warnings HOT 1
- linux-aarch64: "cargo-prusti: cannot execute binary file: Exec format error"
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