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Print negative integer constants as (- n) in SMT-LIB2 #314

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Merged
coord-e merged 3 commits into from
Sep 30, 2026
Merged

Print negative integer constants as (- n) in SMT-LIB2 #314

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eb4da82
Print negative integer constants as (- n) in SMT-LIB2
claude Sep 30, 2026
e850d41
Trim IntConst doc comment
claude Sep 30, 2026
22d20bd
Merge origin/main into fix-negative-int-smtlib2
claude Sep 30, 2026
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17 changes: 15 additions & 2 deletions src/chc/smtlib2.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,19 @@ use rustc_index::IndexVec;

use crate::chc::{self, format_context::FormatContext};

/// An integer constant. SMT-LIB2 has no negative numerals.
struct IntConst<'a>(&'a num_bigint::BigInt);

impl std::fmt::Display for IntConst<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
if self.0.sign() == num_bigint::Sign::Minus {
write!(f, "(- {})", self.0.magnitude())
} else {
write!(f, "{}", self.0)
}
}
}

/// A helper struct to display a list of items.
#[derive(Debug, Clone)]
struct List<T> {
Expand Down Expand Up @@ -104,7 +117,7 @@ impl<'ctx, 'a> std::fmt::Display for Term<'ctx, 'a> {
match self.inner {
chc::Term::Null => write!(f, "null"),
chc::Term::Var(v) => write!(f, "{}", v),
chc::Term::Int(i) => write!(f, "{}", i),
chc::Term::Int(i) => write!(f, "{}", IntConst(i)),
chc::Term::Bool(b) => write!(f, "{}", b),
chc::Term::String(s) => write!(f, "\"{}\"", s.escape_default()),
chc::Term::Box(t) => {
Expand Down Expand Up @@ -615,7 +628,7 @@ impl<'ctx, 'a> std::fmt::Display for DatatypeDiscrFun<'ctx, 'a> {
format!(
"(ite ((_ is {ctor}) x) {discr} {acc})",
ctor = &ctor.symbol,
discr = ctor.discriminant,
discr = IntConst(&ctor.discriminant),
)
});
write!(
Expand Down
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