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parse negative numbers properly, handle length errors and failures properly.

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This commit is contained in:
Mark Thom
2018-05-12 18:23:57 -06:00
parent 5690409534
commit b0bdf50a78
5 changed files with 51 additions and 21 deletions
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4
src/prolog/machine/system_calls.rs
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@@ -103,10 +103,10 @@ impl MachineState {
}
pub(super) fn skip_max_list(&mut self) -> Result<(), MachineError> {
let max_steps = self.arith_eval_by_metacall(temp_v!(2))?;
let max_steps = self.store(self.deref(self[temp_v!(2)].clone()));
match max_steps {
Number::Integer(ref max_steps)
Addr::Con(Constant::Number(Number::Integer(ref max_steps)))
if max_steps.to_isize().map(|i| i >= -1).unwrap_or(false) => {
let n = self.store(self.deref(self[temp_v!(1)].clone()));