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modify int_pow so that a power of -1 is valid (#548)

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This commit is contained in:
Mark Thom
2020-05-21 22:33:22 -06:00
parent fefd262c2e
commit 9e9c3b6342
1 changed files with 4 additions and 4 deletions
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8
src/prolog/machine/arithmetic_ops.rs
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@@ -398,7 +398,7 @@ impl MachineState {
match (n1, n2) {
(Number::Fixnum(n1), Number::Fixnum(n2)) => {
if n1 != 1 && n2 < 0 {
if n1 != 1 && n2 < -1 {
let n = Number::from(n1);
let stub = MachineError::functor_stub(clause_name!("^"), 2);
@@ -424,7 +424,7 @@ impl MachineState {
}
}
(Number::Fixnum(n1), Number::Integer(n2)) => {
if n1 != 1 && &*n2 < &0 {
if n1 != 1 && &*n2 < &-1 {
let n = Number::from(n1);
let stub = MachineError::functor_stub(clause_name!("^"), 2);
@@ -442,7 +442,7 @@ impl MachineState {
}
}
(Number::Integer(n1), Number::Fixnum(n2)) => {
if &*n1 != &1 && n2 < 0 {
if &*n1 != &1 && n2 < -1 {
let n = Number::Integer(n1);
let stub = MachineError::functor_stub(clause_name!("^"), 2);
@@ -460,7 +460,7 @@ impl MachineState {
}
}
(Number::Integer(n1), Number::Integer(n2)) => {
if &*n1 != &1 && &*n2 < &0 {
if &*n1 != &1 && &*n2 < &-1 {
let n = Number::Integer(n1);
let stub = MachineError::functor_stub(clause_name!("^"), 2);