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correct new copier bug

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This commit is contained in:
Mark Thom
2018-09-16 10:57:14 -06:00
parent 70939331d1
commit 908b0a5712
2 changed files with 5 additions and 4 deletions
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3
src/prolog/copier.rs
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@@ -84,7 +84,6 @@ pub(crate) trait CopierTarget
match rd.clone() {
Addr::HeapCell(hc) if hc >= old_h => {
self[threshold] = HeapCellValue::Addr(rd);
scan += 1;
},
addr @ Addr::HeapCell(..) | addr @ Addr::StackCell(..) => {
if rd == addr {
@@ -92,8 +91,6 @@ pub(crate) trait CopierTarget
} else {
self[threshold] = HeapCellValue::Addr(addr);
}
scan += 1;
},
_ => {
trail.push((Ref::HeapCell(a), self[a].clone()));

6
src/tests.rs
View File

@@ -1484,7 +1484,11 @@ fn test_queries_on_builtins()
assert_prolog_failure!(&mut wam, "?- duplicate_term(g(X), f(X)).");
assert_prolog_success!(&mut wam, "?- duplicate_term(f(X), f(X)).",
[["X = _1"]]);
assert_prolog_success!(&mut wam, "?- duplicate_term([[[[X, Y], Y], X]], Term).",
[["Term = [[[[_22, _26], _26], _22]]", "X = _2", "Y = _0"]]);
assert_prolog_success!(&mut wam, "?- duplicate_term([X, [Y, [X]]], Term).",
[["Term = [_12, [_16, [_12]]]", "X = _0", "Y = _4"]]);
// test duplicate_term on cyclic terms.
assert_prolog_failure!(&mut wam, "?- X = g(X, Y), Y = f(X), duplicate_term(Y, g(Z)).");
assert_prolog_success!(&mut wam, "?- X = g(X, Y), Y = f(X), duplicate_term(Y, f(Z)).",