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retain the string "[]" as is, instead of converting it to '[]' (i.e., "") #1222

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merged 1 commit into from
Jan 16, 2022
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retain the string "[]" as is, instead of converting it to '[]' (i.e., "") #1222

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10 changes: 8 additions & 2 deletions src/machine/system_calls.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -735,8 +735,14 @@ impl MachineState {
pub fn value_to_str_like(&mut self, value: HeapCellValue) -> Option<AtomOrString> {
read_heap_cell!(value,
(HeapCellValueTag::CStr, cstr_atom) => {
// avoid allocating a String if possible ...
Some(AtomOrString::Atom(cstr_atom))
// avoid allocating a String if possible:
// We must be careful to preserve the string "[]" as is,
// instead of turning it into the atom [], i.e., "".
if cstr_atom == atom!("[]") {
Some(AtomOrString::String("[]".to_string()))
} else {
Some(AtomOrString::Atom(cstr_atom))
}
}
(HeapCellValueTag::Atom, (atom, arity)) => {
if arity == 0 {
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