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-rw-r--r--src/unify.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/unify.cpp b/src/unify.cpp
index 9bb2f3c..a23bbcb 100644
--- a/src/unify.cpp
+++ b/src/unify.cpp
@@ -68,7 +68,7 @@ substitute(const AST* in, const AST* from, const AST* to)
const ATuple* tup = in->to_tuple();
if (!tup || !tup->fst())
return from;
-
+
List ret;
for (const auto& i : *tup->as_tuple()) {
if (!i) {