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-rw-r--r--054dilated_reagent.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/054dilated_reagent.cc b/054dilated_reagent.cc
index c20de79a..0487fe2b 100644
--- a/054dilated_reagent.cc
+++ b/054dilated_reagent.cc
@@ -72,6 +72,7 @@ string slurp_balanced_bracket(istream& in) {
 
 :(after "Parsing reagent(string s)")
 if (s.at(0) == '{') {
+  assert(properties.empty());
   istringstream in(s);
   in >> std::noskipws;
   in.get();  // skip '{'