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-rw-r--r--031merge.cc4
1 files changed, 2 insertions, 2 deletions
diff --git a/031merge.cc b/031merge.cc
index dea86982..4acc6ec8 100644
--- a/031merge.cc
+++ b/031merge.cc
@@ -184,8 +184,8 @@ void check_merge_call(const vector<reagent>& ingredients, const reagent& product
       default: {
         if (!types_coercible(container, ingredients.at(ingredient_index))) {
           raise << maybe(caller.name) << "incorrect type of ingredient " << ingredient_index << " in '" << to_original_string(inst) << "'\n" << end();
-          raise << "  (expected " << debug_string(container) << ")\n" << end();
-          raise << "  (got " << debug_string(ingredients.at(ingredient_index)) << ")\n" << end();
+          raise << "  (expected '" << debug_string(container) << "')\n" << end();
+          raise << "  (got '" << debug_string(ingredients.at(ingredient_index)) << "')\n" << end();
           return;
         }
         ++ingredient_index;