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-rw-r--r--src/libexpr/nixexpr.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index 9c631d093bf0..2619a7026fca 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -224,7 +224,7 @@ struct ExprLambda : Expr
         : pos(pos), arg(arg), matchAttrs(matchAttrs), formals(formals), body(body)
     {
         if (!arg.empty() && formals && formals->argNames.find(arg) != formals->argNames.end())
-            throw ParseError(format("duplicate formal function argument `%1%' at %2%")
+            throw ParseError(format("duplicate formal function argument ‘%1%’ at %2%")
                 % arg % pos);
     };
     void setName(Symbol & name);