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-rw-r--r--src/libexpr/nixexpr.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/nixexpr.cc b/src/libexpr/nixexpr.cc
index 2e26d50817fb..d52f7eadbbe3 100644
--- a/src/libexpr/nixexpr.cc
+++ b/src/libexpr/nixexpr.cc
@@ -330,7 +330,7 @@ void ExprLambda::setName(Symbol & name)
 }
 
 
-string ExprLambda::showNamePos()
+string ExprLambda::showNamePos() const
 {
     return (format("%1% at %2%") % (name.set() ? "`" + (string) name + "'" : "an anonymous function") % pos).str();
 }