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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 d5d7a0233999..8336a48f42fc 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -205,7 +205,7 @@ struct ExprLambda : Expr
                 % arg % pos);
     };
     void setName(Symbol & name);
-    string showNamePos();
+    string showNamePos() const;
     COMMON_METHODS
 };