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-rw-r--r--src/libexpr/nixexpr.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index 6e67e5ebd1cd..3fd22ecfed57 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -92,5 +92,7 @@ Expr makeBool(bool b);
 
 string showType(Expr e);
 
+string showValue(Expr e);
+
 
 #endif /* !__NIXEXPR_H */