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-rw-r--r--src/libserialize/json.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libserialize/json.rs b/src/libserialize/json.rs
index 529ed8598b1..096c72e6af2 100644
--- a/src/libserialize/json.rs
+++ b/src/libserialize/json.rs
@@ -2622,6 +2622,7 @@ mod tests {
     use std::{i64, u64, f32, f64};
     use std::collections::BTreeMap;
     use std::string;
+    use std::old_io::Writer;
 
     #[derive(RustcDecodable, Eq, PartialEq, Debug)]
     struct OptionData {