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-rw-r--r--src/libstd/rt/io/extensions.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libstd/rt/io/extensions.rs b/src/libstd/rt/io/extensions.rs
index 727ab13a4f6..a5e68bcdac4 100644
--- a/src/libstd/rt/io/extensions.rs
+++ b/src/libstd/rt/io/extensions.rs
@@ -297,7 +297,8 @@ impl<T: Reader> ReaderUtil for T {
 
             do (|| {
                 while total_read < len {
-                    let slice = vec::mut_slice(*buf, start_len + total_read, buf.len());
+                    let len = buf.len();
+                    let slice = vec::mut_slice(*buf, start_len + total_read, len);
                     match self.read(slice) {
                         Some(nread) => {
                             total_read += nread;