fix Default impl for RecordFunc

Deriving it puts the Default trait bound on X, T and D, even though this
is not necessary.

1 files changed, 7 insertions, 1 deletions

diff --git a/src/statistics/math.rs b/src/statistics/math.rs
index 6e7e666..f0b0384 100644
--- a/src/statistics/math.rs
+++ b/src/statistics/math.rs
@@ -45,7 +45,7 @@ struct Record<X, T, D> {
 /// * `T` tag for each data point. Can be arbitrary.
 /// * `D` actual data. Must be [`Monoid`](trait.Monoid.html), so that it can be
 ///   summed up.
-#[derive(Clone, Default)]
+#[derive(Clone)]
 pub struct RecordFunc<X, T, D> {
     data: Vec<Record<X, T, D>>,
 }
@@ -138,6 +138,12 @@ where
     }
 }
 
+impl<X: Ord, T, D: Monoid> Default for RecordFunc<X, T, D> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;