fix(input): InputMap manual Default impl

input/src/input_dsl.rs

@@ -4,12 +4,17 @@ use crate::*;
 /// Each contained layer defines a mapping from input event to command invocation
 /// over a given state. Furthermore, each layer may have an associated cond,
 /// so that only certain layers are active at a given time depending on state.
-#[derive(Debug, Default)] pub struct InputMap<I, T: Dsl>(
+#[derive(Debug)] pub struct InputMap<I, T: Dsl>(
     /// Map of input event (key combination) to
     /// all command expressions bound to it by
     /// all loaded input layers.
     pub BTreeMap<I, Vec<InputBinding<T>>>
 );
+impl<I, T: Dsl> Default for InputMap<I, T> {
+    fn default () -> Self {
+        Self(Default::default())
+    }
+}
 #[derive(Debug, Default)] pub struct InputBinding<T: Dsl> {
     condition:   Option<T>,
     command:     T,