[core] add comment explaining Decode requirement

use-ink · Jul 30, 2019 · 89d0e88 · 89d0e88
1 parent 219c851
commit 89d0e88
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/core/src/env/traits.rs b/core/src/env/traits.rs
@@ -51,7 +51,8 @@ pub trait EnvTypes {
     type Moment: Codec + Clone + PartialEq + Eq + core::fmt::Debug;
     /// The type of block number.
     type BlockNumber: Codec + Clone + PartialEq + Eq + core::fmt::Debug;
-    /// The type of a call into the runtime
+    /// The type of a call into the runtime.
+    /// Requires Decode for inspecting raw dispatched calls in the test environment.
     type Call: Codec + Clone + PartialEq + Eq + core::fmt::Debug;
 }