diff --git a/src/testing.rs b/src/testing.rs
index d2d404c..363d54e 100644
--- a/src/testing.rs
+++ b/src/testing.rs
@@ -5,7 +5,7 @@ use std::{error::Error, fmt::Display, rc::Rc};
 
 use sha2::{Digest, Sha256};
 
-use crate::func::{context::FunctorContext, *};
+use crate::func::{context::*, *};
 use crate::rcore::*;
 use crate::rstd::{cast::*, inject::*, typeless::*};
 
@@ -68,6 +68,10 @@ impl<'a> FunctorContext<'a> for TestContextPlain {
     type T = instances::solo::SoloInstance;
 }
 
+impl<'a> FallibleCtx<'a> for TestContextPlain {
+    type Fallible = instances::result::ResultFailAny;
+}
+
 impl<'a> Context<'a> for TestContextPlain {
     type _Tm = Self::T;