Add error type aliases to ProgramCollect trait

2 files changed, 4 insertions, 0 deletions

diff --git a/mingling_core/src/program.rs b/mingling_core/src/program.rs
index febb5db..c7544f5 100644
--- a/mingling_core/src/program.rs
+++ b/mingling_core/src/program.rs
@@ -294,6 +294,8 @@ where
 pub trait ProgramCollect {
     /// Enum type representing internal IDs for the program
     type Enum: Display;
+    type DispatcherNotFound: Groupped<Self::Enum>;
+    type RendererNotFound: Groupped<Self::Enum>;
 
     /// Use a prefix tree to quickly match arguments and dispatch to an Entry
     #[cfg(feature = "dispatch_tree")]
diff --git a/mingling_macros/src/lib.rs b/mingling_macros/src/lib.rs
index 2624f60..23f9ad9 100644
--- a/mingling_macros/src/lib.rs
+++ b/mingling_macros/src/lib.rs
@@ -1243,6 +1243,8 @@ pub fn program_final_gen(input: TokenStream) -> TokenStream {
 
         impl ::mingling::ProgramCollect for #name {
             type Enum = #name;
+            type DispatcherNotFound = DispatcherNotFound;
+            type RendererNotFound = RendererNotFound;
             fn build_renderer_not_found(member_id: Self::Enum) -> ::mingling::AnyOutput<Self::Enum> {
                 ::mingling::AnyOutput::new(RendererNotFound::new(member_id.to_string()))
             }