message: Fix a nonsense message in reactor macro's `!` routing
diff: @@ -234,7 +234,7 @@ pub(crate) fn generate_reactor_impl(def: &ReactorDefinition) -> TokenStream {
  dispatches.push(quote!(
  #event_ident::#request_variant_ident(request) => {
  // Request is discarded.
  - panic!("received request that was expressively marked panic: {:?}", request)
  + panic!("received event that was explicitly route to a panic: {:?}", request)
  },
  ));
  }
  