Letta MCP Server

macro_rules! if_downcast_into { ($in_ty:ty, $out_ty:ty, $val:ident, $body:expr) => {{ if std::any::TypeId::of::<$in_ty>() == std::any::TypeId::of::<$out_ty>() { // Store the value in an `Option` so we can `take` // it after casting to `&mut dyn Any`. let mut slot = Some($val); // Re-write the `$val` ident with the downcasted value. let $val = (&mut slot as &mut dyn std::any::Any) .downcast_mut::<Option<$out_ty>>() .unwrap() .take() .unwrap(); // Run the $body in scope of the replaced val. $body } }}; }