Added support for defining macros in Rust within the macro system

Also fixed a lot of bugs

orchid-extension/src/coroutine_exec.rs

@@ -35,15 +35,12 @@ impl BuilderCoroutine {
 		match cmd {
 			None => panic!("Before the stream ends, we should have gotten a Halt"),
 			Some(Command::Halt(expr)) => expr,
-			Some(Command::Execute(expr, reply)) => call([
-				lambda(0, [seq([
-					arg(0),
-					call([Replier { reply, builder: self }.to_expr().await, arg(0)]),
-				])]),
-				expr,
-			]),
+			Some(Command::Execute(expr, reply)) => call(
+				lambda(0, seq([arg(0)], call(Replier { reply, builder: self }.to_expr().await, [arg(0)]))),
+				[expr],
+			),
 			Some(Command::Register(expr, reply)) =>
-				call([Replier { reply, builder: self }.to_expr().await, expr]),
+				call(Replier { reply, builder: self }.to_expr().await, [expr]),
 		}
 	}
 }