Code gen now handles expecting on validator args in the air stack.

Thus allowing us to use code gen created functions to expect on data types including recursive ones.
Some minor tweaks to the air.
Added a uplc optimization for later.

crates/aiken-lang/src/gen_uplc/air.rs

@@ -3,7 +3,7 @@ use std::sync::Arc;
 use uplc::builtins::DefaultFunction;
 
 use crate::{
-    ast::{Arg, BinOp, UnOp},
+    ast::{BinOp, UnOp},
     tipo::{Type, ValueConstructor},
 };
 
@@ -213,9 +213,8 @@ pub enum Air {
         scope: Scope,
         tipo: Arc<Type>,
     },
-    Validator {
+    NoOp {
         scope: Scope,
-        params: Vec<Arg<Arc<Type>>>,
     },
     FieldsEmpty {
         scope: Scope,
@@ -264,7 +263,7 @@ impl Air {
             | Air::TupleIndex { scope, .. }
             | Air::ErrorTerm { scope, .. }
             | Air::Trace { scope, .. }
-            | Air::Validator { scope, .. } => scope.clone(),
+            | Air::NoOp { scope, .. } => scope.clone(),
         }
     }
     pub fn scope_mut(&mut self) -> &mut Scope {
@@ -308,7 +307,7 @@ impl Air {
             | Air::TupleIndex { scope, .. }
             | Air::ErrorTerm { scope, .. }
             | Air::Trace { scope, .. }
-            | Air::Validator { scope, .. } => scope,
+            | Air::NoOp { scope, .. } => scope,
         }
     }
     pub fn tipo(&self) -> Option<Arc<Type>> {
@@ -399,7 +398,7 @@ impl Air {
             | Air::Finally { .. }
             | Air::FieldsExpose { .. }
             | Air::FieldsEmpty { .. }
-            | Air::Validator { .. } => None,
+            | Air::NoOp { .. } => None,
             Air::UnOp { op, .. } => match op {
                 UnOp::Not => Some(
                     Type::App {