fix issue with same names causing 0 index debruijn for var

crates/uplc/src/debruijn.rs

@@ -59,6 +59,8 @@ impl Converter {
 
                 self.end_scope();
 
+                self.remove_unique(parameter_name.unique);
+
                 Term::Lambda {
                     parameter_name: name,
                     body: Box::new(body),
@@ -95,6 +97,8 @@ impl Converter {
 
                 self.end_scope();
 
+                self.remove_unique(parameter_name.unique);
+
                 Term::Lambda {
                     parameter_name: name,
                     body: Box::new(body),
@@ -340,6 +344,12 @@ impl Converter {
         scope.insert(unique, self.current_level);
     }
 
+    fn remove_unique(&mut self, unique: Unique) {
+        let scope = &mut self.levels[self.current_level.0];
+
+        scope.remove(unique, self.current_level);
+    }
+
     fn declare_binder(&mut self) {
         let scope = &mut self.levels[self.current_level.0];
 

crates/uplc/src/debruijn/bimap.rs

@@ -4,6 +4,8 @@ use crate::ast::Unique;
 
 use super::Level;
 
+#[derive(Debug)]
+
 pub struct BiMap {
     left: HashMap<Unique, Level>,
     right: HashMap<Level, Unique>,
@@ -22,6 +24,11 @@ impl BiMap {
         self.right.insert(level, unique);
     }
 
+    pub(super) fn remove(&mut self, unique: Unique, level: Level) {
+        self.left.remove(&unique);
+        self.right.remove(&level);
+    }
+
     pub(super) fn get(&self, unique: &Unique) -> Option<&Level> {
         self.left.get(unique)
     }