diff --git a/src/main.rs b/src/main.rs
index 6f3a637..e973561 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -37,8 +37,8 @@ impl Value {
 #[derive(Clone, Copy, Debug)]
 struct Object { index: u32 }  
 struct Program { 
-    blocks: Interner<BlockData>,
-    types: Interner<TypeData>,
+    blocks: Prototyper<BlockData>,
+    types: Prototyper<TypeData>,
 }
 struct BlockData { instructions: Vec<Instruction> }
 
@@ -312,8 +312,8 @@ impl Op21 {
 impl Program {
     fn new() -> Program {
         let mut p = Self {
-            blocks: Interner::<BlockData>::new(),
-            types: Interner::<TypeData>::new(),
+            blocks: Prototyper::<BlockData>::new(),
+            types: Prototyper::<TypeData>::new(),
         };
 
         let ty_null = p.type_prototype("null");
@@ -431,13 +431,13 @@ impl<'p> Heap<'p> {
     }
 }
 
-struct Interner<T> {
+struct Prototyper<T> {
     by_name: HashMap<String, u32>,
     names: Vec<String>,
     values: Vec<Option<T>>
 }
 
-impl<T> Interner<T> {
+impl<T> Prototyper<T> {
     pub fn new() -> Self {
         Self {
             by_name: HashMap::new(),
@@ -459,7 +459,7 @@ impl<T> Interner<T> {
     pub fn instantiate(&mut self, handle: u32, value: T) -> Result<(), &'static str> {
         let slot = self.values
             .get_mut(handle as usize)
-            .ok_or("handle was not prototyped on this interner")?;
+            .ok_or("handle was not prototyped on this prototyper")?;
         if slot.is_some() {
             return Err("can't instantiate handle twice")
         }
@@ -471,7 +471,7 @@ impl<T> Interner<T> {
         match self.values.get(handle as usize) {
             Some(Some(h)) => Ok(h),
             Some(_) => Err("handle was prototyped but not instantiated"),
-            _ => Err("handle was not prototyped on this interner"),
+            _ => Err("handle was not prototyped on this prototyper"),
         }
     }
 
@@ -479,7 +479,7 @@ impl<T> Interner<T> {
         match self.values.get_mut(handle as usize) {
             Some(Some(h)) => Ok(h),
             Some(_) => Err("handle was prototyped but not instantiated"),
-            _ => Err("handle was not prototyped on this interner"),
+            _ => Err("handle was not prototyped on this prototyper"),
         }
     }
 }