2 files changed, 9 insertions, 9 deletions
diff --git a/dhall/src/semantics/tck/env.rs b/dhall/src/semantics/tck/env.rs
index ba7fb73..7990059 100644
--- a/dhall/src/semantics/tck/env.rs
+++ b/dhall/src/semantics/tck/env.rs
@@ -1,4 +1,4 @@
-use crate::semantics::{AlphaVar, NzEnv, NzVar, Type, Value};
+use crate::semantics::{AlphaVar, NzEnv, NzVar, Type, ValEnv, Value};
 use crate::syntax::{Label, V};
 
 /// Environment for indexing variables.
@@ -17,7 +17,7 @@ pub(crate) struct NameEnv {
 #[derive(Debug, Clone)]
 pub(crate) struct TyEnv {
     names: NameEnv,
-    items: NzEnv,
+    items: ValEnv<Type>,
 }
 
 impl VarEnv {
@@ -91,14 +91,14 @@ impl TyEnv {
     pub fn new() -> Self {
         TyEnv {
             names: NameEnv::new(),
-            items: NzEnv::new(),
+            items: ValEnv::new(),
         }
     }
     pub fn as_varenv(&self) -> VarEnv {
         self.names.as_varenv()
     }
-    pub fn as_nzenv(&self) -> &NzEnv {
-        &self.items
+    pub fn to_nzenv(&self) -> NzEnv {
+        self.items.discard_types()
     }
     pub fn as_nameenv(&self) -> &NameEnv {
         &self.names
@@ -121,8 +121,8 @@ impl TyEnv {
     }
 }
 
-impl<'a> From<&'a TyEnv> for &'a NzEnv {
+impl<'a> From<&'a TyEnv> for NzEnv {
     fn from(x: &'a TyEnv) -> Self {
-        x.as_nzenv()
+        x.to_nzenv()
     }
 }
diff --git a/dhall/src/semantics/tck/tyexpr.rs b/dhall/src/semantics/tck/tyexpr.rs
index edba477..a1666a4 100644
--- a/dhall/src/semantics/tck/tyexpr.rs
+++ b/dhall/src/semantics/tck/tyexpr.rs
@@ -56,13 +56,13 @@ impl TyExpr {
     }
 
     /// Eval the TyExpr. It will actually get evaluated only as needed on demand.
-    pub fn eval<'e>(&self, env: impl Into<&'e NzEnv>) -> Value {
+    pub fn eval(&self, env: impl Into<NzEnv>) -> Value {
         Value::new_thunk(env.into(), self.to_hir())
     }
     /// Eval a closed TyExpr (i.e. without free variables). It will actually get evaluated only as
     /// needed on demand.
     pub fn eval_closed_expr(&self) -> Value {
-        self.eval(&NzEnv::new())
+        self.eval(NzEnv::new())
     }
     /// Eval a closed TyExpr fully and recursively;
     pub fn rec_eval_closed_expr(&self) -> Value {