ExprF need not be generic in Label

4 files changed, 9 insertions, 15 deletions

diff --git a/dhall/src/core/thunk.rs b/dhall/src/core/thunk.rs
index 51922e1..eed8685 100644
--- a/dhall/src/core/thunk.rs
+++ b/dhall/src/core/thunk.rs
@@ -1,7 +1,7 @@
 use std::cell::{Ref, RefCell};
 use std::rc::Rc;
 
-use dhall_syntax::{ExprF, Label, X};
+use dhall_syntax::{ExprF, X};
 
 use crate::core::context::NormalizationContext;
 use crate::core::context::TypecheckContext;
@@ -30,7 +30,7 @@ enum ThunkInternal {
     /// Partially normalized value whose subexpressions have been thunked (this is returned from
     /// typechecking). Note that this is different from `Value::PartialExpr` because there is no
     /// requirement of WHNF here.
-    PartialExpr(ExprF<Thunk, Label, X>),
+    PartialExpr(ExprF<Thunk, X>),
     /// Partially normalized value.
     /// Invariant: if the marker is `NF`, the value must be fully normalized
     Value(Marker, Value),
@@ -121,7 +121,7 @@ impl Thunk {
         Thunk::new(NormalizationContext::new(), e.absurd())
     }
 
-    pub(crate) fn from_partial_expr(e: ExprF<Thunk, Label, X>) -> Thunk {
+    pub(crate) fn from_partial_expr(e: ExprF<Thunk, X>) -> Thunk {
         ThunkInternal::PartialExpr(e).into_thunk()
     }
 
@@ -280,7 +280,6 @@ impl Shift for ThunkInternal {
                     |v| Ok(v.shift(delta, var)?),
                     |x, v| Ok(v.shift(delta, &var.under_binder(x))?),
                     |x| Ok(X::clone(x)),
-                    |l| Ok(Label::clone(l)),
                 )?,
             ),
             ThunkInternal::Value(m, v) => {
@@ -322,7 +321,6 @@ impl Subst<Typed> for ThunkInternal {
                         )
                     },
                     X::clone,
-                    Label::clone,
                 ),
             ),
             ThunkInternal::Value(_, v) => {
diff --git a/dhall/src/core/value.rs b/dhall/src/core/value.rs
index e91b6bc..799cfac 100644
--- a/dhall/src/core/value.rs
+++ b/dhall/src/core/value.rs
@@ -58,7 +58,7 @@ pub(crate) enum Value {
     // contiguous text values must be merged.
     TextLit(Vec<InterpolatedTextContents<Thunk>>),
     // Invariant: this must not contain a value captured by one of the variants above.
-    PartialExpr(ExprF<Thunk, Label, X>),
+    PartialExpr(ExprF<Thunk, X>),
 }
 
 impl Value {
@@ -433,7 +433,6 @@ impl Shift for Value {
                     |v| Ok(v.shift(delta, var)?),
                     |x, v| Ok(v.shift(delta, &var.under_binder(x))?),
                     |x| Ok(X::clone(x)),
-                    |l| Ok(Label::clone(l)),
                 )?,
             ),
         })
@@ -459,7 +458,6 @@ impl Subst<Typed> for Value {
                         )
                     },
                     X::clone,
-                    Label::clone,
                 ))
             }
             // Retry normalizing since substituting may allow progress
diff --git a/dhall/src/phase/normalize.rs b/dhall/src/phase/normalize.rs
index 52c1666..64de2a7 100644
--- a/dhall/src/phase/normalize.rs
+++ b/dhall/src/phase/normalize.rs
@@ -1,7 +1,7 @@
 use std::collections::HashMap;
 
 use dhall_syntax::{
-    BinOp, Builtin, ExprF, InterpolatedText, InterpolatedTextContents, Label,
+    BinOp, Builtin, ExprF, InterpolatedText, InterpolatedTextContents,
     NaiveDouble, X,
 };
 
@@ -356,12 +356,11 @@ pub(crate) fn normalize_whnf(
     }
 
     // Thunk subexpressions
-    let expr: ExprF<Thunk, Label, X> =
+    let expr: ExprF<Thunk, X> =
         expr.as_ref().map_ref_with_special_handling_of_binders(
             |e| Thunk::new(ctx.clone(), e.clone()),
             |x, e| Thunk::new(ctx.skip(x), e.clone()),
             |_| unreachable!(),
-            Label::clone,
         );
 
     normalize_one_layer(expr)
@@ -372,7 +371,7 @@ enum Ret<'a> {
     RetValue(Value),
     RetThunk(Thunk),
     RetThunkRef(&'a Thunk),
-    RetExpr(ExprF<Thunk, Label, X>),
+    RetExpr(ExprF<Thunk, X>),
 }
 
 fn merge_maps<K, V>(
@@ -521,7 +520,7 @@ fn apply_binop<'a>(o: BinOp, x: &'a Thunk, y: &'a Thunk) -> Option<Ret<'a>> {
     })
 }
 
-pub(crate) fn normalize_one_layer(expr: ExprF<Thunk, Label, X>) -> Value {
+pub(crate) fn normalize_one_layer(expr: ExprF<Thunk, X>) -> Value {
     use Ret::{RetExpr, RetThunk, RetThunkRef, RetValue};
     use Value::{
         BoolLit, DoubleLit, EmptyListLit, EmptyOptionalLit, IntegerLit, Lam,
diff --git a/dhall/src/phase/typecheck.rs b/dhall/src/phase/typecheck.rs
index 497a703..2dc97bb 100644
--- a/dhall/src/phase/typecheck.rs
+++ b/dhall/src/phase/typecheck.rs
@@ -421,7 +421,6 @@ fn type_with(
                     |e| type_with(ctx, e.clone()),
                     |_, _| unreachable!(),
                     |_| unreachable!(),
-                    |l| Ok(Label::clone(l)),
                 )?;
             let ret = type_last_layer(ctx, &expr)?;
             let ret = match ret {
@@ -449,7 +448,7 @@ fn type_with(
 /// layer.
 fn type_last_layer(
     ctx: &TypecheckContext,
-    e: &ExprF<Typed, Label, X>,
+    e: &ExprF<Typed, X>,
 ) -> Result<Ret, TypeError> {
     use crate::error::TypeMessage::*;
     use dhall_syntax::BinOp::*;