Add proc_macro the generated dhall expressions

3 files changed, 7 insertions, 5 deletions

diff --git a/dhall_normalize/Cargo.toml b/dhall_normalize/Cargo.toml
index 3affee8..ad1cc0d 100644
--- a/dhall_normalize/Cargo.toml
+++ b/dhall_normalize/Cargo.toml
@@ -15,3 +15,4 @@ nom = "3.0.0"
 term-painter = "0.2.3"
 pest = { git = "https://github.com/pest-parser/pest" }
 dhall_core = { path = "../dhall_core" }
+dhall_generator = { path = "../dhall_generator" }
diff --git a/dhall_normalize/src/lib.rs b/dhall_normalize/src/lib.rs
index a2f7041..df49146 100644
--- a/dhall_normalize/src/lib.rs
+++ b/dhall_normalize/src/lib.rs
@@ -1,5 +1,6 @@
 #![feature(box_patterns)]
 #![feature(trace_macros)]
+#![feature(proc_macro_hygiene)]
 
 mod normalize;
 pub use crate::normalize::*;
diff --git a/dhall_normalize/src/normalize.rs b/dhall_normalize/src/normalize.rs
index 1fa5524..3b87419 100644
--- a/dhall_normalize/src/normalize.rs
+++ b/dhall_normalize/src/normalize.rs
@@ -1,6 +1,7 @@
 #![allow(non_snake_case)]
 use std::fmt;
 use dhall_core::core::*;
+use dhall_generator::dhall;
 
 /// Reduce an expression to its normal form, performing beta reduction
 ///
@@ -158,11 +159,10 @@ where
                     normalize(&b)
                 }
                 (App(box Builtin(OptionalBuild), a0), g) => {
-                    let e2: Expr<_, _> = app(app(app(g,
-                        App(bx(Builtin(Optional)), a0.clone())),
-                            Lam("x", a0.clone(),
-                                bx(OptionalLit(Some(a0.clone()), vec![Var(V("x", 0))])))),
-                            OptionalLit(Some(a0), vec![]));
+                    let x = bx(Var(V("x", 0)));
+                    let g = bx(g);
+                    let e2: Expr<_, _> =
+                        dhall!((g (Optional a0)) (λ(x: a0) -> [x] :  Optional a0) ([] :  Optional a0));
                     normalize(&e2)
                 }
                 (f2, a2) => app(f2, a2),