From 071ba528cd8c6a222be345ddec7560bb45cca6be Mon Sep 17 00:00:00 2001
From: Nadrieril
Date: Thu, 8 Aug 2019 19:33:07 +0200
Subject: Add support for dependent types

---
 dhall_syntax/src/parser.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'dhall_syntax/src/parser.rs')

diff --git a/dhall_syntax/src/parser.rs b/dhall_syntax/src/parser.rs
index 72dfcdd..9ae6dc8 100644
--- a/dhall_syntax/src/parser.rs
+++ b/dhall_syntax/src/parser.rs
@@ -311,6 +311,7 @@ fn can_be_shortcutted(rule: Rule) -> bool {
         | times_expression
         | equal_expression
         | not_equal_expression
+        | equivalent_expression
         | application_expression
         | first_application_expression
         | selector_expression
@@ -744,6 +745,7 @@ make_parser! {
     token_rule!(forall<()>);
     token_rule!(arrow<()>);
     token_rule!(merge<()>);
+    token_rule!(assert<()>);
     token_rule!(if_<()>);
     token_rule!(in_<()>);
 
@@ -777,6 +779,9 @@ make_parser! {
         [merge(()), expression(x), expression(y), expression(z)] => {
             spanned(span, Merge(x, y, Some(z)))
         },
+        [assert(()), expression(x)] => {
+            spanned(span, Assert(x))
+        },
         [expression(e)] => e,
     ));
 
@@ -875,6 +880,13 @@ make_parser! {
             rest.fold(first, |acc, e| unspanned(BinOp(o, acc, e)))
         },
     ));
+    rule!(equivalent_expression<ParsedSubExpr> as expression; children!(
+        [expression(e)] => e,
+        [expression(first), expression(rest)..] => {
+            let o = crate::BinOp::Equivalence;
+            rest.fold(first, |acc, e| unspanned(BinOp(o, acc, e)))
+        },
+    ));
 
     rule!(annotated_expression<ParsedSubExpr> as expression; span; children!(
         [expression(e)] => e,
-- 
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