3 files changed, 25 insertions, 1 deletions

diff --git a/src/grammar.ron b/src/grammar.ron
index f640ccb7b..9383abd19 100644
--- a/src/grammar.ron
+++ b/src/grammar.ron
@@ -126,6 +126,7 @@ Grammar(
         "TUPLE_EXPR",
         "PATH_EXPR",
         "CALL_EXPR",
+        "REF_EXPR",
 
         "EXTERN_BLOCK",
         "ENUM_VARIANT",
diff --git a/src/parser/grammar/expressions.rs b/src/parser/grammar/expressions.rs
index 7991b1921..4861536f8 100644
--- a/src/parser/grammar/expressions.rs
+++ b/src/parser/grammar/expressions.rs
@@ -26,7 +26,7 @@ pub(super) fn literal(p: &mut Parser) -> Option<CompletedMarker> {
 }
 
 pub(super) fn expr(p: &mut Parser) {
-    let mut lhs = atom_expr(p);
+    let mut lhs = prefix_expr(p);
 
     while let Some(m) = lhs {
         match p.current() {
@@ -36,6 +36,27 @@ pub(super) fn expr(p: &mut Parser) {
     }
 }
 
+fn prefix_expr(p: &mut Parser) -> Option<CompletedMarker> {
+    match p.current() {
+        AMPERSAND => Some(ref_expr(p)),
+        _ => atom_expr(p)
+    }
+}
+
+// test ref_expr
+// fn foo() {
+//     let _ = &1;
+//     let _ = &mut &f();
+// }
+fn ref_expr(p: &mut Parser) -> CompletedMarker {
+    assert!(p.at(AMPERSAND));
+    let m = p.start();
+    p.bump();
+    p.eat(MUT_KW);
+    expr(p);
+    m.complete(p, REF_EXPR)
+}
+
 fn atom_expr(p: &mut Parser) -> Option<CompletedMarker> {
     match literal(p) {
         Some(m) => return Some(m),
diff --git a/src/syntax_kinds/generated.rs b/src/syntax_kinds/generated.rs
index 986df7814..dc391c4a7 100644
--- a/src/syntax_kinds/generated.rs
+++ b/src/syntax_kinds/generated.rs
@@ -117,6 +117,7 @@ pub enum SyntaxKind {
     TUPLE_EXPR,
     PATH_EXPR,
     CALL_EXPR,
+    REF_EXPR,
     EXTERN_BLOCK,
     ENUM_VARIANT,
     NAMED_FIELD,
@@ -266,6 +267,7 @@ impl SyntaxKind {
             TUPLE_EXPR => &SyntaxInfo { name: "TUPLE_EXPR" },
             PATH_EXPR => &SyntaxInfo { name: "PATH_EXPR" },
             CALL_EXPR => &SyntaxInfo { name: "CALL_EXPR" },
+            REF_EXPR => &SyntaxInfo { name: "REF_EXPR" },
             EXTERN_BLOCK => &SyntaxInfo { name: "EXTERN_BLOCK" },
             ENUM_VARIANT => &SyntaxInfo { name: "ENUM_VARIANT" },
             NAMED_FIELD => &SyntaxInfo { name: "NAMED_FIELD" },