Add HIR Expr machinery

crates/ra_syntax/src/ast/generated.rs

@@ -378,7 +378,11 @@ impl<R: TreeRoot<RaTypes>> BreakExprNode<R> {
 }
 
 
-impl<'a> BreakExpr<'a> {}
+impl<'a> BreakExpr<'a> {
+    pub fn expr(self) -> Option<Expr<'a>> {
+        super::child_opt(self)
+    }
+}
 
 // Byte
 #[derive(Debug, Clone, Copy,)]
@@ -3880,6 +3884,10 @@ impl<'a> StructLit<'a> {
     pub fn named_field_list(self) -> Option<NamedFieldList<'a>> {
         super::child_opt(self)
     }
+
+    pub fn spread(self) -> Option<Expr<'a>> {
+        super::child_opt(self)
+    }
 }
 
 // StructPat

crates/ra_syntax/src/grammar.ron

@@ -384,7 +384,7 @@ Grammar(
             options: [ "Condition" ]
         ),
         "ContinueExpr": (),
-        "BreakExpr": (),
+        "BreakExpr": (options: ["Expr"]),
         "Label": (),
         "BlockExpr": (
             options: [ "Block" ]
@@ -404,7 +404,7 @@ Grammar(
             collections: [ [ "pats", "Pat" ] ]
         ),
         "MatchGuard": (),
-        "StructLit": (options: ["Path", "NamedFieldList"]),
+        "StructLit": (options: ["Path", "NamedFieldList", ["spread", "Expr"]]),
         "NamedFieldList": (collections: [ ["fields", "NamedField"] ]),
         "NamedField": (options: ["NameRef", "Expr"]),
         "CallExpr": (