Add beginnings of type infrastructure

crates/ra_syntax/src/ast/generated.rs

@@ -523,7 +523,15 @@ impl<R: TreeRoot<RaTypes>> CastExprNode<R> {
 }
 
 
-impl<'a> CastExpr<'a> {}
+impl<'a> CastExpr<'a> {
+    pub fn expr(self) -> Option<Expr<'a>> {
+        super::child_opt(self)
+    }
+
+    pub fn type_ref(self) -> Option<TypeRef<'a>> {
+        super::child_opt(self)
+    }
+}
 
 // Char
 #[derive(Debug, Clone, Copy,)]
@@ -2312,6 +2320,10 @@ impl<'a> Param<'a> {
     pub fn pat(self) -> Option<Pat<'a>> {
         super::child_opt(self)
     }
+
+    pub fn type_ref(self) -> Option<TypeRef<'a>> {
+        super::child_opt(self)
+    }
 }
 
 // ParamList
@@ -2394,7 +2406,11 @@ impl<R: TreeRoot<RaTypes>> ParenExprNode<R> {
 }
 
 
-impl<'a> ParenExpr<'a> {}
+impl<'a> ParenExpr<'a> {
+    pub fn expr(self) -> Option<Expr<'a>> {
+        super::child_opt(self)
+    }
+}
 
 // ParenType
 #[derive(Debug, Clone, Copy,)]
@@ -2829,7 +2845,11 @@ impl<R: TreeRoot<RaTypes>> PrefixExprNode<R> {
 }
 
 
-impl<'a> PrefixExpr<'a> {}
+impl<'a> PrefixExpr<'a> {
+    pub fn expr(self) -> Option<Expr<'a>> {
+        super::child_opt(self)
+    }
+}
 
 // RangeExpr
 #[derive(Debug, Clone, Copy,)]
@@ -2940,7 +2960,11 @@ impl<R: TreeRoot<RaTypes>> RefExprNode<R> {
 }
 
 
-impl<'a> RefExpr<'a> {}
+impl<'a> RefExpr<'a> {
+    pub fn expr(self) -> Option<Expr<'a>> {
+        super::child_opt(self)
+    }
+}
 
 // RefPat
 #[derive(Debug, Clone, Copy,)]
@@ -3088,7 +3112,11 @@ impl<R: TreeRoot<RaTypes>> ReturnExprNode<R> {
 }
 
 
-impl<'a> ReturnExpr<'a> {}
+impl<'a> ReturnExpr<'a> {
+    pub fn expr(self) -> Option<Expr<'a>> {
+        super::child_opt(self)
+    }
+}
 
 // SelfParam
 #[derive(Debug, Clone, Copy,)]
@@ -3578,7 +3606,11 @@ impl<R: TreeRoot<RaTypes>> TryExprNode<R> {
 }
 
 
-impl<'a> TryExpr<'a> {}
+impl<'a> TryExpr<'a> {
+    pub fn expr(self) -> Option<Expr<'a>> {
+        super::child_opt(self)
+    }
+}
 
 // TupleExpr
 #[derive(Debug, Clone, Copy,)]

crates/ra_syntax/src/grammar.ron

@@ -346,7 +346,7 @@ Grammar(
 
         "TupleExpr": (),
         "ArrayExpr": (),
-        "ParenExpr": (),
+        "ParenExpr": (options: ["Expr"]),
         "PathExpr": (options: ["Path"]),
         "LambdaExpr": (
             options: [
@@ -377,7 +377,7 @@ Grammar(
         "BlockExpr": (
             options: [ "Block" ]
         ),
-        "ReturnExpr": (),
+        "ReturnExpr": (options: ["Expr"]),
         "MatchExpr": (
             options: [ "Expr", "MatchArmList" ],
         ),
@@ -405,10 +405,10 @@ Grammar(
         ),
         "IndexExpr": (),
         "FieldExpr": (),
-        "TryExpr": (),
-        "CastExpr": (),
-        "RefExpr": (),
-        "PrefixExpr": (),
+        "TryExpr": (options: ["Expr"]),
+        "CastExpr": (options: ["Expr", "TypeRef"]),
+        "RefExpr": (options: ["Expr"]),
+        "PrefixExpr": (options: ["Expr"]),
         "RangeExpr": (),
         "BinExpr": (),
         "String": (),
@@ -521,7 +521,7 @@ Grammar(
         ),
         "SelfParam": (),
         "Param": (
-            options: [ "Pat" ],
+            options: [ "Pat", "TypeRef" ],
         ),
         "UseItem": (
             options: [ "UseTree" ]