better self-types

crates/libsyntax2/src/grammar/items/mod.rs

@@ -208,7 +208,7 @@ fn extern_crate_item(p: &mut Parser) {
     assert!(p.at(CRATE_KW));
     p.bump();
     name(p);
-    alias(p);
+    opt_alias(p);
     p.expect(SEMI);
 }
 

crates/libsyntax2/src/grammar/items/use_item.rs

@@ -26,7 +26,7 @@ fn use_tree(p: &mut Parser) {
             paths::use_path(p);
             match p.current() {
                 AS_KW => {
-                    alias(p);
+                    opt_alias(p);
                 }
                 COLONCOLON => {
                     p.bump();

crates/libsyntax2/src/grammar/mod.rs

@@ -92,14 +92,14 @@ fn opt_visibility(p: &mut Parser) {
         _ => (),
     }
 }
-fn alias(p: &mut Parser) -> bool {
+
+fn opt_alias(p: &mut Parser) {
     if p.at(AS_KW) {
-        let alias = p.start();
+        let m = p.start();
         p.bump();
         name(p);
-        alias.complete(p, ALIAS);
+        m.complete(p, ALIAS);
     }
-    true //FIXME: return false if three are errors
 }
 
 fn abi(p: &mut Parser) {

crates/libsyntax2/src/grammar/params.rs

@@ -92,16 +92,18 @@ fn value_parameter(p: &mut Parser, flavor: Flavor) {
 //     fn b(&self,) {}
 //     fn c(&'a self,) {}
 //     fn d(&'a mut self, x: i32) {}
+//     fn e(mut self) {}
 // }
 fn self_param(p: &mut Parser) {
     let m;
-    if p.at(SELF_KW) {
+    if p.at(SELF_KW) || p.at(MUT_KW) && p.nth(1) == SELF_KW {
         m = p.start();
-        p.bump();
+        p.eat(MUT_KW);
+        p.eat(SELF_KW);
         // test arb_self_types
         // impl S {
         //     fn a(self: &Self) {}
-        //     fn b(self: Box<Self>) {}
+        //     fn b(mut self: Box<Self>) {}
         // }
         if p.at(COLON) {
             types::ascription(p);