Update codegen for 2018-05-30 nightly.

codegen/build.rs

@@ -8,8 +8,8 @@ use yansi::Color::{Red, Yellow, Blue, White};
 use version_check::{supports_features, is_min_version, is_min_date};
 
 // Specifies the minimum nightly version needed to compile Rocket's codegen.
-const MIN_DATE: &'static str = "2018-05-04";
-const MIN_VERSION: &'static str = "1.27.0-nightly";
+const MIN_DATE: &'static str = "2018-05-30";
+const MIN_VERSION: &'static str = "1.28.0-nightly";
 
 fn main() {
     let ok_channel = supports_features();

codegen/src/utils/mod.rs

@@ -15,15 +15,15 @@ use std::convert::AsRef;
 use syntax;
 use syntax::parse::token::Token;
 use syntax::tokenstream::TokenTree;
-use syntax::ast::{Item, Expr};
+use syntax::ast::{Item, Expr, Attribute, Ty};
 use syntax::ext::base::{Annotatable, ExtCtxt};
 use syntax::codemap::{Span, Spanned, DUMMY_SP};
 use syntax::ext::quote::rt::ToTokens;
 use syntax::print::pprust::item_to_string;
-use syntax::ptr::P;
+use syntax::symbol::{Ident, Symbol};
 use syntax::fold::Folder;
-use syntax::ast::{Attribute, Lifetime, LifetimeDef, Ty};
 use syntax::attr::HasAttrs;
+use syntax::ptr::P;
 
 pub fn span<T>(t: T, span: Span) -> Spanned<T> {
     Spanned { node: t, span: span }
@@ -91,18 +91,13 @@ macro_rules! quote_enum {
 
 pub struct TyLifetimeRemover;
 
-// FIXME: Doesn't work for T + whatever.
 impl Folder for TyLifetimeRemover {
-    fn fold_opt_lifetime(&mut self, _: Option<Lifetime>) -> Option<Lifetime> {
-        None
-    }
-
-    fn fold_lifetime_defs(&mut self, _: Vec<LifetimeDef>) -> Vec<LifetimeDef> {
-        vec![]
-    }
-
-    fn fold_lifetimes(&mut self, _: Vec<Lifetime>) -> Vec<Lifetime> {
-        vec![]
+    fn fold_ident(&mut self, ident: Ident) -> Ident {
+        if ident.as_str().starts_with('\'') {
+            Ident::new(Symbol::intern("'_"), ident.span)
+        } else {
+            ident
+        }
     }
 }