Update codegen for latest nightly.

codegen/src/macros/uri.rs

@@ -3,7 +3,7 @@ use std::fmt::Display;
 use syntax::codemap::Span;
 use syntax::ext::base::{DummyResult, ExtCtxt, MacEager, MacResult};
 use syntax::tokenstream::{TokenStream, TokenTree};
-use syntax::ast::{self, Ident};
+use syntax::ast::{self, MacDelimiter, Ident};
 use syntax::symbol::Symbol;
 use syntax::parse::PResult;
 use syntax::ext::build::AstBuilder;
@@ -29,6 +29,7 @@ pub fn uri(
     let expr = parser.mk_mac_expr(sp,
         ast::Mac_ {
             path: path,
+            delim: MacDelimiter::Parenthesis,
             tts: args.to_vec().into_iter().collect::<TokenStream>().into(),
         },
         ::syntax::util::ThinVec::new(),

codegen_next/src/lib.rs

@@ -98,6 +98,6 @@ fn real_derive_from_form_value(input: TokenStream) -> PResult<TokenStream> {
 pub fn derive_from_form_value(input: TokenStream) -> TokenStream {
     real_derive_from_form_value(input).unwrap_or_else(|diag| {
         diag.emit();
-        TokenStream::empty()
+        TokenStream::new()
     })
 }