message: Remove usage of quasi-quoting in tests
  Only clippy and cargo use the old quasi quoting stuff, and we should be
  removing it.
diff: @@ -164,7 +164,9 @@ fn plugin_deps() {
  use rustc_plugin::Registry;
  use syntax::tokenstream::TokenTree;
  use syntax::codemap::Span;
  + use syntax::ast::*;
  use syntax::ext::base::{ExtCtxt, MacEager, MacResult};
  + use syntax::ext::build::AstBuilder;
  #[plugin_registrar]
  pub fn foo(reg: &mut Registry) {
  @@ -173,7 +175,7 @@ fn plugin_deps() {
  fn expand_bar(cx: &mut ExtCtxt, sp: Span, tts: &[TokenTree])
  -> Box<MacResult + 'static> {
  - MacEager::expr(quote_expr!(cx, 1))
  + MacEager::expr(cx.expr_lit(sp, LitKind::Int(1, LitIntType::Unsuffixed)))
  }
  "#)
  .build();
  @@ -247,7 +249,10 @@ fn plugin_to_the_max() {
  use rustc_plugin::Registry;
  use syntax::tokenstream::TokenTree;
  use syntax::codemap::Span;
  + use syntax::ast::*;
  use syntax::ext::base::{ExtCtxt, MacEager, MacResult};
  + use syntax::ext::build::AstBuilder;
  + use syntax::ptr::P;
  #[plugin_registrar]
  pub fn foo(reg: &mut Registry) {
  @@ -256,7 +261,9 @@ fn plugin_to_the_max() {
  fn expand_bar(cx: &mut ExtCtxt, sp: Span, tts: &[TokenTree])
  -> Box<MacResult + 'static> {
  - MacEager::expr(quote_expr!(cx, baz::baz()))
  + let bar = Ident::from_str("baz");
  + let path = cx.path(sp, vec![bar.clone(), bar]);
  + MacEager::expr(cx.expr_call(sp, cx.expr_path(path), vec![]))
  }
  "#)
  .build();
  