Rollup merge of #34385 - cgswords:tstream, r=nrc

syntax-[breaking-change] cc #31645
(Only breaking because ast::TokenTree is now tokenstream::TokenTree.)

This pull request refactors TokenTrees into their own file as src/libsyntax/tokenstream.rs, moving them out of src/libsyntax/ast.rs, in order to prepare for an accompanying TokenStream implementation (per RFC 1566).

1 files changed, 2 insertions, 1 deletions

diff --git a/src/libsyntax/diagnostics/plugin.rs b/src/libsyntax/diagnostics/plugin.rs
index abf2b39d5c6..4e50299e836 100644
--- a/src/libsyntax/diagnostics/plugin.rs
+++ b/src/libsyntax/diagnostics/plugin.rs
@@ -13,12 +13,13 @@ use std::collections::BTreeMap;
 use std::env;
 
 use ast;
-use ast::{Ident, Name, TokenTree};
+use ast::{Ident, Name};
 use syntax_pos::Span;
 use ext::base::{ExtCtxt, MacEager, MacResult};
 use ext::build::AstBuilder;
 use parse::token;
 use ptr::P;
+use tokenstream::{TokenTree};
 use util::small_vector::SmallVector;
 
 use diagnostics::metadata::output_metadata;