Remove #[macro_use] extern crate tracing from rustc_parse.

compiler/rustc_parse/src/parser/expr.rs

@@ -36,6 +36,7 @@ use rustc_span::source_map::{self, Spanned};
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::{BytePos, ErrorGuaranteed, Pos, Span};
 use thin_vec::{thin_vec, ThinVec};
+use tracing::instrument;
 
 /// Possibly accepts an `token::Interpolated` expression (a pre-parsed expression
 /// dropped into the token stream, which happens while parsing the result of