removed unneeded brackets on import

Author: MarcusDunn

compiler/rustc_mir_build/src/thir/pattern/check_match.rs

@@ -17,7 +17,7 @@ use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_session::lint::builtin::BINDINGS_WITH_VARIANT_NAME;
 use rustc_session::lint::builtin::{IRREFUTABLE_LET_PATTERNS, UNREACHABLE_PATTERNS};
 use rustc_session::Session;
-use rustc_span::{Span};
+use rustc_span::Span;
 use std::slice;
 
 crate fn check_match(tcx: TyCtxt<'_>, def_id: DefId) {