1 files changed, 5 insertions, 7 deletions
diff --git a/compiler/rustc_span/src/lib.rs b/compiler/rustc_span/src/lib.rs
index f749d4eb833..b2ca01fe3b9 100644
--- a/compiler/rustc_span/src/lib.rs
+++ b/compiler/rustc_span/src/lib.rs
@@ -33,18 +33,16 @@
 #![feature(rustdoc_internals)]
 // tidy-alphabetical-end
 
+// The code produced by the `Encodable`/`Decodable` derive macros refer to
+// `rustc_span::Span{Encoder,Decoder}`. That's fine outside this crate, but doesn't work inside
+// this crate without this line making `rustc_span` available.
 extern crate self as rustc_span;
 
-#[macro_use]
-extern crate rustc_macros;
-
-#[macro_use]
-extern crate tracing;
-
 use rustc_data_structures::{outline, AtomicRef};
-use rustc_macros::HashStable_Generic;
+use rustc_macros::{Decodable, Encodable, HashStable_Generic};
 use rustc_serialize::opaque::{FileEncoder, MemDecoder};
 use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
+use tracing::debug;
 
 mod caching_source_map_view;
 pub mod source_map;