diff --git a/Cargo.lock b/Cargo.lock
index d81fd6e8d3afd..2394565dfb0dc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4173,6 +4173,7 @@ dependencies = [
  "rustc_lexer",
  "rustc_session",
  "rustc_span",
+ "smallvec 1.4.0",
  "unicode-normalization",
 ]
 
diff --git a/src/librustc_ast/tokenstream.rs b/src/librustc_ast/tokenstream.rs
index ff3469930c6d3..9d0199078fa6a 100644
--- a/src/librustc_ast/tokenstream.rs
+++ b/src/librustc_ast/tokenstream.rs
@@ -21,8 +21,6 @@ use rustc_macros::HashStable_Generic;
 use rustc_span::{Span, DUMMY_SP};
 use smallvec::{smallvec, SmallVec};
 
-use log::debug;
-
 use std::{iter, mem};
 
 /// When the main rust parser encounters a syntax-extension invocation, it
diff --git a/src/librustc_parse/Cargo.toml b/src/librustc_parse/Cargo.toml
index 7164c67880863..0d31a8c7bc1fb 100644
--- a/src/librustc_parse/Cargo.toml
+++ b/src/librustc_parse/Cargo.toml
@@ -12,6 +12,7 @@ doctest = false
 [dependencies]
 bitflags = "1.0"
 log = "0.4"
+smallvec = { version = "1.0", features = ["union", "may_dangle"] }
 rustc_ast_pretty = { path = "../librustc_ast_pretty" }
 rustc_data_structures = { path = "../librustc_data_structures" }
 rustc_feature = { path = "../librustc_feature" }
diff --git a/src/librustc_parse/lib.rs b/src/librustc_parse/lib.rs
index 352278d252616..0c817a712819f 100644
--- a/src/librustc_parse/lib.rs
+++ b/src/librustc_parse/lib.rs
@@ -14,7 +14,9 @@ use rustc_data_structures::sync::Lrc;
 use rustc_errors::{Diagnostic, FatalError, Level, PResult};
 use rustc_session::parse::ParseSess;
 use rustc_span::symbol::kw;
-use rustc_span::{FileName, SourceFile, Span};
+use rustc_span::{FileName, SourceFile, Span, DUMMY_SP};
+
+use smallvec::SmallVec;
 
 use std::mem;
 use std::path::Path;