diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
index 97cb8ed45b91..cd089b70d779 100644
--- a/src/tools/tidy/src/deps.rs
+++ b/src/tools/tidy/src/deps.rs
@@ -53,61 +53,61 @@ static WHITELIST_CRATES: &'static [Crate] = &[Crate("rustc"), Crate("rustc_trans
 
 /// Whitelist of crates rustc is allowed to depend on. Avoid adding to the list if possible.
 static WHITELIST: &'static [Crate] = &[
-//    Crate("ar "),
-//    Crate("arena "),
-//    Crate("backtrace "),
-//    Crate("backtrace-sys "),
-//    Crate("bitflags "),
-//    Crate("build_helper "),
-//    Crate("byteorder "),
-//    Crate("cc "),
-//    Crate("cfg-if "),
-//    Crate("cmake "),
-//    Crate("filetime "),
-//    Crate("flate2 "),
-//    Crate("fmt_macros "),
-//    Crate("fuchsia-zircon "),
-//    Crate("fuchsia-zircon-sys "),
-//    Crate("graphviz "),
-//    Crate("jobserver "),
-//    Crate("kernel32-sys "),
-//    Crate("lazy_static "),
-//    Crate("libc "),
-//    Crate("log "),
-//    Crate("log_settings "),
-//    Crate("miniz-sys "),
-//    Crate("num_cpus "),
-//    Crate("owning_ref "),
-//    Crate("parking_lot "),
-//    Crate("parking_lot_core "),
-//    Crate("rand "),
-//    Crate("redox_syscall "),
-//    Crate("rustc "),
-//    Crate("rustc-demangle "),
-//    Crate("rustc_allocator "),
-//    Crate("rustc_apfloat "),
-//    Crate("rustc_back "),
-//    Crate("rustc_binaryen "),
-//    Crate("rustc_const_eval "),
-//    Crate("rustc_const_math "),
-//    Crate("rustc_cratesio_shim "),
-//    Crate("rustc_data_structures "),
-//    Crate("rustc_errors "),
-//    Crate("rustc_incremental "),
-//    Crate("rustc_llvm "),
-//    Crate("rustc_mir "),
-//    Crate("rustc_platform_intrinsics "),
-//    Crate("rustc_trans "),
-//    Crate("rustc_trans_utils "),
-//    Crate("serialize "),
-//    Crate("smallvec "),
-//    Crate("stable_deref_trait "),
-//    Crate("syntax "),
-//    Crate("syntax_pos "),
-//    Crate("tempdir "),
-//    Crate("unicode-width "),
-//    Crate("winapi "),
-//    Crate("winapi-build"),
+    Crate("ar "),
+    Crate("arena "),
+    Crate("backtrace "),
+    Crate("backtrace-sys "),
+    Crate("bitflags "),
+    Crate("build_helper "),
+    Crate("byteorder "),
+    Crate("cc "),
+    Crate("cfg-if "),
+    Crate("cmake "),
+    Crate("filetime "),
+    Crate("flate2 "),
+    Crate("fmt_macros "),
+    Crate("fuchsia-zircon "),
+    Crate("fuchsia-zircon-sys "),
+    Crate("graphviz "),
+    Crate("jobserver "),
+    Crate("kernel32-sys "),
+    Crate("lazy_static "),
+    Crate("libc "),
+    Crate("log "),
+    Crate("log_settings "),
+    Crate("miniz-sys "),
+    Crate("num_cpus "),
+    Crate("owning_ref "),
+    Crate("parking_lot "),
+    Crate("parking_lot_core "),
+    Crate("rand "),
+    Crate("redox_syscall "),
+    Crate("rustc "),
+    Crate("rustc-demangle "),
+    Crate("rustc_allocator "),
+    Crate("rustc_apfloat "),
+    Crate("rustc_back "),
+    Crate("rustc_binaryen "),
+    Crate("rustc_const_eval "),
+    Crate("rustc_const_math "),
+    Crate("rustc_cratesio_shim "),
+    Crate("rustc_data_structures "),
+    Crate("rustc_errors "),
+    Crate("rustc_incremental "),
+    Crate("rustc_llvm "),
+    Crate("rustc_mir "),
+    Crate("rustc_platform_intrinsics "),
+    Crate("rustc_trans "),
+    Crate("rustc_trans_utils "),
+    Crate("serialize "),
+    Crate("smallvec "),
+    Crate("stable_deref_trait "),
+    Crate("syntax "),
+    Crate("syntax_pos "),
+    Crate("tempdir "),
+    Crate("unicode-width "),
+    Crate("winapi "),
+    Crate("winapi-build"),
 ];
 
 // Some types for Serde to deserialize the output of `cargo metadata` to...