diff --git a/Cargo.lock b/Cargo.lock
index 3f7834fc5ff..acf8dfff8ce 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1050,7 +1050,6 @@ dependencies = [
  "smallvec 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "style 0.0.1",
  "style_traits 0.0.1",
- "stylo_tests 0.0.1",
 ]
 
 [[package]]
@@ -2807,24 +2806,10 @@ dependencies = [
  "android_injected_glue 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "backtrace 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "browserhtml 0.1.17 (git+https://github.com/browserhtml/browserhtml?branch=crate)",
- "deny_public_fields_tests 0.0.1",
- "gfx_tests 0.0.1",
  "glutin_app 0.0.1",
- "layout_tests 0.0.1",
  "libservo 0.0.1",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "malloc_size_of_tests 0.0.1",
- "metrics_tests 0.0.1",
- "msg_tests 0.0.1",
- "net_tests 0.0.1",
- "net_traits_tests 0.0.1",
- "profile_tests 0.0.1",
- "script_plugins_tests 0.0.1",
- "script_tests 0.0.1",
- "servo_config_tests 0.0.1",
- "servo_remutex_tests 0.0.1",
  "sig 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "style_tests 0.0.1",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 4dc921c54e6..3bde2968df8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,8 +1,16 @@
 [workspace]
 members = [
-    "ports/cef",
-    "ports/geckolib",
     "ports/servo",
+    "tests/unit/*",
+
+    "ports/geckolib",
+    "ports/geckolib/tests",
+
+    "ports/cef",
+]
+default-members = [
+    "ports/servo",
+    "tests/unit/*",
 ]
 exclude = [".cargo"]
 
diff --git a/components/dom_struct/lib.rs b/components/dom_struct/lib.rs
index a955f00ce87..41cf4a67527 100644
--- a/components/dom_struct/lib.rs
+++ b/components/dom_struct/lib.rs
@@ -19,5 +19,9 @@ pub fn dom_struct(args: TokenStream, input: TokenStream) -> TokenStream {
         #[must_root]
         #[repr(C)]
     };
+
+    // Work around https://github.com/rust-lang/rust/issues/46489
+    let attributes = attributes.to_string().parse().unwrap();
+
     iter::once(attributes).chain(iter::once(input)).collect()
 }
diff --git a/ports/geckolib/Cargo.toml b/ports/geckolib/Cargo.toml
index 70ffc615d9b..9fbe688571a 100644
--- a/ports/geckolib/Cargo.toml
+++ b/ports/geckolib/Cargo.toml
@@ -31,6 +31,3 @@ servo_arc = {path = "../../components/servo_arc"}
 smallvec = "0.6"
 style = {path = "../../components/style", features = ["gecko"]}
 style_traits = {path = "../../components/style_traits"}
-
-[dev-dependencies]
-stylo_tests = {path = "../../tests/unit/stylo"}
diff --git a/tests/unit/stylo/Cargo.toml b/ports/geckolib/tests/Cargo.toml
similarity index 100%
rename from tests/unit/stylo/Cargo.toml
rename to ports/geckolib/tests/Cargo.toml
diff --git a/tests/unit/stylo/build.rs b/ports/geckolib/tests/build.rs
similarity index 100%
rename from tests/unit/stylo/build.rs
rename to ports/geckolib/tests/build.rs
diff --git a/tests/unit/stylo/lib.rs b/ports/geckolib/tests/lib.rs
similarity index 100%
rename from tests/unit/stylo/lib.rs
rename to ports/geckolib/tests/lib.rs
diff --git a/tests/unit/stylo/servo_function_signatures.rs b/ports/geckolib/tests/servo_function_signatures.rs
similarity index 100%
rename from tests/unit/stylo/servo_function_signatures.rs
rename to ports/geckolib/tests/servo_function_signatures.rs
diff --git a/tests/unit/stylo/size_of.rs b/ports/geckolib/tests/size_of.rs
similarity index 100%
rename from tests/unit/stylo/size_of.rs
rename to ports/geckolib/tests/size_of.rs
diff --git a/tests/unit/stylo/specified_values.rs b/ports/geckolib/tests/specified_values.rs
similarity index 100%
rename from tests/unit/stylo/specified_values.rs
rename to ports/geckolib/tests/specified_values.rs
diff --git a/ports/servo/Cargo.toml b/ports/servo/Cargo.toml
index 489b6f63515..e872da5fe11 100644
--- a/ports/servo/Cargo.toml
+++ b/ports/servo/Cargo.toml
@@ -13,22 +13,6 @@ path = "main.rs"
 test = false
 bench = false
 
-[dev-dependencies]
-deny_public_fields_tests = {path = "../../tests/unit/deny_public_fields"}
-gfx_tests = {path = "../../tests/unit/gfx"}
-layout_tests = {path = "../../tests/unit/layout"}
-malloc_size_of_tests = {path = "../../tests/unit/malloc_size_of"}
-metrics_tests = {path = "../../tests/unit/metrics"}
-msg_tests = {path = "../../tests/unit/msg"}
-net_tests = {path = "../../tests/unit/net"}
-net_traits_tests = {path = "../../tests/unit/net_traits"}
-profile_tests = {path = "../../tests/unit/profile"}
-script_tests = {path = "../../tests/unit/script"}
-script_plugins_tests = {path = "../../tests/unit/script_plugins"}
-servo_config_tests = {path = "../../tests/unit/servo_config"}
-servo_remutex_tests = {path = "../../tests/unit/servo_remutex"}
-style_tests = {path = "../../tests/unit/style"}
-
 [features]
 default = ["unstable", "default-except-unstable"]
 default-except-unstable = ["webdriver", "max_log_level"]
@@ -38,7 +22,7 @@ energy-profiling = ["libservo/energy-profiling"]
 debugmozjs = ["libservo/debugmozjs"]
 googlevr = ["libservo/googlevr"]
 oculusvr = ["libservo/oculusvr"]
-unstable = ["libservo/unstable", "profile_tests/unstable"]
+unstable = ["libservo/unstable"]
 
 [dependencies]
 backtrace = "0.3"
diff --git a/python/servo/build_commands.py b/python/servo/build_commands.py
index 2ec27f00364..ea6ddca8725 100644
--- a/python/servo/build_commands.py
+++ b/python/servo/build_commands.py
@@ -402,8 +402,7 @@ class MachCommands(CommandBase):
         self.ensure_clobbered()
 
         ret = None
-        opts = []
-        opts += ["--manifest-path", self.cef_manifest()]
+        opts = ["-p", "embedding"]
 
         if jobs is not None:
             opts += ["-j", jobs]
@@ -458,8 +457,7 @@ class MachCommands(CommandBase):
         env = self.build_env(is_build=True, geckolib=True)
 
         ret = None
-        opts = []
-        opts += ["--manifest-path", self.geckolib_manifest()]
+        opts = ["-p", "geckoservo"]
         features = []
 
         if jobs is not None:
diff --git a/python/servo/devenv_commands.py b/python/servo/devenv_commands.py
index e6cb91bd20a..1ddba4af445 100644
--- a/python/servo/devenv_commands.py
+++ b/python/servo/devenv_commands.py
@@ -94,7 +94,7 @@ class MachCommands(CommandBase):
         'params', default=None, nargs='...',
         help="Command-line arguments to be passed through to cargo check")
     def check_geckolib(self, params):
-        return self.run_cargo(params, check=True, geckolib=True)
+        return self.run_cargo(["-p", "geckoservo"] + (params or []), check=True, geckolib=True)
 
     @Command('cargo-update',
              description='Same as update-cargo',
diff --git a/python/servo/testing_commands.py b/python/servo/testing_commands.py
index a72b6ef8f70..e0b9a4e7b28 100644
--- a/python/servo/testing_commands.py
+++ b/python/servo/testing_commands.py
@@ -254,6 +254,9 @@ class MachCommands(CommandBase):
         env = self.build_env()
         env["RUST_BACKTRACE"] = "1"
 
+        # Work around https://github.com/rust-lang/cargo/issues/4790
+        del env["RUSTDOCFLAGS"]
+
         if "msvc" in host_triple():
             # on MSVC, we need some DLLs in the path. They were copied
             # in to the servo.exe build dir, so just point PATH to that.
diff --git a/rust-toolchain b/rust-toolchain
index 45c170f9e3f..3e5d257a285 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2017-11-14
+nightly-2017-12-07
diff --git a/tests/unit/gfx/lib.rs b/tests/unit/gfx/lib.rs
index 9a5040b6fe1..a8120a50138 100644
--- a/tests/unit/gfx/lib.rs
+++ b/tests/unit/gfx/lib.rs
@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#![cfg(test)]
+
 extern crate gfx;
 
-#[cfg(test)] mod text_util;
+mod text_util;
diff --git a/tests/unit/layout/lib.rs b/tests/unit/layout/lib.rs
index a763135260a..d9e72841199 100644
--- a/tests/unit/layout/lib.rs
+++ b/tests/unit/layout/lib.rs
@@ -2,7 +2,6 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-extern crate layout;
-#[macro_use] extern crate size_of_test;
-
+#[cfg(all(test, target_pointer_width = "64"))] extern crate layout;
+#[cfg(all(test, target_pointer_width = "64"))] #[macro_use] extern crate size_of_test;
 #[cfg(all(test, target_pointer_width = "64"))] mod size_of;
diff --git a/tests/unit/metrics/lib.rs b/tests/unit/metrics/lib.rs
index abd6970f848..d773a632867 100644
--- a/tests/unit/metrics/lib.rs
+++ b/tests/unit/metrics/lib.rs
@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#![cfg(test)]
+
 extern crate euclid;
 extern crate gfx;
 extern crate gfx_traits;
@@ -13,7 +15,5 @@ extern crate profile_traits;
 extern crate style;
 extern crate time;
 
-#[cfg(test)]
 mod interactive_time;
-#[cfg(test)]
 mod paint_time;
diff --git a/tests/unit/msg/lib.rs b/tests/unit/msg/lib.rs
index c1bc9a119d9..62e591ef800 100644
--- a/tests/unit/msg/lib.rs
+++ b/tests/unit/msg/lib.rs
@@ -2,7 +2,6 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-extern crate msg;
-#[macro_use] extern crate size_of_test;
-
+#[cfg(all(test, target_pointer_width = "64"))] extern crate msg;
+#[cfg(all(test, target_pointer_width = "64"))] #[macro_use] extern crate size_of_test;
 #[cfg(all(test, target_pointer_width = "64"))] mod size_of;
diff --git a/tests/unit/net/lib.rs b/tests/unit/net/lib.rs
index 1d34d700a60..773b7f387f8 100644
--- a/tests/unit/net/lib.rs
+++ b/tests/unit/net/lib.rs
@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#![cfg(test)]
+
 extern crate cookie as cookie_rs;
 extern crate devtools_traits;
 extern crate flate2;
@@ -19,18 +21,18 @@ extern crate time;
 extern crate unicase;
 extern crate url;
 
-#[cfg(test)] mod chrome_loader;
-#[cfg(test)] mod cookie;
-#[cfg(test)] mod cookie_http_state;
-#[cfg(test)] mod data_loader;
-#[cfg(test)] mod file_loader;
-#[cfg(test)] mod fetch;
-#[cfg(test)] mod mime_classifier;
-#[cfg(test)] mod resource_thread;
-#[cfg(test)] mod hsts;
-#[cfg(test)] mod http_loader;
-#[cfg(test)] mod filemanager_thread;
-#[cfg(test)] mod subresource_integrity;
+mod chrome_loader;
+mod cookie;
+mod cookie_http_state;
+mod data_loader;
+mod fetch;
+mod file_loader;
+mod filemanager_thread;
+mod hsts;
+mod http_loader;
+mod mime_classifier;
+mod resource_thread;
+mod subresource_integrity;
 
 use devtools_traits::DevtoolsControlMsg;
 use hyper::server::{Handler, Listening, Server};
diff --git a/tests/unit/net_traits/lib.rs b/tests/unit/net_traits/lib.rs
index 3f722e5fc63..64135a6a2d4 100644
--- a/tests/unit/net_traits/lib.rs
+++ b/tests/unit/net_traits/lib.rs
@@ -2,10 +2,12 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#![cfg(test)]
+
 extern crate net_traits;
 
-#[cfg(test)] mod image;
-#[cfg(test)] mod pub_domains;
+mod image;
+mod pub_domains;
 
 #[test]
 fn test_trim_http_whitespace() {
diff --git a/tests/unit/profile/Cargo.toml b/tests/unit/profile/Cargo.toml
index 0d04fba813f..026593d80fa 100644
--- a/tests/unit/profile/Cargo.toml
+++ b/tests/unit/profile/Cargo.toml
@@ -9,9 +9,6 @@ name = "profile_tests"
 path = "lib.rs"
 doctest = false
 
-[features]
-unstable = ["servo_allocator/unstable"]
-
 [dependencies]
 ipc-channel = "0.9"
 profile = {path = "../../../components/profile"}
diff --git a/tests/unit/profile/lib.rs b/tests/unit/profile/lib.rs
index 110d8adedb4..2b97cd68cb3 100644
--- a/tests/unit/profile/lib.rs
+++ b/tests/unit/profile/lib.rs
@@ -2,10 +2,11 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#![cfg(test)]
+
 extern crate ipc_channel;
 extern crate profile;
 extern crate profile_traits;
 extern crate servo_allocator;
 
-#[cfg(test)]
 mod time;
diff --git a/tests/unit/style/lib.rs b/tests/unit/style/lib.rs
index 07d83afa261..9bcc92965e8 100644
--- a/tests/unit/style/lib.rs
+++ b/tests/unit/style/lib.rs
@@ -32,7 +32,7 @@ mod parsing;
 mod properties;
 mod rule_tree;
 mod size_of;
-#[path = "../stylo/specified_values.rs"]
+#[path = "../../../ports/geckolib/tests/specified_values.rs"]
 mod specified_values;
 mod str;
 mod stylesheets;