net: move into tokio crate (#1683)

A step towards collapsing Tokio sub crates into a single `tokio`
crate (#1318).

The `net` implementation is now provided by the main `tokio` crate.
Functionality can be opted out of by using the various net related
feature flags.

111 files changed, 580 insertions, 870 deletions

diff --git a/Cargo.toml b/Cargo.toml
index da766769..38a26aeb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,7 +5,6 @@ members = [
   "tokio-executor",
   "tokio-io",
   "tokio-macros",
-  "tokio-net",
   "tokio-sync",
   "tokio-test",
   "tokio-tls",
@@ -13,5 +12,6 @@ members = [
 
   # Internal
   "examples",
-  "build-tests",
+  "tests-build",
+  "tests-integration",
 ]
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 2acdb522..1dad7b1d 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -28,7 +28,7 @@ jobs:
       tokio:
         - fs
         - io
-        - net
+        - net-driver
         - process
         - rt-full
         - signal
@@ -37,21 +37,7 @@ jobs:
         - timer
         - udp
         - uds
-
-# Test crates that are platform specific
-- template: ci/azure-test-stable.yml
-  parameters:
-    name: test_sub_cross
-    displayName: Test sub crates (cross) -
-    cross: true
-    rust: beta
-    crates:
-      tokio-net:
-        - process
-        - signal
-        - tcp
-        - udp
-        - uds
+      tests-integration: []
 
 # Test crates that are NOT platform specific
 - template: ci/azure-test-stable.yml
@@ -79,21 +65,21 @@ jobs:
     displayName: Test feature flags
     rust: beta
     crates:
-      build-tests:
+      tests-build:
         - tokio-executor
-        - tokio-net
         - executor-without-current-thread
-        - macros-invalid-input
-        - net-no-features
-        - net-with-tcp
-        - net-with-udp
-        - net-with-uds
-        - tokio-no-features
-        - tokio-with-net
+        # - macros-invalid-input
+        # - net-no-features
+        # - net-with-tcp
+        # - net-with-udp
+        # - net-with-uds
+        # - tokio-no-features
+        # - tokio-with-net
 
 # Run loom tests
 - template: ci/azure-loom.yml
   parameters:
+    name: loom
     rust: beta
     crates:
       - tokio-executor
@@ -128,9 +114,9 @@ jobs:
       - rustfmt
       - clippy
       - test_tokio
-      - test_sub_cross
       - test_linux
       - test_features
+      - loom
 #      - test_nightly
       - cross
 #      - minrust
diff --git a/build-tests/Cargo.toml b/build-tests/Cargo.toml
deleted file mode 100644
index dfd4f8b4..00000000
--- a/build-tests/Cargo.toml
+++ /dev/null
@@ -1,27 +0,0 @@
-[package]
-name = "build-tests"
-version = "0.1.0"
-authors = ["Tokio Contributors <team@tokio.rs>"]
-edition = "2018"
-publish = false
-
-[features]
-executor-without-current-thread = ["tokio-executor"]
-macros-invalid-input = ["tokio/rt-full"]
-net-no-features = ["tokio-net"]
-net-with-tcp = ["tokio-net/tcp"]
-net-with-udp = ["tokio-net/udp"]
-net-with-uds = ["tokio-net/uds"]
-net-with-process = ["tokio-net/process"]
-tokio-no-features = ["tokio"]
-tokio-with-net = ["tokio/net"]
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[dependencies]
-tokio-executor = { path = "../tokio-executor", optional = true }
-tokio-net = { path = "../tokio-net", optional = true }
-tokio = { path = "../tokio", optional = true, default-features = false }
-
-[dev-dependencies]
-trybuild = "1.0"
diff --git a/build-tests/tests/fail/executor_without_current_thread.rs b/build-tests/tests/fail/executor_without_current_thread.rs
deleted file mode 100644
index 469bd966..00000000
--- a/build-tests/tests/fail/executor_without_current_thread.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-use build_tests::tokio_executor::current_thread;
-
-fn main() {}
diff --git a/build-tests/tests/fail/net_without_tcp_missing_tcp.rs b/build-tests/tests/fail/net_without_tcp_missing_tcp.rs
deleted file mode 100644
index c407e4ab..00000000
--- a/build-tests/tests/fail/net_without_tcp_missing_tcp.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-use build_tests::tokio_net::tcp;
-
-fn main() {}
-
diff --git a/build-tests/tests/fail/net_without_udp_missing_udp.rs b/build-tests/tests/fail/net_without_udp_missing_udp.rs
deleted file mode 100644
index 56b726d2..00000000
--- a/build-tests/tests/fail/net_without_udp_missing_udp.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-use build_tests::tokio_net::udp;
-
-fn main() {}
-
diff --git a/build-tests/tests/fail/net_without_uds_missing_uds.rs b/build-tests/tests/fail/net_without_uds_missing_uds.rs
deleted file mode 100644
index fb0dece2..00000000
--- a/build-tests/tests/fail/net_without_uds_missing_uds.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-use build_tests::tokio_net::uds;
-
-fn main() {}
-
diff --git a/build-tests/tests/fail/tokio_without_net_missing_net.rs b/build-tests/tests/fail/tokio_without_net_missing_net.rs
deleted file mode 100644
index db5debe9..00000000
--- a/build-tests/tests/fail/tokio_without_net_missing_net.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-use build_tests::tokio::net;
-
-fn main() {}
diff --git a/ci/azure-loom.yml b/ci/azure-loom.yml
index c57bc732..c08b68ca 100644
--- a/ci/azure-loom.yml
+++ b/ci/azure-loom.yml
@@ -1,5 +1,5 @@
 jobs:
-- job: loom
+- job: ${{ parameters.name }}
   displayName: Loom tests
   pool:
     vmImage: ubuntu-16.04
diff --git a/ci/patch.toml b/ci/patch.toml
index 6d739341..02290de0 100644
--- a/ci/patch.toml
+++