chore: check each feature works properly (#1695)

It is hard to maintain features list manually, so use cargo-hack's
`--each-feature` flag. And cargo-hack provides a workaround for an issue
that dev-dependencies leaking into normal build (`--no-dev-deps` flag),
so removed own ci tool.

Also, compared to running tests on all features, there is not much
advantage in running tests on each feature, so only the default features
and all features are tested.
If the behavior changes depending on the feature, we need to test it as
another job in CI.

tests-build/tests/fail/executor_without_current_thread.rs

@@ -1,3 +0,0 @@
-use tests_build::tokio_executor::current_thread;
-
-fn main() {}

tests-build/tests/fail/executor_without_current_thread.stderr

@@ -1,7 +0,0 @@
-error[E0432]: unresolved import `tests_build::tokio_executor::current_thread`
- --> $DIR/executor_without_current_thread.rs:1:5
-  |
-1 | use tests_build::tokio_executor::current_thread;
-  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `current_thread` in `tokio_executor`
-
-For more information about this error, try `rustc --explain E0432`.

tests-build/tests/fail/macros_invalid_input.rs

@@ -1,25 +0,0 @@
-use tests_build::tokio;
-
-#[tokio::main]
-fn main_is_not_async() {}
-
-#[tokio::main(foo)]
-async fn main_attr_has_unknown_args() {}
-
-#[tokio::main(threadpool::bar)]
-async fn main_attr_has_path_args() {}
-
-#[tokio::test]
-fn test_is_not_async() {}
-
-#[tokio::test]
-async fn test_fn_has_args(_x: u8) {}
-
-#[tokio::test(foo)]
-async fn test_attr_has_args() {}
-
-#[tokio::test]
-#[test]
-async fn test_has_second_test_attr() {}
-
-fn main() {}

tests-build/tests/fail/macros_invalid_input.stderr

@@ -1,41 +0,0 @@
-error: the async keyword is missing from the function declaration
- --> $DIR/macros_invalid_input.rs:4:1
-  |
-4 | fn main_is_not_async() {}
-  | ^^
-
-error: Unknown attribute foo is specified; expected `current_thread` or `threadpool`
- --> $DIR/macros_invalid_input.rs:6:15
-  |
-6 | #[tokio::main(foo)]
-  |               ^^^
-
-error: Must have specified ident
- --> $DIR/macros_invalid_input.rs:9:15
-  |
-9 | #[tokio::main(threadpool::bar)]
-  |               ^^^^^^^^^^^^^^^
-
-error: the async keyword is missing from the function declaration
-  --> $DIR/macros_invalid_input.rs:13:1
-   |
-13 | fn test_is_not_async() {}
-   | ^^
-
-error: the test function cannot accept arguments
-  --> $DIR/macros_invalid_input.rs:16:27
-   |
-16 | async fn test_fn_has_args(_x: u8) {}
-   |                           ^^^^^^
-
-error: Unknown attribute foo is specified; expected `current_thread` or `threadpool`
-  --> $DIR/macros_invalid_input.rs:18:15
-   |
-18 | #[tokio::test(foo)]
-   |               ^^^
-
-error: second test attribute is supplied
-  --> $DIR/macros_invalid_input.rs:22:1
-   |
-22 | #[test]
-   | ^^^^^^^

tests-build/tests/fail/net_without_tcp_missing_tcp.rs

@@ -1,4 +0,0 @@
-use tests_build::tokio_net::tcp;
-
-fn main() {}
-

tests-build/tests/fail/net_without_tcp_missing_tcp.stderr

@@ -1,7 +0,0 @@
-error[E0432]: unresolved import `tests_build::tokio_net::tcp`
- --> $DIR/net_without_tcp_missing_tcp.rs:1:5
-  |
-1 | use tests_build::tokio_net::tcp;
-  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `tcp` in `tokio_net`
-
-For more information about this error, try `rustc --explain E0432`.

tests-build/tests/fail/net_without_udp_missing_udp.rs

@@ -1,4 +0,0 @@
-use tests_build::tokio_net::udp;
-
-fn main() {}
-

tests-build/tests/fail/net_without_udp_missing_udp.stderr

@@ -1,7 +0,0 @@
-error[E0432]: unresolved import `tests_build::tokio_net::udp`
- --> $DIR/net_without_udp_missing_udp.rs:1:5
-  |
-1 | use tests_build::tokio_net::udp;
-  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `udp` in `tokio_net`
-
-For more information about this error, try `rustc --explain E0432`.

tests-build/tests/fail/net_without_uds_missing_uds.rs

@@ -1,4 +0,0 @@
-use tests_build::tokio_net::uds;
-
-fn main() {}
-

tests-build/tests/fail/net_without_uds_missing_uds.stderr

@@ -1,7 +0,0 @@
-error[E0432]: unresolved import `tests_build::tokio_net::uds`
- --> $DIR/net_without_uds_missing_uds.rs:1:5
-  |
-1 | use tests_build::tokio_net::uds;
-  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `uds` in `tokio_net`
-
-For more information about this error, try `rustc --explain E0432`.

tests-build/tests/fail/tokio_without_net_missing_net.rs

@@ -1,3 +0,0 @@
-use tests_build::tokio::net;
-
-fn main() {}

tests-build/tests/fail/tokio_without_net_missing_net.stderr

@@ -1,7 +0,0 @@
-error[E0432]: unresolved import `tests_build::tokio::net`
- --> $DIR/tokio_without_net_missing_net.rs:1:5
-  |
-1 | use tests_build::tokio::net;
-  |     ^^^^^^^^^^^^^^^^^^^^^^^ no `net` in `tokio`
-
-For more information about this error, try `rustc --explain E0432`.