chore: check each feature works properly

azure-pipelines.yml

@@ -28,6 +28,7 @@ jobs:
       tokio:
         - fs
         - io
+        - io-traits
         - io-util
         - net-driver
         - process

ci/azure-test-stable.yml

@@ -59,3 +59,18 @@ jobs:
           CI: 'True'
         displayName: ${{ crate.key }} - cargo test --features ${{ feature }}
         workingDirectory: $(Build.SourcesDirectory)/${{ crate.key }}
+
+  # Remove all dev-dependencies to avoid https://github.com/rust-lang/cargo/issues/4866.
+  - bash: cargo run --manifest-path ci/remove-dev-dependencies/Cargo.toml ./*/Cargo.toml
+    displayName: Remove dev-dependencies
+
+  # Check each specified feature works properly
+  - ${{ each crate in parameters.crates }}:
+    # Run with each specified feature
+    - ${{ each feature in crate.value }}:
+      - script: cargo check --no-default-features --features ${{ feature }}
+        env:
+          LOOM_MAX_PREEMPTIONS: 2
+          CI: 'True'
+        displayName: ${{ crate.key }} - cargo check --features ${{ feature }}
+        workingDirectory: $(Build.SourcesDirectory)/${{ crate.key }}

ci/remove-dev-dependencies/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "remove-dev-dependencies"
+version = "0.1.0"
+authors = ["Tokio Contributors <team@tokio.rs>"]
+edition = "2018"
+publish = false
+
+[workspace]
+
+[dependencies]
+toml_edit = "0.1.5"

ci/remove-dev-dependencies/src/main.rs

@@ -0,0 +1,25 @@
+use std::{env, fs};
+
+fn main() {
+    let res: Result<(), Box<dyn std::error::Error>> = env::args_os().skip(1).try_for_each(|file| {
+        let mut doc: toml_edit::Document = fs::read_to_string(&file)?.parse()?;
+        let table = doc.as_table_mut();
+        table.remove("dev-dependencies");
+        if let Some(table) = table.entry("target").as_table_mut() {
+            // `toml_edit::Table` does not have `.iter_mut()`, so collect keys.
+            let keys: Vec<String> = table.iter().map(|(key, _)| key.to_string()).collect();
+            for key in keys {
+                if let Some(table) = table.entry(&key).as_table_mut() {
+                    table.remove("dev-dependencies");
+                }
+            }
+        }
+        fs::write(file, doc.to_string_in_original_order())?;
+        Ok(())
+    });
+
+    if let Err(e) = res {
+        eprintln!("{}", e);
+        std::process::exit(1)
+    }
+}

tokio/Cargo.toml

@@ -35,13 +35,19 @@ default = [
   "timer",
 ]
 
-fs = ["tokio-executor/blocking"]
+fs = ["io-traits", "tokio-executor/blocking"]
 io-traits = ["bytes", "iovec"]
 io-util = ["io-traits", "pin-project", "memchr"]
 io = ["io-traits", "io-util"]
 macros = ["tokio-macros"]
 net-full = ["tcp", "udp", "uds"]
-net-driver = ["mio", "tokio-executor/blocking"]
+net-driver = [
+  "io-traits",
+  "mio",
+  "slab",
+  "sync",
+  "tokio-executor/blocking",
+]
 rt-current-thread = [
   "timer",
   "tokio-executor/current-thread",
@@ -60,11 +66,18 @@ signal = [
   "libc",
   "mio-uds",
   "net-driver",
-  "signal-hook-registry"
+  "signal-hook-registry",
+  "winapi/consoleapi",
+  "winapi/minwindef",
 ]
 sync = ["tokio-sync"]
 tcp = ["io", "net-driver"]
-timer = ["crossbeam-utils", "slab"]
+timer = [
+  "crossbeam-utils",
+  "slab",
+  "sync",
+  "tokio-executor",
+]
 udp = ["io", "net-driver"]
 uds = ["io", "net-driver", "mio-uds", "libc"]
 process = [

tokio/src/lib.rs

@@ -91,7 +91,7 @@ pub mod fs;
 
 pub mod future;
 
-#[cfg(feature = "io")]
+#[cfg(feature = "io-traits")]
 pub mod io;
 
 #[cfg(feature = "net-driver")]