chore: move benches to separate crate (#2028)

This allows the `benches` crate to depend on `tokio` with all feature
flags. This is a similar strategy used for `examples`.

Cargo.toml

@@ -8,6 +8,7 @@ members = [
   "tokio-util",
 
   # Internal
+  "benches",
   "examples",
   "tests-build",
   "tests-integration",

benches/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "benches"
+version = "0.0.0"
+publish = false
+edition = "2018"
+
+[dependencies]
+tokio = { version = "0.2.0", path = "../tokio", features = ["full"] }
+bencher = "0.1.5"
+
+[[bench]]
+name = "spawn"
+path = "spawn.rs"
+harness = false

ci/azure-test-stable.yml

@@ -30,6 +30,11 @@ jobs:
       displayName: ${{ crate }} - cargo test --all-features
       workingDirectory: $(Build.SourcesDirectory)/${{ crate }}
 
+    # Check benches
+    - script: cargo check --all-features --benches
+      displayName: ${{ crate }} - cargo check --benches
+      workingDirectory: $(Build.SourcesDirectory)/${{ crate }}
+
   - template: azure-patch-crates.yml
 
   - ${{ each crate in parameters.crates }}:

tokio/Cargo.toml

@@ -127,7 +127,6 @@ futures = { version = "0.3.0", features = ["async-await"] }
 loom = { version = "0.2.13", features = ["futures", "checkpoint"] }
 proptest = "0.9.4"
 tempfile = "3.1.0"
-bencher = "0.1.5"
 
 [package.metadata.docs.rs]
 all-features = true
@@ -135,7 +134,3 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [package.metadata.playground]
 features = ["full"]
-
-[[bench]]
-name = "spawn"
-harness = false