tokio: use cargo feature for taskdump support instead of cfg (#7655)

Signed-off-by: ADD-SP <[email protected]>
Co-authored-by: Alice Ryhl <[email protected]>

examples/Cargo.toml

@@ -24,6 +24,9 @@ httparse = "1.0"
 httpdate = "1.0"
 once_cell = "1.5.2"
 
+[target.'cfg(all(tokio_unstable, target_os = "linux"))'.dev-dependencies]
+tokio = { version = "1.0.0", path = "../tokio", features = ["full", "tracing", "taskdump"] }
+
 [target.'cfg(windows)'.dev-dependencies.windows-sys]
 version = "0.61"
 

examples/dump.rs

@@ -4,7 +4,6 @@
 
 #[cfg(all(
     tokio_unstable,
-    tokio_taskdump,
     target_os = "linux",
     any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64")
 ))]
@@ -82,7 +81,6 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 
 #[cfg(not(all(
     tokio_unstable,
-    tokio_taskdump,
     target_os = "linux",
     any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64")
 )))]