attributes: add skip_all (tokio-rs#1548)

Using `#[instrument(skip_all)]` is equivalent to `#[instrument(skip(foo,
bar..))]` for all the parameters.

tracing-attributes/src/lib.rs

@@ -161,8 +161,8 @@ mod expand;
 /// }
 /// ```
 ///
-/// This can be used in conjunction with `skip` to record only some fields of a
-/// struct:
+/// This can be used in conjunction with `skip` or `skip_all` to record only
+/// some fields of a struct:
 /// ```
 /// # use tracing_attributes::instrument;
 /// // Remember the struct with the very large `data` field from the earlier

tracing-attributes/tests/instrument.rs

@@ -137,6 +137,7 @@ fn skip() {
     with_default(collector, || {
         my_fn(2, UnDebug(0), UnDebug(1));
         my_fn(3, UnDebug(0), UnDebug(1));
+        my_fn2(2, UnDebug(0), UnDebug(1));
     });
 
     handle.assert_finished();