add tests

tracing-attributes/tests/instrument.rs

@@ -12,6 +12,40 @@ fn repro_2294() {
     let i = 42;
 }
 
+// Reproduces a compile error when an instrumented function signature contains lifetimes
+// (https://github.com/tokio-rs/tracing/issues/2796).
+#[derive(Debug)]
+struct Repro2796(u8);
+impl Repro2796 {
+    #[instrument(err)]
+    fn err(x: &mut u8) -> Result<&u8, &u8> {
+        Ok(&*x)
+    }
+    #[instrument(ret)]
+    fn ret(x: &mut u8) -> Result<&u8, &u8> {
+        Ok(&*x)
+    }
+    #[instrument(err, ret)]
+    fn err_ret(x: &mut u8) -> Result<&u8, &u8> {
+        Ok(&*x)
+    }
+
+    #[instrument(err, ret)]
+    fn receiver(&mut self) -> Result<&u8, &u8> {
+        Ok(&self.0)
+    }
+
+    #[instrument(err, ret)]
+    fn multiple<'a, 'b, 'c, 'd>(
+        x: &'a mut u8,
+        (y, _): (&'b mut u8, u8),
+        Repro2796(z, ..): &'c mut Repro2796,
+        _: &'d mut u8,
+    ) -> Result<&'a u8, &'b u8> {
+        Ok(&*x)
+    }
+}
+
 #[test]
 fn override_everything() {
     #[instrument(target = "my_target", level = "debug")]