Merge pull request #75 from vorner/warn-unused-observe-when

Use must_use on the ObserveWhen
2019-07-12 09:58:11 -04:00 · 2019-07-12 09:58:11 -04:00 · 1f656fc62e
parent 787874fee4 ea96d5c6a0
commit 1f656fc62e
1 changed files with 1 additions and 0 deletions
--- a/src/core/attributes.rs
+++ b/src/core/attributes.rs
@ -198,6 +198,7 @@ pub trait Observe {
    /// common.
    type Inner;
    /// Provide a source for a metric's values.
+    #[must_use = "must specify when to observe"]
    fn observe<F>(
        &self,
        metric: impl Deref<Target = InputMetric>,