openpgp: Allow tracer to be used just for tracing.

  - The `tracer` macro declares a local macro, `t`, that can be used
    to show additional tracing information.

  - It is useful to just show that a function has been entered.

  - Don't require that `t` be used.

1 files changed, 1 insertions, 0 deletions

diff --git a/openpgp/src/macros.rs b/openpgp/src/macros.rs
index 11f334d0..8a84f3bb 100644
--- a/openpgp/src/macros.rs
+++ b/openpgp/src/macros.rs
@@ -26,6 +26,7 @@ macro_rules! tracer {
         // Currently, Rust doesn't support $( ... ) in a nested
         // macro's definition.  See:
         // https://users.rust-lang.org/t/nested-macros-issue/8348/2
+        #[allow(unused_macros)]
         macro_rules! t {
             ( $fmt:expr ) =>
             { trace!($TRACE, "{}{}: {}", crate::macros::indent($indent), $func, $fmt) };