From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 24 Apr 2022 11:37:32 +0000 (+0100)
Subject: Fix trace_dbg to tolerate call without any value parameters
X-Git-Tag: otter-1.1.0~465
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=038e17249b052179f2b472498d4b9962f4cf9236;p=otter.git

Fix trace_dbg to tolerate call without any value parameters

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---

diff --git a/src/utils.rs b/src/utils.rs
index f12ec31f..79cc592b 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -332,6 +332,7 @@ fn matches_doesnot_test() {
 macro_rules! trace_dbg {
   ($msg:expr $(,$val:expr)*) => {
     if log_enabled!(log::Level::Trace) {
+      #[allow(unused_mut)]
       let mut buf = format!("{}", &$msg);
       $( write!(&mut buf, " {}={:?}", stringify!($val), &$val).unwrap(); )*
       trace!("{}", buf);