[naga wgsl-in] Tweak logging in front::wgsl::lower::conversion.

Author: jimblandy

naga/src/front/wgsl/lower/conversion.rs

@@ -314,11 +314,12 @@ impl<'source> super::ExpressionContext<'source, '_, '_> {
             .into_iter()
             .map(|&c| self.typifier()[c].inner_with(types));
         log::debug!(
-            "wgsl automatic_conversion_consensus: {:?}",
+            "wgsl automatic_conversion_consensus: {}",
             inners
                 .clone()
                 .map(|inner| inner.to_wgsl_for_error(&self.module.to_ctx()))
                 .collect::<Vec<String>>()
+                .join(", ")
         );
         let mut best = inners.next().unwrap().scalar().ok_or(0_usize)?;
         for (inner, i) in inners.zip(1..) {
@@ -331,7 +332,7 @@ impl<'source> super::ExpressionContext<'source, '_, '_> {
             }
         }
 
-        log::debug!("    consensus: {:?}", best.to_wgsl_for_error());
+        log::debug!("    consensus: {}", best.to_wgsl_for_error());
         Ok(best)
     }
 }