tracing: make flag checking less noisy

Author: oli-obk

compiler/rustc_middle/src/ty/visit.rs

@@ -88,9 +88,11 @@ pub trait TypeVisitable<'tcx>: fmt::Debug + Clone {
         self.has_vars_bound_at_or_above(ty::INNERMOST)
     }
 
-    #[instrument(level = "trace", ret)]
     fn has_type_flags(&self, flags: TypeFlags) -> bool {
-        self.visit_with(&mut HasTypeFlagsVisitor { flags }).break_value() == Some(FoundFlags)
+        let res =
+            self.visit_with(&mut HasTypeFlagsVisitor { flags }).break_value() == Some(FoundFlags);
+        trace!(?self, ?flags, ?res, "has_type_flags");
+        res
     }
     fn has_projections(&self) -> bool {
         self.has_type_flags(TypeFlags::HAS_PROJECTION)
@@ -560,10 +562,8 @@ impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
     type BreakTy = FoundFlags;
 
     #[inline]
-    #[instrument(skip(self), level = "trace", ret)]
     fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
         let flags = t.flags();
-        trace!(t.flags=?t.flags());
         if flags.intersects(self.flags) {
             ControlFlow::Break(FoundFlags)
         } else {
@@ -572,10 +572,8 @@ impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
     }
 
     #[inline]
-    #[instrument(skip(self), level = "trace", ret)]
     fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
         let flags = r.type_flags();
-        trace!(r.flags=?flags);
         if flags.intersects(self.flags) {
             ControlFlow::Break(FoundFlags)
         } else {
@@ -584,7 +582,6 @@ impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
     }
 
     #[inline]
-    #[instrument(level = "trace", ret)]
     fn visit_const(&mut self, c: ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
         let flags = FlagComputation::for_const(c);
         trace!(r.flags=?flags);
@@ -596,14 +593,7 @@ impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
     }
 
     #[inline]
-    #[instrument(level = "trace", ret)]
     fn visit_predicate(&mut self, predicate: ty::Predicate<'tcx>) -> ControlFlow<Self::BreakTy> {
-        debug!(
-            "HasTypeFlagsVisitor: predicate={:?} predicate.flags={:?} self.flags={:?}",
-            predicate,
-            predicate.flags(),
-            self.flags
-        );
         if predicate.flags().intersects(self.flags) {
             ControlFlow::Break(FoundFlags)
         } else {