Also debug

compiler/rustc_middle/src/ty/print/mod.rs

@@ -350,4 +350,8 @@ fn print(t: &T, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
             Ok(())
         })
     }
+
+    fn print_debug(t: &T, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        with_no_trimmed_paths!(Self::print(t, fmt))
+    }
 }

compiler/rustc_type_ir/src/ir_print.rs

@@ -4,6 +4,7 @@
 
 pub trait IrPrint<T> {
     fn print(t: &T, fmt: &mut fmt::Formatter<'_>) -> fmt::Result;
+    fn print_debug(t: &T, fmt: &mut fmt::Formatter<'_>) -> fmt::Result;
 }
 
 macro_rules! define_display_via_print {
@@ -14,6 +15,12 @@ fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
                     <I as IrPrint<$ty<I>>>::print(self, fmt)
                 }
             }
+
+            impl<I: Interner> fmt::Debug for $ty<I> {
+                fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+                    <I as IrPrint<$ty<I>>>::print_debug(self, fmt)
+                }
+            }
         )*
     }
 }

compiler/rustc_type_ir/src/trait_ref.rs

@@ -1,5 +1,3 @@
-use std::fmt;
-
 use rustc_macros::{HashStable_NoContext, TyDecodable, TyEncodable};
 
 use crate::fold::{FallibleTypeFolder, TypeFoldable};
@@ -71,25 +69,6 @@ pub fn self_ty(&self) -> I::Ty {
     }
 }
 
-impl<I: Interner> fmt::Debug for TraitRef<I> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let TraitRef { def_id, args, _use_trait_ref_new_instead: () } = self;
-        let mut args = args.into_iter().peekable();
-        write!(f, "{def_id:?}")?;
-        if args.peek().is_some() {
-            write!(f, "<")?;
-            for (i, arg) in args.enumerate() {
-                if i > 0 {
-                    write!(f, ", ")?;
-                }
-                write!(f, "{arg:#?}")?;
-            }
-            write!(f, ">")?;
-        }
-        Ok(())
-    }
-}
-
 // FIXME(compiler-errors): Make this into a `Lift_Generic` impl.
 impl<I: Interner, U: Interner> Lift<U> for TraitRef<I>
 where