Rollup merge of rust-lang#101587 - BoxyUwU:term_debug, r=compiler-errors

Make `Debug` impl for `Term` useful

because `Term { ptr: 78942378998734298342, maker: PhantomData, }` does not excel at communicating the necessary information

Author: compiler-errors

compiler/rustc_middle/src/ty/mod.rs

@@ -915,12 +915,25 @@ pub struct CoercePredicate<'tcx> {
 }
 pub type PolyCoercePredicate<'tcx> = ty::Binder<'tcx, CoercePredicate<'tcx>>;
 
-#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct Term<'tcx> {
     ptr: NonZeroUsize,
     marker: PhantomData<(Ty<'tcx>, Const<'tcx>)>,
 }
 
+impl Debug for Term<'_> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let data = if let Some(ty) = self.ty() {
+            format!("Term::Ty({:?})", ty)
+        } else if let Some(ct) = self.ct() {
+            format!("Term::Ct({:?})", ct)
+        } else {
+            unreachable!()
+        };
+        f.write_str(&data)
+    }
+}
+
 impl<'tcx> From<Ty<'tcx>> for Term<'tcx> {
     fn from(ty: Ty<'tcx>) -> Self {
         TermKind::Ty(ty).pack()