From affa2f904059fd8730b9f69f8de5ca0117508b66 Mon Sep 17 00:00:00 2001
From: Trevor Gross <tmgross@umich.edu>
Date: Sat, 29 Jun 2024 16:14:34 -0400
Subject: [PATCH] Print `TypeId` as a `u128` for `Debug`

Since <https://github.com/rust-lang/rust/pull/121358>, `TypeId` is
represented as a `(u64, u64)`. This also made the debug implementation a
lot larger, which is especially apparent with pretty formatting.

Make this less noisy by converting the inner value back to a `u128` then
printing as a tuple struct.

Current:

    TypeId { t: (1403077013027291752, 4518903163082958039) }
    TypeId {
        t: (
            1403077013027291752,
            4518903163082958039,
        ),
    }

New:

    TypeId(25882202575019293479932656973818029271)
    TypeId(
        25882202575019293479932656973818029271,
    )
---
 core/src/any.rs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/core/src/any.rs b/core/src/any.rs
index 37cb8e7d303af..eab11ae288a95 100644
--- a/core/src/any.rs
+++ b/core/src/any.rs
@@ -602,7 +602,7 @@ impl dyn Any + Send + Sync {
 /// While `TypeId` implements `Hash`, `PartialOrd`, and `Ord`, it is worth
 /// noting that the hashes and ordering will vary between Rust releases. Beware
 /// of relying on them inside of your code!
-#[derive(Clone, Copy, Debug, Eq, PartialOrd, Ord)]
+#[derive(Clone, Copy, Eq, PartialOrd, Ord)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct TypeId {
     // We avoid using `u128` because that imposes higher alignment requirements on many platforms.
@@ -644,6 +644,10 @@ impl TypeId {
         let t2 = t as u64;
         TypeId { t: (t1, t2) }
     }
+
+    fn as_u128(self) -> u128 {
+        u128::from(self.t.0) << 64 | u128::from(self.t.1)
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
@@ -666,6 +670,13 @@ impl hash::Hash for TypeId {
     }
 }
 
+#[stable(feature = "rust1", since = "1.0.0")]
+impl fmt::Debug for TypeId {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
+        f.debug_tuple("TypeId").field(&self.as_u128()).finish()
+    }
+}
+
 /// Returns the name of a type as a string slice.
 ///
 /// # Note