Merging upstream version 1.69.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

2 files changed, 1 insertions, 18 deletions

diff --git a/compiler/rustc_serialize/Cargo.toml b/compiler/rustc_serialize/Cargo.toml
index db0ef7354..c04465719 100644
--- a/compiler/rustc_serialize/Cargo.toml
+++ b/compiler/rustc_serialize/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2021"
 [dependencies]
 indexmap = "1.9.1"
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
-thin-vec = "0.2.9"
+thin-vec = "0.2.12"
 
 [dev-dependencies]
 rustc_macros = { path = "../rustc_macros" }
diff --git a/compiler/rustc_serialize/src/serialize.rs b/compiler/rustc_serialize/src/serialize.rs
index 751b209f1..567fe0610 100644
--- a/compiler/rustc_serialize/src/serialize.rs
+++ b/compiler/rustc_serialize/src/serialize.rs
@@ -43,7 +43,6 @@ pub trait Encoder {
     fn emit_str(&mut self, v: &str);
     fn emit_raw_bytes(&mut self, s: &[u8]);
 
-    // Convenience for the derive macro:
     fn emit_enum_variant<F>(&mut self, v_id: usize, f: F)
     where
         F: FnOnce(&mut Self),
@@ -51,17 +50,6 @@ pub trait Encoder {
         self.emit_usize(v_id);
         f(self);
     }
-
-    // We put the field index in a const generic to allow the emit_usize to be
-    // compiled into a more efficient form. In practice, the variant index is
-    // known at compile-time, and that knowledge allows much more efficient
-    // codegen than we'd otherwise get. LLVM isn't always able to make the
-    // optimization that would otherwise be necessary here, likely due to the
-    // multiple levels of inlining and const-prop that are needed.
-    #[inline]
-    fn emit_fieldless_enum_variant<const ID: usize>(&mut self) {
-        self.emit_usize(ID)
-    }
 }
 
 // Note: all the methods in this trait are infallible, which may be surprising.
@@ -430,11 +418,6 @@ impl<D: Decoder, T: Decodable<D> + Copy> Decodable<D> for Cell<T> {
     }
 }
 
-// FIXME: #15036
-// Should use `try_borrow`, returning an
-// `encoder.error("attempting to Encode borrowed RefCell")`
-// from `encode` when `try_borrow` returns `None`.
-
 impl<S: Encoder, T: Encodable<S>> Encodable<S> for RefCell<T> {
     fn encode(&self, s: &mut S) {
         self.borrow().encode(s);