Merging upstream version 1.67.1+dfsg1.

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

1 files changed, 26 insertions, 0 deletions

diff --git a/compiler/rustc_macros/src/newtype.rs b/compiler/rustc_macros/src/newtype.rs
index 0a77b734c..fd3f52251 100644
--- a/compiler/rustc_macros/src/newtype.rs
+++ b/compiler/rustc_macros/src/newtype.rs
@@ -192,6 +192,30 @@ impl Parse for Newtype {
                 }
             }
         };
+        let spec_partial_eq_impl = if let Lit::Int(max) = &max {
+            if let Ok(max_val) = max.base10_parse::<u32>() {
+                quote! {
+                    impl core::option::SpecOptionPartialEq for #name {
+                        #[inline]
+                        fn eq(l: &Option<Self>, r: &Option<Self>) -> bool {
+                            if #max_val < u32::MAX {
+                                l.map(|i| i.private).unwrap_or(#max_val+1) == r.map(|i| i.private).unwrap_or(#max_val+1)
+                            } else {
+                                match (l, r) {
+                                    (Some(l), Some(r)) => r == l,
+                                    (None, None) => true,
+                                    _ => false
+                                }
+                            }
+                        }
+                    }
+                }
+            } else {
+                quote! {}
+            }
+        } else {
+            quote! {}
+        };
 
         Ok(Self(quote! {
             #(#attrs)*
@@ -293,6 +317,8 @@ impl Parse for Newtype {
 
             #step
 
+            #spec_partial_eq_impl
+
             impl From<#name> for u32 {
                 #[inline]
                 fn from(v: #name) -> u32 {