From 57dc64ea32b21f309bd50b9a9ecf8757a6842117 Mon Sep 17 00:00:00 2001
From: Deadbeef <ent3rm4n@gmail.com>
Date: Sat, 9 Aug 2025 00:02:09 +0800
Subject: [PATCH] remove some unused private trait impls

---
 .../rustc_borrowck/src/polonius/legacy/facts.rs  | 16 ----------------
 compiler/rustc_symbol_mangling/src/export.rs     |  9 +--------
 2 files changed, 1 insertion(+), 24 deletions(-)

diff --git a/compiler/rustc_borrowck/src/polonius/legacy/facts.rs b/compiler/rustc_borrowck/src/polonius/legacy/facts.rs
index 64389b11a651a..1f8177477e68b 100644
--- a/compiler/rustc_borrowck/src/polonius/legacy/facts.rs
+++ b/compiler/rustc_borrowck/src/polonius/legacy/facts.rs
@@ -184,22 +184,6 @@ where
     }
 }
 
-impl<A, B, C, D> FactRow for (A, B, C, D)
-where
-    A: FactCell,
-    B: FactCell,
-    C: FactCell,
-    D: FactCell,
-{
-    fn write(
-        &self,
-        out: &mut dyn Write,
-        location_table: &PoloniusLocationTable,
-    ) -> Result<(), Box<dyn Error>> {
-        write_row(out, location_table, &[&self.0, &self.1, &self.2, &self.3])
-    }
-}
-
 fn write_row(
     out: &mut dyn Write,
     location_table: &PoloniusLocationTable,
diff --git a/compiler/rustc_symbol_mangling/src/export.rs b/compiler/rustc_symbol_mangling/src/export.rs
index 956c996326bf9..76ac82cf95a12 100644
--- a/compiler/rustc_symbol_mangling/src/export.rs
+++ b/compiler/rustc_symbol_mangling/src/export.rs
@@ -21,7 +21,7 @@ macro_rules! default_hash_impl {
     };
 }
 
-default_hash_impl! { i8, i16, i32, i64, i128, isize, u8, u16, u32, u64, u128, usize, }
+default_hash_impl! { u8, u64, usize, }
 
 impl<'tcx> AbiHashStable<'tcx> for bool {
     #[inline]
@@ -37,13 +37,6 @@ impl<'tcx> AbiHashStable<'tcx> for str {
     }
 }
 
-impl<'tcx> AbiHashStable<'tcx> for String {
-    #[inline]
-    fn abi_hash(&self, tcx: TyCtxt<'tcx>, hasher: &mut StableHasher) {
-        self[..].abi_hash(tcx, hasher);
-    }
-}
-
 impl<'tcx> AbiHashStable<'tcx> for Symbol {
     #[inline]
     fn abi_hash(&self, tcx: TyCtxt<'tcx>, hasher: &mut StableHasher) {