diff --git a/src/librustc_data_structures/stable_hasher.rs b/src/librustc_data_structures/stable_hasher.rs
index fa573907d4c..13e245d3c01 100644
--- a/src/librustc_data_structures/stable_hasher.rs
+++ b/src/librustc_data_structures/stable_hasher.rs
@@ -15,7 +15,6 @@ use crate::bit_set;
 /// extended to 64 bits if needed.
 pub struct StableHasher<W> {
     state: SipHasher128,
-    bytes_hashed: u64,
     width: PhantomData<W>,
 }
 
@@ -33,7 +32,6 @@ impl<W: StableHasherResult> StableHasher<W> {
     pub fn new() -> Self {
         StableHasher {
             state: SipHasher128::new_with_keys(0, 0),
-            bytes_hashed: 0,
             width: PhantomData,
         }
     }
@@ -61,11 +59,6 @@ impl<W> StableHasher<W> {
     pub fn finalize(self) -> (u64, u64) {
         self.state.finish128()
     }
-
-    #[inline]
-    pub fn bytes_hashed(&self) -> u64 {
-        self.bytes_hashed
-    }
 }
 
 impl<W> Hasher for StableHasher<W> {
@@ -76,37 +69,31 @@ impl<W> Hasher for StableHasher<W> {
     #[inline]
     fn write(&mut self, bytes: &[u8]) {
         self.state.write(bytes);
-        self.bytes_hashed += bytes.len() as u64;
     }
 
     #[inline]
     fn write_u8(&mut self, i: u8) {
         self.state.write_u8(i);
-        self.bytes_hashed += 1;
     }
 
     #[inline]
     fn write_u16(&mut self, i: u16) {
         self.state.write_u16(i.to_le());
-        self.bytes_hashed += 2;
     }
 
     #[inline]
     fn write_u32(&mut self, i: u32) {
         self.state.write_u32(i.to_le());
-        self.bytes_hashed += 4;
     }
 
     #[inline]
     fn write_u64(&mut self, i: u64) {
         self.state.write_u64(i.to_le());
-        self.bytes_hashed += 8;
     }
 
     #[inline]
     fn write_u128(&mut self, i: u128) {
         self.state.write_u128(i.to_le());
-        self.bytes_hashed += 16;
     }
 
     #[inline]
@@ -115,37 +102,31 @@ impl<W> Hasher for StableHasher<W> {
         // platforms. This is important for symbol hashes when cross compiling,
         // for example.
         self.state.write_u64((i as u64).to_le());
-        self.bytes_hashed += 8;
     }
 
     #[inline]
     fn write_i8(&mut self, i: i8) {
         self.state.write_i8(i);
-        self.bytes_hashed += 1;
     }
 
     #[inline]
     fn write_i16(&mut self, i: i16) {
         self.state.write_i16(i.to_le());
-        self.bytes_hashed += 2;
     }
 
     #[inline]
     fn write_i32(&mut self, i: i32) {
         self.state.write_i32(i.to_le());
-        self.bytes_hashed += 4;
     }
 
     #[inline]
     fn write_i64(&mut self, i: i64) {
         self.state.write_i64(i.to_le());
-        self.bytes_hashed += 8;
     }
 
     #[inline]
     fn write_i128(&mut self, i: i128) {
         self.state.write_i128(i.to_le());
-        self.bytes_hashed += 16;
     }
 
     #[inline]
@@ -154,7 +135,6 @@ impl<W> Hasher for StableHasher<W> {
         // platforms. This is important for symbol hashes when cross compiling,
         // for example.
         self.state.write_i64((i as i64).to_le());
-        self.bytes_hashed += 8;
     }
 }