1 files changed, 8 insertions, 8 deletions

diff --git a/compiler/rustc_serialize/src/leb128.rs b/compiler/rustc_serialize/src/leb128.rs
index 7dad9aa01..e568b9e67 100644
--- a/compiler/rustc_serialize/src/leb128.rs
+++ b/compiler/rustc_serialize/src/leb128.rs
@@ -1,3 +1,6 @@
+use crate::opaque::MemDecoder;
+use crate::serialize::Decoder;
+
 /// Returns the length of the longest LEB128 encoding for `T`, assuming `T` is an integer type
 pub const fn max_leb128_len<T>() -> usize {
     // The longest LEB128 encoding for an integer uses 7 bits per byte.
@@ -50,21 +53,19 @@ impl_write_unsigned_leb128!(write_usize_leb128, usize);
 macro_rules! impl_read_unsigned_leb128 {
     ($fn_name:ident, $int_ty:ty) => {
         #[inline]
-        pub fn $fn_name(slice: &[u8], position: &mut usize) -> $int_ty {
+        pub fn $fn_name(decoder: &mut MemDecoder<'_>) -> $int_ty {
             // The first iteration of this loop is unpeeled. This is a
             // performance win because this code is hot and integer values less
             // than 128 are very common, typically occurring 50-80% or more of
             // the time, even for u64 and u128.
-            let byte = slice[*position];
-            *position += 1;
+            let byte = decoder.read_u8();
             if (byte & 0x80) == 0 {
                 return byte as $int_ty;
             }
             let mut result = (byte & 0x7F) as $int_ty;
             let mut shift = 7;
             loop {
-                let byte = slice[*position];
-                *position += 1;
+                let byte = decoder.read_u8();
                 if (byte & 0x80) == 0 {
                     result |= (byte as $int_ty) << shift;
                     return result;
@@ -127,14 +128,13 @@ impl_write_signed_leb128!(write_isize_leb128, isize);
 macro_rules! impl_read_signed_leb128 {
     ($fn_name:ident, $int_ty:ty) => {
         #[inline]
-        pub fn $fn_name(slice: &[u8], position: &mut usize) -> $int_ty {
+        pub fn $fn_name(decoder: &mut MemDecoder<'_>) -> $int_ty {
             let mut result = 0;
             let mut shift = 0;
             let mut byte;
 
             loop {
-                byte = slice[*position];
-                *position += 1;
+                byte = decoder.read_u8();
                 result |= <$int_ty>::from(byte & 0x7F) << shift;
                 shift += 7;