Use `T::BITS` instead of `size_of::<T> * 8`.

2 files changed, 3 insertions, 2 deletions

diff --git a/library/panic_unwind/src/dwarf/mod.rs b/library/panic_unwind/src/dwarf/mod.rs
index 649bbce52a3..652fbe95a14 100644
--- a/library/panic_unwind/src/dwarf/mod.rs
+++ b/library/panic_unwind/src/dwarf/mod.rs
@@ -53,7 +53,7 @@ impl DwarfReader {
     }
 
     pub unsafe fn read_sleb128(&mut self) -> i64 {
-        let mut shift: usize = 0;
+        let mut shift: u32 = 0;
         let mut result: u64 = 0;
         let mut byte: u8;
         loop {
@@ -65,7 +65,7 @@ impl DwarfReader {
             }
         }
         // sign-extend
-        if shift < 8 * mem::size_of::<u64>() && (byte & 0x40) != 0 {
+        if shift < u64::BITS && (byte & 0x40) != 0 {
             result |= (!0 as u64) << shift;
         }
         result as i64
diff --git a/library/panic_unwind/src/lib.rs b/library/panic_unwind/src/lib.rs
index 6f31e6dcae7..162f0386b66 100644
--- a/library/panic_unwind/src/lib.rs
+++ b/library/panic_unwind/src/lib.rs
@@ -18,6 +18,7 @@
     issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/"
 )]
 #![feature(core_intrinsics)]
+#![feature(int_bits_const)]
 #![feature(lang_items)]
 #![feature(libc)]
 #![feature(nll)]