sha2 -- introduce locals to clarify which subportions are being borrowed

Author: nikomatsakis

src/librustc/util/sha2.rs

@@ -453,18 +453,20 @@ impl Engine256 {
         assert!(!self.finished)
         // Assumes that input.len() can be converted to u64 without overflow
         self.length_bits = add_bytes_to_bits(self.length_bits, input.len() as u64);
-        self.buffer.input(input, |input: &[u8]| { self.state.process_block(input) });
+        let self_state = &mut self.state;
+        self.buffer.input(input, |input: &[u8]| { self_state.process_block(input) });
     }
 
     fn finish(&mut self) {
         if self.finished {
             return;
         }
 
-        self.buffer.standard_padding(8, |input: &[u8]| { self.state.process_block(input) });
+        let self_state = &mut self.state;
+        self.buffer.standard_padding(8, |input: &[u8]| { self_state.process_block(input) });
         write_u32_be(self.buffer.next(4), (self.length_bits >> 32) as u32 );
         write_u32_be(self.buffer.next(4), self.length_bits as u32);
-        self.state.process_block(self.buffer.full_buffer());
+        self_state.process_block(self.buffer.full_buffer());
 
         self.finished = true;
     }