a simple refactoring and removing comment.

kenta7777 · kenta7777 · commit a8fa1a153d33 · 2019-03-16T01:58:48.000+09:00
diff --git a/src/librustc_mir/hair/pattern/_match.rs b/src/librustc_mir/hair/pattern/_match.rs
@@ -678,10 +678,9 @@ fn all_constructors<'a, 'tcx: 'a>(cx: &mut MatchCheckCtxt<'a, 'tcx>,
             ]
         }
         ty::Int(ity) => {
-            // FIXME(49937): refactor these bit manipulations into interpret.
             let bits = Integer::from_attr(&cx.tcx, SignedInt(ity)).size().bits() as u128;
             let min = 1u128 << (bits - 1);
-            let max = (1u128 << (bits - 1)) - 1;
+            let max = min - 1;
             vec![ConstantRange(min, max, pcx.ty, RangeEnd::Included)]
         }
         ty::Uint(uty) => {

Original file line number	Diff line number	Diff line change
`@@ -678,10 +678,9 @@ fn all_constructors<'a, 'tcx: 'a>(cx: &mut MatchCheckCtxt<'a, 'tcx>,`
`678`	`678`	`]`
`679`	`679`	`}`
`680`	`680`	`ty::Int(ity) => {`
`681`		`- // FIXME(49937): refactor these bit manipulations into interpret.`
`682`	`681`	`let bits = Integer::from_attr(&cx.tcx, SignedInt(ity)).size().bits() as u128;`
`683`	`682`	`let min = 1u128 << (bits - 1);`
`684`		`- let max = (1u128 << (bits - 1)) - 1;`
	`683`	`+ let max = min - 1;`
`685`	`684`	`vec![ConstantRange(min, max, pcx.ty, RangeEnd::Included)]`
`686`	`685`	`}`
`687`	`686`	`ty::Uint(uty) => {`