Work around a borrow surviving too long (fixes #37686)

Author: nox

src/librustc_const_eval/pattern.rs

@@ -223,7 +223,8 @@ impl<'a, 'gcx, 'tcx> PatternContext<'a, 'gcx, 'tcx> {
             }
 
             PatKind::Tuple(ref subpatterns, ddpos) => {
-                match self.tcx.tables().node_id_to_type(pat.id).sty {
+                let ty = self.tcx.tables().node_id_to_type(pat.id);
+                match ty.sty {
                     ty::TyTuple(ref tys) => {
                         let subpatterns =
                             subpatterns.iter()

src/test/run-pass/issue-37686.rs

@@ -0,0 +1,16 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn main() {
+    match (0, 0) {
+        (std::usize::MIN, std::usize::MAX) => {}
+        _ => {}
+    }
+}