Auto merge of #28178 - christopherdumas:fix_ice, r=nikomatsakis

This fixes the ICE, and makes it just a compiler error/warning. I'm not exactly sure that's whats wanted, so tell me if it isn't.

src/librustc/middle/check_const.rs

@@ -378,8 +378,8 @@ fn visit_pat(&mut self, p: &hir::Pat) {
                             "lower range bound must be less than or equal to upper");
                     }
                     None => {
-                        self.tcx.sess.span_bug(
-                            start.span, "literals of different types in range pat");
+                        self.tcx.sess.delay_span_bug(start.span,
+                                                     "non-constant path in constant expr");
                     }
                 }
             }

src/test/compile-fail/non-constant-in-const-path.rs

+// Copyright 2015 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() {
+    let x = 0;
+    match 1 {
+        0 ... x => {}
+        //~^ ERROR non-constant path in constant expr
+        //~| ERROR paths in constants may only refer to constants or functions
+    };
+}