Merge pull request #4587 from sanxiyn/divide-by-zero

Handle divide by zero in constant evaluator

src/test/compile-fail/eval-enum.rs

@@ -0,0 +1,6 @@
+enum test {
+    div_zero = 1/0, //~ERROR expected constant: divide by zero
+    rem_zero = 1%0  //~ERROR expected constant: modulo zero
+}
+
+fn main() {}