Add math::@ceil() compile time ceil function. #2134

lib/std/math/math.c3

@@ -234,6 +234,13 @@ macro asinh(x)
 *>
 macro ceil(x) => $$ceil(x);
 
+<*
+ Ceil for compile time evaluation.
+
+ @require @typeis($input, double) || @typeis($input, float) : "Only float and double may be used"
+*>
+macro @ceil($input) @const => $$ceil($input);
+
 <*
  Constrain the value to lie within the given interval.