$elif deprecated.

lib/std/math/math.c3

@@ -407,13 +407,14 @@ macro sqrt(x) => $$sqrt(values::promote_int(x));
 macro tan(x)
 {
 	var $Type = $typeof(x);
-	$if (types::is_vector($Type))
+$switch
+	$case types::is_vector($Type):
 		return $$sin(x) / $$cos(x);
-	$elif ($Type.typeid == float.typeid)
+	$case $Type.typeid == float.typeid:
 		return _tanf(x);
-	$else
+	$default:
 		return _tan(x);
-	$endif
+$endswitch
 }
 
 /**