Update bootstrap to v18

FETCH_URL

@@ -1 +1 @@
-https://github.com/downloads/sorear/niecza/niecza-v17.zip
+http://host02.appflux.net/niecza/niecza-18.zip

docs/announce.v18

@@ -62,5 +62,5 @@ this mailing.  Also check out the TODO file; whether you want to work
 on stuff on it, or have cool ideas to add to it, both are good.
 
 
-[1] https://github.com/downloads/sorear/niecza/niecza-18.zip
+[1] http://host02.appflux.net/niecza/niecza-18.zip
 [2] https://github.com/sorear/niecza

src/CompilerBlob.cs

@@ -123,7 +123,7 @@ public class Downcaller {
         }
 
         internal static Variable DCResult(object r) {
-            if (r == null) return Kernel.AnyMO.typeVar;
+            if (r == null) return Kernel.AnyP;
             else if (r is string) return Kernel.BoxAnyMO((string)r, Kernel.StrMO);
             else if (r is int) return Builtins.MakeInt((int)r);
             else if (r is bool) return ((bool)r) ? Kernel.TrueV : Kernel.FalseV;

src/NieczaFrontendSTD.pm6

@@ -187,7 +187,7 @@ method FAILGOAL ($stop, $name, $startpos) {
 method deb(*@str) { note @str }
 
 method cursor_fresh($k = self) { Q:CgOp {
-    (ns (cursor_fresh (cast cursor (@ {self})) (@ {$k})))
+    (cursor_fresh (cast cursor (@ {self})) (@ {$k}))
 } }
 method cursor_force($pos) {
     $*HIGHWATER = $pos;