prevent misleading "must specify Promise, got Promise"

by adding defined/undefined when the thing passed is a type object.
rakudo · Sep 2, 2016 · b48c62f · b48c62f
1 parent 6dab6b8
commit b48c62f
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/core/asyncops.pm b/src/core/asyncops.pm
@@ -7,7 +7,10 @@ proto sub await(|) { * }
 multi sub await() {
     die "Must specify a Promise or Channel to await on (got an empty list)";
 }
-multi sub await(Any $x) {
+multi sub await(Any:U $x) {
+    die "Must specify a defined Promise or Channel to await on (got an undefined $x.^name())";
+}
+multi sub await(Any:D $x) {
     die "Must specify a Promise or Channel to await on (got a $x.^name())";
 }
 multi sub await(Iterable:D $i) { $i.eager.map({ await $_ }) }