Spec WhateverCode.assuming

Covers R#1735: rakudo/rakudo#1735
Rakudo fix: rakudo/rakudo@6e8dc6f132

S02-types/whatever.t

@@ -5,7 +5,7 @@ use lib $?FILE.IO.parent(2).add("packages");
 use Test;
 use Test::Util;
 
-plan 128;
+plan 129;
 
 # L<S02/The Whatever Object/"The * character as a standalone term captures the notion of">
 # L<S02/Native types/"If any native type is explicitly initialized to">
@@ -499,4 +499,13 @@ subtest 'can curry chains with .& calls on them' => {
       'FOOonetwO', 'method, .&(2args), method, .& with whatever curry, .&sub';
 }
 
+subtest 'can .assuming with WhateverCode' => {
+    plan 4;
+    is-deeply ((*.flip)).assuming(42)(), '24', '1-param, 1 assumed';
+    is-deeply ((* + *)).assuming(42)(3), 45, '2-param, 1 assumed';
+    is-deeply ((* + *)).assuming(42, 5)(), 47, '2-param, 2 assumed';
+    is-deeply ((* + * + *.flip + *.abs)).assuming(42, 5)(123, -50), 418,
+        '5-params with nested calls, 2 assumed';
+}
+
 # vim: ft=perl6