Test IO::Path.extension with excluded Range as parts

Rakudo fix: rakudo/rakudo@8efffb1d13

Author: zoffixznet

S32-io/io-path-extension.t

@@ -20,9 +20,14 @@ my @tests = gather {
             \(       :parts(0..3)            ) => 'txt.tar.gz',
             \(       :parts(0..9)            ) => 'txt.tar.gz',
             \(       :parts(0..∞)            ) => 'txt.tar.gz',
+            \(       :parts(  ^∞)            ) => 'txt.tar.gz',
+            \(       :parts(1^..^3)          ) => 'tar.gz',
+            \(       :parts(1^..*)           ) => 'txt.tar.gz',
             \(       :parts(0..*)            ) => 'txt.tar.gz',
             \(       :4parts                 ) => '',
             \(       :parts(4..4)            ) => '',
+            \(       :parts(3^..4)           ) => '',
+            \(       :parts(2^..4)           ) => 'txt.tar.gz',
             \(       :parts(0..4)            ) => 'txt.tar.gz',
             \(       :0parts                 ) => '',
             \(       :parts(0..0)            ) => '',