Unfortunately commit 8d35951 breaks the build on JVM. It dies during stage parse with
Error while compiling, type X::Parameter::InvalidType suggestions: () typename: Uni at line 32953, near " $uni) { " in panic (gen/jvm/stage2/NQPHLL.nqp:348) [...] Type Uni is not usable with rakudo-j: $ perl6-j -e 'my Uni $foo' ===SORRY!=== Type 'Uni' is not declared at -e:1 ------> my Uni⏏ $foo Malformed my at -e:1 ------> my⏏ Uni $foo I'd suggest to add a special case for jvm, so that fix from commit 8d35951 is not applied there. I opened a PR for that: https://github.com/rakudo/rakudo/pull/980