From @usev6

Currently the following test files under S03-operators do not run
to completion on the JVM backend​:

  S03-operators/set_addition.t aborted 513 test(s)
  S03-operators/set_difference.t aborted 2 test(s)
  S03-operators/set_multiply.t aborted 513 test(s)
  S03-operators/set_proper_subset.t aborted 2 test(s)
  S03-operators/set_subset.t aborted 2 test(s)
  S03-operators/set_symmetric_difference.t aborted 2 test(s)
  S03-operators/set_union.t aborted 404 test(s)

I tried to golf the failures from set_addition.t and found the
following​:

  $ ./perl6-j --ll-exception -e '&infix​:<(+)>(SetHash.new, SetHash.new, SetHash.new); &infix​:<(+)>(|(Set.new, Set.new, Set.new)); &infix​:<(+)>(|(Set.new, Set.new, Set.new)); &infix​:<(+)>(|(Set.new, Set.new, Set.new));'
  Too many positionals passed; expected 2 arguments but got 3
  in infix​:<(+)> (gen/jvm/CORE.setting​:48959)
  in infix​:<(+)> (gen/jvm/CORE.setting​:48952)
  in <unit> (-e​:1)
  in <unit-outer> (-e​:1)
  in eval (gen/jvm/stage2/NQPHLL.nqp​:1181)
  in <anon> (gen/jvm/stage2/NQPHLL.nqp​:1288)
  in command_eval (gen/jvm/stage2/NQPHLL.nqp​:1285)
  in command_eval (src/Perl6/Compiler.nqp​:42)
  in command_line (gen/jvm/stage2/NQPHLL.nqp​:1269)
  in MAIN (gen/jvm/main.nqp​:47)
  in <mainline> (gen/jvm/main.nqp​:38)
  in <anon> (gen/jvm/main.nqp)

  $ ./perl6-j --version
  This is Rakudo version 2017.11-38-g1668b4f0b built on JVM
  implementing Perl 6.c.

For some reasons the fourth statement calls a multi sub
of &infix​:<(+)> with two parameters​: https://github.com/rakudo/rakudo/blob/e7c0a644753705891bf340ae6dc6e4f0cc63ddee/src/core/set_addition.pm#L12

I've run the above code on an older commit (4efcc29c80, 2017-02-06)
and there was no error.

From @usev6

On Tue, 28 Nov 2017 12​:35​:42 -0800, bartolin@​gmx.de wrote​:

[...]
I tried to golf the failures from set_addition.t and found the
following​:

$ ./perl6-j --ll-exception -e '&infix​:<(+)>(SetHash.new, SetHash.new,
SetHash.new); &infix​:<(+)>(|(Set.new, Set.new, Set.new));
&infix​:<(+)>(|(Set.new, Set.new, Set.new)); &infix​:<(+)>(|(Set.new,
Set.new, Set.new));'
Too many positionals passed; expected 2 arguments but got 3

I was able to golf it further​:

$ ./perl6-j --ll-exception -e 'multi sub f($) {}; multi sub f($,$) { f(Any.new); f(Any.new); f(Any.new) }; f(Int.new,Int.new); say "alive"; f(Any.new,Any.new);'
alive
Too many positionals passed; expected 1 arguments but got 2
  in f (-e​:1)
  in f (-e)
  in <unit> (-e​:1)
  in <unit-outer> (-e​:1)
  in eval (gen/jvm/stage2/NQPHLL.nqp​:1181)
  in <anon> (gen/jvm/stage2/NQPHLL.nqp​:1288)
  in command_eval (gen/jvm/stage2/NQPHLL.nqp​:1285)
  in command_eval (src/Perl6/Compiler.nqp​:42)
  in command_line (gen/jvm/stage2/NQPHLL.nqp​:1269)
  in MAIN (gen/jvm/main.nqp​:47)
  in <mainline> (gen/jvm/main.nqp​:38)
  in <anon> (gen/jvm/main.nqp)

All occurences of 'Any' can be replaced with another type -- as long as it's different from Int. Similarly one can replace Int with another type and still get the same error.

From @usev6

There was indeed something wrong with the multi cache on the JVM backend. Fixed with Raku/nqp@7eaebf5abd

I'm closing this ticket as 'resolved'.

@usev6 - Status changed from 'new' to 'resolved'