From @usev6

With rakudo commit b1c444f062 the following test started to fail in S03-metaops/reduce.t​:

is ([&&] 1,|(2,3,4)), 4;

The error message (with --ll-exception) is​:

Type check failed in binding to &b; expected Callable but got Int (2)
  in throw (gen/jvm/CORE.setting​:23969)
  in (gen/jvm/CORE.setting​:26240)
  in infix​:<&&> (gen/jvm/CORE.setting​:10104)
  in infix​:<&&> (gen/jvm/CORE.setting​:10102)
  in (gen/jvm/CORE.setting​:34100)
  in (t/spec/S03-metaops/reduce.rakudo.jvm​:689)
  in <unit> (t/spec/S03-metaops/reduce.rakudo.jvm​:687)
  in <unit-outer> (t/spec/S03-metaops/reduce.rakudo.jvm​:1)
  in eval (gen/jvm/stage2/NQPHLL.nqp​:1201)
  in evalfiles (gen/jvm/stage2/NQPHLL.nqp​:1404)
  in command_eval (gen/jvm/stage2/NQPHLL.nqp​:1298)
  in command_eval (src/Perl6/Compiler.nqp​:27)
  in command_line (gen/jvm/stage2/NQPHLL.nqp​:1272)
  in MAIN (gen/jvm/main.nqp​:47)
  in <mainline> (gen/jvm/main.nqp​:38)
  in (gen/jvm/main.nqp)

The error does not happen when the code (or test) in question is run stand alone​:

$ ./perl6-j -Ilib -e 'use Test; is ([&&] 1,|(2,3,4)), 4'
ok 1 -

It looks like the wrong multi sub infix​:<&&> is selected. The backtrace points to this line (from src/core/Bool.pm)​:

multi sub infix​:<&&>(Mu \a, &b) { a && b() }

Please note​: This is not the first time rakudo-j gets confused about multi sub selection​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=128580

I'm going to fudge (skip) the test in question.

From @usev6

There was 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'