From @zoffixznet

Unsure if this is on purpose or not​:

If I have a variable with a Failure in it and I let it be the last statement of a sub, so it's returned, and I call the sub and let its return sink, the failure explodes​:

$ perl6 -e 'sub wone { fail }; sub two { my $x = wone; $x }(); say "all good"'
Failed
  in sub wone at -e line 1
  in sub two at -e line 1
  in block <unit> at -e line 1

Actually thrown at​:
  in block <unit> at -e line 1

BUT, if I use an explicit `return`, the explosion no longer happens​:

$ perl6 -e 'sub wone { fail }; sub two { my $x = wone; return $x }(); say "all good"'
all good

From @zoffixznet

Related Issue​: rakudo/rakudo#1360