From anteusz@freemail.hu

Hi,
Compile this and you get and error message

===SORRY!=== Error while compiling D​:\m\p6\perltidy\bug2.p6
Placeholder variable @​_ may not be used here because the surrounding
block takes no signature

sub dump_array {

  say "({join ')(',@​_})\n";
}

Compile this and you do not

sub dump_array {
  my @​d = @​_;
  say "({join ')(',@​d})\n";
}

Marton

From @FROGGS

Yes, that is a bug.

Rakudo believes that an interpolated block in a string is like a "real" block in code.
So it thinks that the @​_ was meant for the block in the string rather than the block the string is in.

The RT System itself - Status changed from 'new' to 'open'

From @moritz

On Thu Jun 25 05​:17​:47 2015, FROGGS.de wrote​:

Yes, that is a bug.

Rakudo believes that an interpolated block in a string is like a
"real" block in code.
So it thinks that the @​_ was meant for the block in the string rather
than the block the string is in.

I'd argue that Rakudo behaves correctly here, and STD.pm6 agrees too.
I see no indication that blocks inside a string are supposed to be any less "real" than blocks outside of strings.

What we observe here is the danger of implicit declarations​: They stop working for non-trivial cases. Your proper formal parameters for anything more involved.

Cheers,
Moritz

@moritz - Status changed from 'open' to 'rejected'