Should be fixed in https://github.com/rakudo/rakudo/commit/5747bc7121

Testneeded. Slightly relevant tests here:
https://github.com/perl6/roast/commit/34577134e0

On 2017-10-06 21:01:48, alex.jakime...@gmail.com wrote:
> This one is a bit harder than it seems.
>
> So here is what throws:
>
https://github.com/rakudo/rakudo/blob/f62ae60c48d1372df18b49aca44e10af44ead2d6/src/Perl6/Grammar.nqp#L315
>
> However, the cursor has wrong position for some reason. Looking at the
> lines
> above, it may seem that doing this:
>
> self.'!cursor_pos'($pos);
>
> should fix the problem… but it doesn't! $pos variable is set
> correctly, but
> !cursor_pos does absolutely nothing. In fact, you can try setting it
> to 0 or
> any other value, no effect whatsoever.
>
> This suggests that the use of !cursor_pos in the same method does not
> work too.
> What is the right way to set the cursor?
>
> And why does the cursor even have the incorrect value there?
>
> As a bonus, this line seems to be unreachable:
> self.missing("block (taken by some undeclared routine?)");
>
> I tried various things but nothing can trigger it. I found (via
> google) some
> code snippets that used to result in this error message, but nowadays
> it simply
> says “Missing block”. I bisected that change to
>
https://github.com/rakudo/rakudo/commit/8a70c921e98ed260d3198d81b81b0960c8daa83b
>
>
> On 2015-07-24 05:13:59, alex.jakime...@gmail.com wrote:
> > Code:
> > if True if { };
> >
> > ===SORRY!=== Error while compiling ./test.pl
> > Missing block
> > at ./test.pl:3
> > ------> if True if ⏏{ };
> >
> > Clearly the block is there. It seems like it expects a block before
> > the
> > second "if", but the cursor is placed incorrectly. STD gets it right:
> >
> > 15:03:25<jnthn> std: if True if { };
> > 15:03:26<camelia> std 28329a7: OUTPUT«===SORRY!===␤Missing block at
> > /tmp/XbS0PJUJZo line 1:␤------> if True ⏏if { };␤Parse
> > failed␤FAILED 00:00 135m␤»
> >
> > Similar problem with "unless", "while" and maybe some others.
> >
> > Tiny IRC discussion: http://irclog.perlgeek.de/perl6/2015-07-
> > 24#i_10947603

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