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[perl #125674] [LTA] error message prints wrong eject position (ifTrue if { };)

From:
Aleks-Daniel Jakimenko-Aleksejev via RT
Date:
February 2, 2018 17:39
Subject:
[perl #125674] [LTA] error message prints wrong eject position (ifTrue if { };)
Message ID:
rt-4.0.24-12815-1517593177-1610.125674-80-0@perl.org
Does not seem to be fixed at all. But I've added some todo-ed tests:
https://github.com/perl6/roast/commit/f9f5034a1e66e068bfe21227e35f100f3c1e3fef

On 2017-10-07 13:43:30, alex.jakimenko@gmail.com wrote:
> 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.jakimenko@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.jakimenko@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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