From @AlexDaniel

Code​:
gather for ^3 -> $a, $b { take 1 }

Result​:
===SORRY!===
Too few positionals passed; expected 2 arguments but got 1

The error message has no line number.

This snippet is from real code (although I've golfed it down), the question
was asked on #perl6​: http://irclog.perlgeek.de/perl6/2015-12-24#i_11767980

Running it with --ll-exception reveals the line number.

So, that's as short as I can golf it. In fact, if you change it a little
bit, like
Code​:
gather for ^1 -> $a, $b { take 1 }

Result​:
Too few positionals passed; expected 2 arguments but got 1
  in code at test3.pl​:2
  in block <unit> at test3.pl​:2

Then, as you can see, the stacktrace suddenly appears. Weird.

From @zoffixznet

Has been fixed per http://irclog.perlgeek.de/perl6-dev/2016-08-21#i_13062293

Tests needed

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

From @zoffixznet

Tests added in Raku/roast@4a02aaaa75

@zoffixznet - Status changed from 'open' to 'resolved'