From @b2gills

If you add any spaces anywhere in reduce part of the following it fails to compile.
Rakudo complains about two terms in a row immediately following the reduce part if you do.

  [[&({$^a*2+$^b})]] 1,2,3

That is this should be valid

  [[&( { $^a * 2 + $^b } )]] 1,2,3

It works if you write it as infix operators

  1 [&( { $^a * 2 + $^b } )] 2 [&( { $^a * 2 + $^b } )] 3

This also affects triangle reduce

  [\[&({$^a*2+$^b})]] 1,2,3

From @zoffixznet

Still present today in 5c5ef1

<Zoffix> m​: [[&( { $^a * 2 + $^b } )]] 1,2,3
<camelia> rakudo-moar 5c5ef1​: OUTPUT«===SORRY!=== Error while compiling <tmp>␤Two terms in a row␤at <tmp>​:1␤------> [[&( { $^a * 2 + $^b } )]]⏏ 1,2,3␤ expecting any of​:␤ infix␤ infix stopper␤ statement end␤ statement modifier␤ …»

--
Cheers,
ZZ | https://twitter.com/zoffix

From @zoffixznet

As per TimToady, such whitespace is actually not allowed in this op, to help distinguish them from [1, 2, 3] and such​: http://irclog.perlgeek.de/perl6/2016-08-02#i_12956488

--
Cheers,
ZZ | https://twitter.com/zoffix

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

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