This works though:

qqq =: 3 : 0"0
  whilst. 0 do.
    if. y do. break. end.
    'true'
    return.
  end.
  'false'
)
   qqq 0 1
true 
false

On Sun, 2020-01-12 at 19:04 +0000, 'Mike Day' via Programming wrote:
> Has break. been decommissioned? 
> 
> I was getting the following behaviour earlier today in release
> b,  but find it's still there in 
> release c: 
> 
>    JVERSION
> Engine: j901/j64avx2/windows
> Release-c: commercial/2020-01-11T13:29:14
> Library: 9.01.20
> Qt IDE: 1.8.5s/5.12.6
> Platform: Win 64
> Installer: J901 install
> InstallPath: c:/d/j901
> Contact: www.jsoftware.com
>    
>    load 'c:/d/j901/user/temp/246.ijs'
> > control error
> >   [0]if. y do. break. end.
> >   qqq=:3     :0
> > [-6] c:\d\j901\user\temp\246.ijs
>    
>    where qqq is just this demo function to show the problem: 
> qqq =: 3 : 0
> if. y do. break. end.
>    'true'
>    return.
> end.
> 'false'
> )
> 
> Thanks,
> 
> Mike
> 
> 
> > On 11 January 2020 at 20:12 Eric Iverson <eric.b.iver...@gmail.com>
> > wrote:
> > 
> > 
> > j901-release-c is available for windows/linux/macos
> > 
> > It has bug fixes to the previous release.
> > 
> > Please upgrade your j901 install when convenient with:
> > 
> > start J
> >    load 'pacman'
> >    'upgrade' jpkg 'jengine'
> > 
> > ***
> > raspberry and android release-c will be announced when available.
> > -----------------------------------------------------------------
> > -----
> > For information about J forums see 
> > http://www.jsoftware.com/forums.htm
> -------------------------------------------------------------------
> ---
> For information about J forums see 
> http://www.jsoftware.com/forums.htm

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