[antlr-interest] Re: bug: invalid "Syntactic predicate superfluous" warning

[thrutchy]

For those that are overwelmed with these invalid warnings, here is a
little filtering script:

#!/usr/bin/perl
use IPC::Open3;
open3( "<&STDIN", ">&STDOUT", \*ERR , 'antlr', @ARGV );
$/=undef;
$_=<ERR>;
s/
^(.*) \Qwarning:nondeterminism upon\E\n
(\1 .* \n)*
\1 \Qwarning:Syntactic predicate superfluous for single alternative\E\n
//gmx;
print(STDERR "$_");

--- In antlr-interest at yahoogroups.com, Monty Zukowski <monty at c...> wrote:
> This is a known bug.
> 
> Thanks,
> 
> Monty
> 
> On Jul 16, 2004, at 3:18 PM, thrutchy wrote:
> 
> > I used a syntactic predicate in a loop to solve an ambiguity:
> >
> > ( (a) => a )*
> >
> > but, it still gave the ambiguity warning plus a new one:
> >
> > warning:nondeterminism upon
> >                ...
> >     between alt 1 and exit branch of block
> > warning:Syntactic predicate superfluous for single alternative
> >
> > The syntactic predicate did solve my problem and thus wasn't
> > superfluous.  Effectively there are always effectively at least two
> > alternatives in a loop because of the exit condition.
> >
> > ( (a) => a )+ also exhibits the same problem.  ( (a) => a )? gives no
> > warning.
> >
> > Eric
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
> 
> ANTLR & Java Consultant -- http://www.codetransform.com
> ANSI C/GCC transformation toolkit -- 
> http://www.codetransform.com/gcc.html
> Embrace the Decay -- http://www.codetransform.com/EmbraceDecay.html



 
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