[perl #114180] illegalproto warnings are very incomplete

On Wed Jul 18 00:10:51 2012, l.mai@web.de wrote:
> 
> This is a bug report for perl from l.mai@web.de,
> generated with the help of perlbug 1.39 running under perl 5.16.0.
> 
> 
> -----------------------------------------------------------------
> [Please describe your issue here]
> 
> All of these should warn about illegal prototypes but don't:
> 
> % perl -we 'sub f ([)'
> % perl -we 'sub f (][[[[[[)'
> % perl -we 'sub f (\;)'
> % perl -we 'sub f (\[_;@])'
> % perl -we 'sub f (\+)'
> % perl -we 'sub f (\\\\)'
> % perl -we 'sub f ([$])'
> 
> 
> This one warns for the wrong reason:
> 
> % perl -we 'sub f (\[_$])'
> Illegal character after '_' in prototype for main::f : \\[_$] at -e
>    line 1.
> 
> 
> This one is semantically nonsense but "works":
> 
> % perl -we 'sub f (_;_;_)'

What I don’t understand is why we need the warning anyway, since you get
an error why applying the prototype.  And perl can’t know ahead of time
whether its default call checker will be parsing the prototype.

-- 

Father Chrysostomos


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via perlbug:  queue: perl5 status: new
https://rt.perl.org:443/rt3/Ticket/Display.html?id=114180

• [perl #114180] illegalproto warnings are very incomplete by Father Chrysostomos via RT