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Postings from February 2018
Dave Mitchell <davem@iabyn.com> writes:
> On Thu, Feb 22, 2018 at 10:27:18AM +0000, Dave Mitchell wrote:
>> I plan to do the following two things shortly (assuming they prove
>> feasible):
>>
>> 1) change the parser so that subs under 'use feature signatures' use
>> a different grammar rule than subs not under it - possibly by making the
>> toker return two different sub tokens, e.g. 'SUB' and a new 'SIGSUB'
>> token say, depending on whether the feature is in scope.
>>
>> This will then help reduce confusing errors, e.g. this code with a syntax
>> error (attrs before prototype):
>>
>> no feature 'signatures';
>> sub f :lvalue ($$@) { $x = 1 }
>>
>> currently gives:
>>
>> Illegal character following sigil in a subroutine signature at
>> ..., near "($"
>>
>> It's parsing the ($$@) as a sub signature even though signatures aren't in
>> scope, so the error message is confusing.
>>
>> 2) For the signature sub grammar rule, allow it to spot attributes
>> following a signature and croak with a meaningful error. Which is what the
>> OP requested.
>
> I've now done this and pushed as branch smoke-me/davem/sig_attr_croak.
> If there's a rough consensus, I'll merge it soon.
LGTM
- ilmari
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