GNU bug report logs - #6978
show-paren-mode doesn't match when scope "::" operator is used : emacs 32.1.97

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From: Alan Mackenzie <acm <at> muc.de>
To: Stefan Kangas <stefan <at> marxist.se>
Cc: 6978 <at> debbugs.gnu.org
Subject: bug#6978: show-paren-mode doesn't match when scope "::" operator is used : emacs 32.1.97
Date: 6 Oct 2019 17:38:50 -0000

In article <mailman.1087.1570362019.2651.bug-gnu-emacs <at> gnu.org> you wrote:
> severity 6978 minor
> found 6978 27.0.50
> quit

> "Bob" <purchasebyemail1 <at> comcast.net> writes:

>>
>>
>> Emacs 23.1.97:
>>
>>
>>
>> When using the C++ scope operator "::", show-paren-mode gets confused:
>>
>>
>>
>> ------  Foo.cpp ------------------------------------
>>
>> struct Foo1 {};
>>
>>
>>
>> namespace X
>>
>> {
>>
>>   struct Foo2 {};
>>
>>
>>
>>   template<class _Y>
>>
>>   struct Bar;
>>
>>
>>
>>   template<>
>>
>>   struct Bar<::Foo1>         // "(show-paren-mode)" does not match `>` to `<`
>>
>>   {
>>
>>   };
>>
>>
>>
>>   template<>
>>
>>   struct Bar<Foo2>           // "(show-paren-mode)" correctly matches `>` to `<`
>>
>>   {
>>
>>   };
>>
>> }
>>
>> ---------------------------------------------

> I can reproduce this on current master.

This is a CC Mode bug.  The pertinent < and > are not being marked with
syntax-table text properties, hence can't be recognised as parens.

I'll be looking into this.

> Best regards,
> Stefan Kangas

-- 
Alan Mackenzie (Nuremberg, Germany).

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