[Bug c++/86226] New: A bug seems to be not fully fixed

["zhonghao at pku dot org.cn" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86226

            Bug ID: 86226
           Summary: A bug seems to be not fully fixed
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhonghao at pku dot org.cn
  Target Milestone: ---

The code is as follow:

 int main() {
 auto l = []<typename>(){};
 l.operator()<void>();
 }

It was reported in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77914. Michele
Caini complains that g++ does not produce any warnings for this ill-formed
code.

The report is said to be resolved, since 7+.

I tried on 8.0.1 with the same flags, -Wall -pedantic. I got a warning:
lambda templates are only available with -std=c++2a or -std=gnu++2a

So, I change the flag to -std=c++2a. This time, g++ accepts it without any
messages. 

I also tried clang++. It produces the following error messages:
error: expected body of lambda expression
     auto l = []<typename>(){};
error: expected a qualified name after 'typename'
     auto l = []<typename>(){};



It seems that the bug is not fixed, right?