[Bug c++/82070] New: [8 Regression] inaccessible within this context in lambda rejects valid

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82070

            Bug ID: 82070
           Summary: [8 Regression] inaccessible within this context in
                    lambda rejects valid
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: jason at gcc dot gnu.org
  Target Milestone: ---

Starting from r251433 we reject (reduced from Firefox):

$ cat pkixcert.ii
namespace a {
template <typename b>
void
c (int, int, b d)
{
  [d] { [d] {}; };
}
}
void
e ()
{
  int f;
  a::c (f, 3, [] {});
}

$ g++ pkixcert.ii -c -std=gnu++11
pkixcert.ii: In instantiation of ‘void a::c(int, int, b) [with b =
e()::<lambda()>]’:
pkixcert.ii:13:20:   required from here
pkixcert.ii:6:5: error: ‘e()::<lambda()> a::c(int, int, b) [with b =
e()::<lambda()>]::__lambda0::<d capture>’ is inaccessible within this context
   [d] { [d] {}; };
     ^
pkixcert.ii:6:4: note: declared here
   [d] { [d] {}; };
    ^
pkixcert.ii:6:5: error: invalid use of nonstatic data member ‘a::c(int, int, b)
[with b = e()::<lambda()>]::__lambda0::<d capture>’
   [d] { [d] {}; };
     ^