Testcase: extern int i; extern "C" int i; http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#563 is still active. We currently reject this on the 4.1 branch and the mainline but that is because of the patch for PR 27227.
Suspending until the Defect report is really closed.
> [Accepted at the November, 2020 meeting as part of paper P1787R6 and moved to DR at the February, 2021 meeting.]