https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67269
--- Comment #1 from Ian Lance Taylor <ian at airs dot com> ---
Here is a similar, though different, case involving a constructor:
_ZZN1C1D1E1F1G1HEvENUlvE_C2EOS4_
The demangler currently turns this into:
C::D::E::F::G::H()::{lambda()#1}::H({lambda()#1}&&)
That is clearly wrong: H is part of the local name. It's not the constructor.
The correct demangling would probably be
C::D::E::F::G::H()::{lambda()#1}::{lambda()#1}({lambda()#1}&&)
