[Bug c++/94426] [10 Regression] ICE in mangle_decl with -flto

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94426

--- Comment #5 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Reduced testcase:

template <bool> using Void = void;

template <typename U> bool Init (U);

template <typename> bool VAR = Init ([] {});

template <typename T>
Void<false && VAR<T>> Foo (T)
{}

void q ()
{
  Foo ([] {});
}

bug.ii: At global scope:
bug.ii:5:38: internal compiler error: in mangle_decl, at cp/mangle.c:3907
    5 | template <typename> bool VAR = Init ([] {});