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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/103946] [12 Regression] ice in build_vec_init_expr, at
 cp/tree.c:791
Date: Fri, 07 Jan 2022 23:25:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103946

--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
Reduced C++ code is:

class UnicodeSet {
  virtual UnicodeSet complement();
};
enum { URX_GC_T, URX_LAST_SET };
class RegexStaticSets {
  RegexStaticSets();
  UnicodeSet fPropSets[URX_LAST_SET]{};
};
RegexStaticSets::RegexStaticSets() {}

I will have a look at a git bisect tomorrow.=