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From: "tobi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/101435] Bad error with missing typename keyword
Date: Tue, 13 Jul 2021 11:02:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101435

--- Comment #1 from Tobias Schl=C3=BCter <tobi at gcc dot gnu.org> ---
Grrr, I made a mistake in describing the issue with the code: what is missi=
ng
is the `template` keyword before `cast`, so it should read
     return err =3D=3D 0 ? M{ v.template cast<typename M::Scalar>() } : fal=
lback;
                            ^^^^^^^^^
Of course GCC gives errors everywhere but there :D=