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From: "sand at rifkin dot dev" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/100482] namespaces as int in decltype expression
Date: Sat, 08 May 2021 03:31:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100482

--- Comment #1 from Jeremy R. <sand at rifkin dot dev> ---
This appears to be valid for function return types as well but the compiler
does error when decltype is used in a function parameter

namespace std{}
int A(int a) { // fine
    decltype(std) b =3D a;
    return b;
}
decltype(std) B(int a) {  // fine
    decltype(std) b =3D a;
    return b;
}
auto C(int a) -> decltype(std) {  // fine
    decltype(std) b =3D a;
    return b;
}
int D(decltype(std) a) { // error: expected initializer before 'a'
    decltype(std) b =3D a;
    return b;
}=