kou commented on PR #41111:
URL: https://github.com/apache/arrow/pull/41111#issuecomment-2071208511
It seems that `[[maybe_unused]]` in constructor arguments is only
unsupported:
```console
$ docker run -it --rm almalinux:8
$ dnf install -y gcc-c++ vim
$ vim a.cc
$ cat a.cc
class A {
explicit A([[maybe_unused]] int x) {}
void a([[maybe_unused]] int x) {}
};
int main([[maybe_unused]] int argc, [[maybe_unused]] char **argv) {
return 0;
}
$ LANG=C g++ -std=c++17 a.cc
a.cc:2:14: error: expected unqualified-id before '[' token
explicit A([[maybe_unused]] int x) {}
^
a.cc:2:14: error: expected ')' before '[' token
explicit A([[maybe_unused]] int x) {}
~^
)
```
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