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From: "johelegp at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/102576] [modules] Importing <initializer_list> doesn't
 permit implicit uses
Date: Sun, 03 Oct 2021 14:37:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102576

--- Comment #1 from Johel Ernesto Guerrero Pe=C3=B1a <johelegp at gmail dot=
 com> ---
`<array>` is specified as including `<initializer_list>`.
It doesn't with with that either:

```C++
import<array>;

namespace {

constexpr void test() {
  for (const int i : {0, 1, -1}) { }
```

```
error: deducing from brace-enclosed initializer list requires =E2=80=98#inc=
lude
<initializer_list>=E2=80=99
    2 | import<array>;
  +++ |+#include <initializer_list>
    3 | // import<iterator>;
......
   10 |   for (const int i : {0, 1, -1}) {
      |                               ^
```

This might apply more generally to standard headers specified as including
other headers.=