[Issue 23421] New: File.rawRead is @system on Windows

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23421

          Issue ID: 23421
           Summary: File.rawRead is @system on Windows
           Product: D
           Version: D2
          Hardware: All
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: snarwin+bugzilla at gmail.com

The following program compiles on Linux, but not on Windows:

---
import std.stdio;

void main() @safe
{

}

private ubyte readByte(File file) @safe
in(file.isOpen)
{
    ubyte[1] buffer;
    return file.rawRead(buffer)[0];
}
---

The error message is:

--
Performing "debug" build using C:\D\dmd2\windows\bin\dmd.exe for x86_64.
safetest ~master: building configuration "application"...
Performing "debug" build using C:\D\dmd2\windows\bin\dmd.exe for x86_64.
safetest ~master: building configuration "application"...
source\app.d(12,24): Error: `@safe` function `app.readByte` cannot call
`@system` function `std.stdio.File.rawRead!ubyte.rawRead`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\stdio.d(1138,9):       
`std.stdio.File.rawRead!ubyte.rawRead` is declared here
C:\D\dmd2\windows\bin\dmd.exe failed with exit code 1.
---

The cause is likely several calls to extern(C) functions in a version (Windows)
block:

https://github.com/dlang/phobos/blob/v2.100.2/std/stdio.d#L1145-L1159

--