[Issue 21297] New: profile builds in own project fail with 'statement is not reachable' in Phobos' std/concurrency.d

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21297

          Issue ID: 21297
           Summary: profile builds in own project fail with 'statement is
                    not reachable' in Phobos' std/concurrency.d
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: zorael at gmail.com

dmd v2.093.1, Manjaro/Arch x86_64.

When trying to build a profile build of my project using dub and `dub -b
profile`, it fails with a warning of 'statement not reachable' in
`std/concurrency.d`.

---

import std;

void main()
{
    bool receivedSomething;
    static immutable instant = 1.seconds;
    thisTid.send(1);

    do
    {
        receivedSomething = receiveTimeout(instant, (Variant v) {});
    }
    while (receivedSomething);
}

---

dmd -inline -w -profile theabove.d
> /usr/include/dlang/dmd/std/concurrency.d(2087): Warning: statement is not reachable

https://run.dlang.io/is/u7se6m

Both -profile and -inline need to be present.

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