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digitalmars.D.bugs - [Issue 17127] New: bad example code for std.concurrency.Generator


          Issue ID: 17127
           Summary: bad example code for std.concurrency.Generator
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: P1
         Component: phobos
          Assignee: nobody puremagic.com
          Reporter: ag0aep6g gmail.com

Found by Profile Anaysis who posted to D.learn:
http://forum.dlang.org/post/vlvqmzrfvqmxzsfxpslu forum.dlang.org

The example code for std.concurrency.Generator [1] throws an OwnerTerminated
exception. The code:

import std.concurrency;
import std.stdio;

void main()
    auto tid = spawn(
        while (true)

    auto r = new Generator!int(
        foreach (i; 1 .. 10)

    foreach (e; r)

The exception gets thrown because the spawned thread still tries to receive
ints after the main thread has finished. The example code should be fixed.

[1] https://dlang.org/library/std/concurrency/generator.html

Jan 30 2017