https://issues.dlang.org/show_bug.cgi?id=22092

          Issue ID: 22092
           Summary: [REG2.067] for loop over range with closure loops
                    infinitely
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: wrong-code
          Severity: regression
          Priority: P3
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: dlang-bugzilla@thecybershadow.net

///////////////////// test.d /////////////////////
void formatRange(T)(T val)
{
    for (size_t i; !val.empty; val.popFront, i) {}
}

void fun() {}

auto makeRange()()
{
    int pos;
    struct R
    {
        bool empty() { return pos == 3; }
        void popFront() const
        {
            ++pos;

            version (no_bug) fun();
        }
    }
    return R();
}

void main()
{
    auto r = makeRange;
    formatRange(r);
}
//////////////////////////////////////////////////

Note that with -version=no_bug (i.e. adding a call to an empty function), the
bug does not manifest.

Introduced in https://github.com/dlang/dmd/pull/3956

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