[Issue 10638] New: Assignment can't be used as a condition

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10638

           Summary: Assignment can't be used as a condition
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: freeslave93 at gmail.com


--- Comment #0 from Roman <freeslave93 at gmail.com> 2013-07-14 04:44:07 PDT ---
Suppose code

void main()
{
    int i = 0;
    if (i = 1)
    {
        //......
    }
}

dmd compiler generates error: "assignment cannot be used as a condition,
perhaps == was meant?"

But next code passed successfully:

void main()
{
    if (int i = 1)
    {
        //......
    }
}

It's a bit odd that assignment can not be used as condition while declaration
can be.

It works fine if we replace first code snippet with this:

void main()
{
    int i = 0;
    if (cast(bool)(i = 1))
    {
        //......
    }
}

I guess assignment has no implicit cast to bool, it's weird too. If it's not
error, please, explain me the reasons of this restriction. 

Also dlang.org defines ifStatement as "if ( IfCondition ) ThenStatement", where
ifCondition can be Expression (hence AssignExpression too), but it seems it
does not work at practice.

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