[Issue 4931] New: Implicit opCast!bool in if statement doesn't work with declarator

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4931

           Summary: Implicit opCast!bool in if statement doesn't work with
                    declarator
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: patch
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: rsinfu at gmail.com


--- Comment #0 from Shin Fujishiro <rsinfu at gmail.com> 2010-09-23 20:49:09 PDT ---
Created an attachment (id=772)
Patch against dmd r686

If an if statement has a variable declarator, a condition is implicitly
converted to bool before its value is assigned to the declared variable.  The
following code doesn't compile:
--------------------
void main()
{
    if (S s = S()) {}   // (3)
}
struct S
{
    bool opCast(T : bool)() { return true; }
}
--------------------
% dmd -o- -c test.d
test.d(3): Error: cannot implicitly convert expression (S().opCast()) of type
bool to S

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