[Issue 10288] New: Direct lambda call and purity inference bug

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10288

           Summary: Direct lambda call and purity inference bug
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: k.hara.pg at gmail.com


--- Comment #0 from Kenji Hara <k.hara.pg at gmail.com> 2013-06-06 22:16:56 PDT ---
In this code, foo and bar are essentially equivalent, but foo is not inferred
to pure.

T foo(T)(T x)
{
    () @trusted { x += 10; } ();
    return x;
}
T bar(T)(T x)
{
    void lambda() @trusted nothrow { x += 10; }
    lambda();
    return x;
}
@safe pure nothrow void main()
{
    assert(foo(10) == 20);
    // -> Error: pure function 'main' cannot call impure function 'foo'

    assert(bar(10) == 20);
    // -> OK
}

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