[Issue 4891] New: Assignment from non-pure function to pure function pointer compiles when it shouldn't

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http://d.puremagic.com/issues/show_bug.cgi?id=4891

           Summary: Assignment from non-pure function to pure function
                    pointer compiles when it shouldn't
           Product: D
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: jmdavisProg at gmx.com


--- Comment #0 from Jonathan M Davis <jmdavisProg at gmx.com> 2010-09-18 16:07:33 PDT ---
Take this program

struct S
{
public:

    this(int function(int) pure func)
    {
        _func = func;
    }

    @property int function(int) pure func()
    {
        return func;
    }

private:
    int function(int) pure _func;
}

int add1(int num)
{
    return num + 1;
}

void main()
{
    auto s = S(&add1);
}


The construction of s should not compile because add1() is not a pure function.
Granted, it could be pure if I declared it as such, but I didn't. And the
compiler isn't figuring out that add1() could be pure and letting it through
because of that because if I add a writeln() call to add1(), it still compiles.

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