[Issue 4969] New: nothrow check can't handle multiple catches

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4969

           Summary: nothrow check can't handle multiple catches
           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> 2010-10-01 20:55:33 PDT ---
This code should compile:

class MyException : Exception
{
    this()
    {
        super("An exception!");
    }
}

void throwAway()
{
    throw new MyException;
}

void cantthrow() nothrow
{
    try
        throwAway();
    catch(MyException me)
        assert(0);
    catch(Exception e)
        assert(0);
}

void main()
{
}


It doesn't. Instead, you get this error:

d.d(14): Error: function d.cantthrow 'cantthrow' is nothrow yet may throw


If you remove catch(MyException e) and its body, then the program compiles.
Given that the catch block that catches MyException cannot throw an exception
of its own and that the catch block following it catches Exception (and
therefore will catch all exceptions) and cannot throw an exception, the
compiler should be able to clearly determine that no exception can escape
cantthrow, but apparently, it can't.

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