[svn r335] The basics of exception handling are in place. Still need to make sure calls are turned into invokes everywhere. (NewExpression for instance) Still some rough edges and corner cases to figure out. Needs testing!

module bug17;

struct Vec
{
    Vec opAdd(ref Vec b) { return Vec(); }
    Vec opMul(double a) { return Vec(); }
}
void main()
{
    Vec foo;
    Vec bar;
    auto whee=foo+bar*1f;
}