Bugzilla

If I try to parse this IDL:
```
  typedef long foo;
  typedef long foo;
```
I get an exception like so:
```
  AttributeError: 'IDLTypedef' object has no attribute 'innerType'
```
This is not helpful.  It happens because IDLTypedef.__init__ tries to resolve the identifier conflict before assigning self.innerType, but when that fails it tries to call __str__ in the IDLTypedef, which tries to use self.innerType.

We should either assign .innerType first or change __str__ to deal.  If I do the assignment first, then for my testcase I get:
```
  WebIDLError: error: Multiple unresolvable definitions of identifier 'foo' in scope '::
        Typedef foo Long at <unknown> line 2:4
    typedef long foo;
    ^
        Typedef foo Long at <unknown> line 3:4
    typedef long foo;
    ^
```
which is a lot nicer.

If I try to parse this IDL:
```
  typedef long foo;
  typedef long foo;
```
I get an exception like so:
```
  AttributeError: 'IDLTypedef' object has no attribute 'innerType'
```
This is not helpful.  It happens because `IDLTypedef.__init__` tries to resolve the identifier conflict before assigning self.innerType, but when that fails it tries to call `__str__` in the IDLTypedef, which tries to use self.innerType.

We should either assign .innerType first or change `__str__` to deal.  If I do the assignment first, then for my testcase I get:
```
  WebIDLError: error: Multiple unresolvable definitions of identifier 'foo' in scope '::
        Typedef foo Long at <unknown> line 2:4
    typedef long foo;
    ^
        Typedef foo Long at <unknown> line 3:4
    typedef long foo;
    ^
```
which is a lot nicer.