[Sqlalchemy-tickets] Issue #3485: dont do recursion overflow when FunctionElement type is None (zzzeek/sqlalchemy)

[Mike B. <iss...@bi...>]

New issue 3485: dont do recursion overflow when FunctionElement type is None
https://bitbucket.org/zzzeek/sqlalchemy/issues/3485/dont-do-recursion-overflow-when

Mike Bayer:


```
#!python

from sqlalchemy.sql.functions import FunctionElement
from sqlalchemy import Integer
from sqlalchemy.ext.compiler import compiles

class MissingType(FunctionElement):
    name = 'mt'
    type = None

class NotMissingType(FunctionElement):
    name = 'nmt'
    type = Integer


@compiles(NotMissingType)
@compiles(MissingType)
def _fn(element, compiler, **kw):
    return element.name

print NotMissingType()
print MissingType()
```

the second one recursion overflows


```
#!

  File "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/sql/elements.py", line 722, in __getattr__
    return getattr(self.comparator, key)
  File "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/sql/elements.py", line 722, in __getattr__
    return getattr(self.comparator, key)
  File "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/sql/elements.py", line 722, in __getattr__
    return getattr(self.comparator, key)
  File "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/sql/elements.py", line 722, in __getattr__
    return getattr(self.comparator, key)
  File "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/sql/elements.py", line 722, in __getattr__
    return getattr(self.comparator, key)
  File "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/sql/elements.py", line 722, in __getattr__
    return getattr(self.comparator, key)
  File "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/sql/elements.py", line 722, in __getattr__
    return getattr(self.comparator, key)
  File "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/sql/elements.py", line 722, in __getattr__
    return getattr(self.comparator, key)
  File "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/sql/elements.py", line 722, in __getattr__
    return getattr(self.comparator, key)

```

this goes back to at least 0.9  but 1.0.7 is fine