TypeError in __init__ throws OnlyInstantiableViaProviderFunctionError

[MirkoRossini]

Hello,

every time I cause a TypeError in the init method of an injected class, pinject raises a pretty cryptic Exception that makes debugging way harder:

import pinject
class Foo(object):
def init(self, bar):
self.bar = bar

class Bar(object):
def init(self, foo_bar):
self.foo_bar = foo_bar

class FooBar(object):
def init(self):
raise TypeError("test")

o = pinject.new_object_graph()
o.provide(Foo)

Traceback (most recent call last):
File "/tmp/a.py", line 16, in
o.provide(Foo)
File "/spare/local/secmaster-overwatch-infra/lib/python2.7/site-packages/pinject/object_graph.py", line 244, in provide
raise e
pinject.errors.OnlyInstantiableViaProviderFunctionError: when injecting Bar.init at /tmp/a.py:8, the arg named "foo_bar" unannotated cannot be injected, because its provider, the class main.FooBar at /tmp/a.py:11, needs at least one directly passed arg

Thanks

Mirko