crash in type inference when accessing Python attribute of C double
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This snippet from CPython's test_types.py crashes during type inference in AttributeNode:
f = 1.1234e90 result = f.__format__('f')
The problem is that the AttributeNode tries to coerce the number to a Python object, but the NameNode doesn't know its type yet. So it crashes with
File "Cython/Compiler/ExprNodes.py", line 601, in coerce_to src_is_py_type = src_type.is_pyobject AttributeError: 'NoneType' object has no attribute 'is_pyobject'
In general, type inference shouldn't have this kind of side effect.