typeid failed on fused types #3203

thautwarm · 2019-10-23T07:37:30Z

# cython: language=c++
# cython: language_level=3str
from libcpp.typeinfo cimport type_info
from cython.operator cimport typeid
cdef fused C: 
   int 
   object 
cdef const type_info* i32 = &typeid(int) 
cdef f(C x): 
    cdef const type_info* a = &typeid(C) 
    return a  == i32 
     
def g(x): 
   return (x, f(x))


        Potential fix for GH issue cython#3203

Gets the specialized type if possible from NameNode.analyse_as_type This does introduce a potential new bug: ``` cimport cython just_float = cython.fused_type(float) cdef OK1(just_float x): return just_float in floating cdef fail1(just_float x, floating y): return just_float in floating cdef fail2(floating x): return floating in floating def show(): """ >>> show() True True True True """ print(OK1(1.0)) print(fail1(1.0, 2.0)) print(fail1[float, double](1.0, 2.0)) print(fail2[float](1.0)) ``` fail1 and fail2 work before this patch but fail with it. It isn't clear to me if this should actually be considered a bug. It works in both versions with `cython.floating`, which possibly suggests analyse_as_type in AttributeNode should also be changed

scoder · 2019-10-26T05:02:09Z

It's generally helpful in bug reports to also show the error message that results, as well as other relevant information, such as the code that was generated. Providing this information reduces the time that others need to plan to invest in order to investigate the issue. Basically, when I have limited time and an issue seems more costly to look into than what I currently can (or want to) invest, I look at other issues first.

thautwarm · 2019-10-26T07:52:59Z

Okay, will do this

cython/cython

typeid failed on fused types #3203

typeid failed on fused types #3203

thautwarm commented Oct 23, 2019

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scoder commented Oct 26, 2019

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thautwarm commented Oct 26, 2019

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typeid failed on fused types #3203

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thautwarm commented Oct 23, 2019

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scoder commented Oct 26, 2019

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thautwarm commented Oct 26, 2019