def __init__(self, context, builder, struct_type):
        """
        Parameters
        ----------
        context :
            a numba target context
        builder :
            a llvmlite IRBuilder
        struct_type : numba.core.types.StructRef
        """
        self.context = context
        self.builder = builder
        self.struct_type = struct_type

        Parameters
        ----------
        context :
            a numba target context
        builder :
            a llvmlite IRBuilder
        struct_type : numba.core.types.StructRef
        
numba/experimental/structref.py