visit_node(a) File "/builds/seitz/pystencils/pystencils/transformations.py", line 584, in visit_node sub_ast) File "/builds/seitz/pystencils/pystencils/transformations.py", line 558, in visit_sympy_expr field_access.index) File "/builds/seitz/pystencils/pystencils/astnodes.py", line 574, in __new__ assert isinstance(base.label, TypedSymbol)AssertionErrorERROR: Job failed: exit code 1