Let show_code also work for KernelWrapper

8 jobs for KernelWrapper in 3 minutes and 29 seconds (queued for 2 seconds)
Name Stage Failure
failed
minimal-sympy-master Test
    visit_node(a)
File "/builds/seitz/pystencils/pystencils/transformations.py", line 526, in visit_node
sub_ast.lhs = visit_sympy_expr(sub_ast.lhs, enclosing_block, sub_ast)
File "/builds/seitz/pystencils/pystencils/transformations.py", line 504, in visit_sympy_expr
field_access.offsets, field_access.index)
File "/builds/seitz/pystencils/pystencils/astnodes.py", line 591, in __new__
assert isinstance(base.label, TypedSymbol)
AssertionError
ERROR: Job failed: exit code 1