code: def test_symbol_not_found():
      e = a * a + b
      raises(LookupError, lambda: g.llvm_callable([a], e))
  
imports: from sympy.external import import_module
  from sympy.testing.pytest import raises
  import ctypes
  import sympy
  from sympy.abc import a, b, n
label_desc: Use image node_id 17 for calling a global function with example usage: test_symbol_not_found() without return types