class_docstr: Identify constant expressions.
class_docstr_tok: ["Identify","constant","expressions","."]
code: def visit_UnaryOp(self, node):
      return self.visit(node.operand) and self.add(node)
  
imports: from pythran.analyses.aliases import Aliases
  from pythran.analyses.globals_analysis import Globals
  from pythran.analyses.locals_analysis import Locals
  from pythran.analyses.pure_functions import PureFunctions
  from pythran.intrinsic import FunctionIntr
  from pythran.passmanager import NodeAnalysis
  import gast
label_desc: Use image node_id 5 for calling the ConstantExpressions obj's underlying member method code with example usage: obj.visit_UnaryOp(node) and returns: unknown