class PreconditionError (TypeError):
    pass


def preconditions(*precs):
    pass # stub.

class PreconditionError (TypeError):
    pass


def preconditions(*precs):
    def decorate(f):
        def g(*a, **kw):
            return f(*a, **kw)
        return g
    return decorate

Implement a stub decorator factory.
Implement a stub decorator factory.

  class PreconditionError (TypeError):
      pass
  
  
  def preconditions(*precs):
-     pass # stub.
+     def decorate(f):
+         def g(*a, **kw):
+             return f(*a, **kw)
+         return g
+     return decorate
  
Implement a stub decorator factory.
## Code Before:
class PreconditionError (TypeError):
    pass


def preconditions(*precs):
    pass # stub.

## Instruction:
Implement a stub decorator factory.
## Code After:
class PreconditionError (TypeError):
    pass


def preconditions(*precs):
    def decorate(f):
        def g(*a, **kw):
            return f(*a, **kw)
        return g
    return decorate
