shift deprecated_call helper into pytest_recwarn plugin

--HG--
branch : trunk

py/test/outcome.py

@@ -112,32 +112,6 @@ def raises(ExpectedException, *args, **kwargs):
     raise ExceptionFailure(msg="DID NOT RAISE", 
                            expr=args, expected=ExpectedException) 
 
-def deprecated_call(func, *args, **kwargs):
-    """ assert that calling func(*args, **kwargs)
-        triggers a DeprecationWarning. 
-    """ 
-    warningmodule = py.std.warnings
-    l = []
-    oldwarn_explicit = getattr(warningmodule, 'warn_explicit')
-    def warn_explicit(*args, **kwargs): 
-        l.append(args) 
-        oldwarn_explicit(*args, **kwargs)
-    oldwarn = getattr(warningmodule, 'warn')
-    def warn(*args, **kwargs): 
-        l.append(args) 
-        oldwarn(*args, **kwargs)
-        
-    warningmodule.warn_explicit = warn_explicit
-    warningmodule.warn = warn
-    try:
-        ret = func(*args, **kwargs)
-    finally:
-        warningmodule.warn_explicit = warn_explicit
-        warningmodule.warn = warn
-    if not l:
-        #print warningmodule
-        raise AssertionError("%r did not produce DeprecationWarning" %(func,))
-    return ret
 
 # exitcodes for the command line
 EXIT_OK = 0