Contract
Return type	wob
Parameter key	Default value	Type
include	return_true	var
limit	opt
include_limit	true	boolean
Parameter kind	Default value	Type
Other unkeyed arguments	opt with ekind of expression	wob
Other keyed arguments	opt

Water Contract
<method method.copy include =return_true limit =opt include_limit=true _other_keyed =opt=wob=ekind.code="_add_to_environment" _other_unkeyed=opt=wob=ekind.expression="_body"/>

Creates (and returns) a new method that is the same as the _subject method. The new implementation should be put in the content of call to copy. It is common to use set immediately after copy to change or add additional fields.

<method foo bar=required> bar </>
<set new_foo = foo.<copy/>.<set bar=20/> />
<new_foo/>

Copying a method and changing its arguments is also known as currying.

<method foo bar=10> 
  "hello".<join bar/> 
 </>
<foo/>

"hello10"

<foo.<copy/>.<set bar=20 baz="aaa"/>/>

"hello20"

<foo.<copy> "bye" </> />

"bye"

<foo/>

"hello10"

<method foo bar=10> "hello".<join bar/> </method>.
  <copy/>.<set bar=20/>

<method _name_argument=foo_copy bar=20 "hello".<join bar/>/>