Add set literals.

Clarify that the new string type will be 'str'.

pep-3100.txt

@@ -104,6 +104,12 @@ Core language
   and semantics is evil.
 * Attributes on functions of the form ``func_whatever`` will be renamed
   ``__whatever__`` [25]_
+* Set literals and comprehensions [27]_
+  {/} means set(); {x} means set([x]); {x, y} means set([x, y]).
+  {F(x) for x in S if P(x)} means set(F(x) for x in S if P(x)).
+  NB. {range(x)} means set([range(x)]), NOT set(range(x)).
+  There's no frozenset literal; they are too rarely needed.
+  The {/} part is still controversial.
 
 To be removed:
 
@@ -129,6 +135,7 @@ Atomic Types
 * Remove distinction between int and long types [1]_
   (int may become an abstract base type, with short and long subtypes.)
 * Make all strings be Unicode, and have a separate bytes() type [1]_
+  The new string type will be called 'str'.
 * Return iterators instead of lists where appropriate for atomic type methods
   (e.g. ``dict.keys()``, ``dict.values()``, ``dict.items()``, etc.); iter*
   methods will be removed
@@ -307,6 +314,9 @@ References
 .. [26] python-3000 email ("More wishful thinking")
    http://mail.python.org/pipermail/python-3000/2006-April/000810.html
 
+   [27] python-3000 email ("sets in P3K?")
+   http://mail.python.org/pipermail/python-3000/2006-April/001286.html
+
 .. [#pep238] PEP 238 (Changing the Division Operator)
    http://www.python.org/dev/peps/pep-0238