* doc/lispref/control.texi (Destructuring with pcase Patterns):
Document pcase-lambda (bug#20268).
@var{value} according to its respective @var{pattern}.
@end defmac
+@defmac pcase-lambda lambda-list &rest body
+This is like @code{lambda}, but allows each argument to be a pattern.
+For instance, here's a simple function that takes a cons cell as the
+argument:
+
+@example
+(setq fun
+ (pcase-lambda (`(,key . ,val))
+ (vector key (* val 10))))
+(funcall fun '(foo . 2))
+ @result{} [foo 20]
+@end example
+@end defmac
+
@node Iteration
@section Iteration
@cindex iteration