Rollup merge of rust-lang#145233 - joshtriplett:cfg-select-expr, r=jieyouxu

cfg_select: Support unbraced expressions

Tracking issue for `cfg_select`: rust-lang#115585

When operating on expressions, `cfg_select!` can now handle expressions
without braces. (It still requires braces for other things, such as
items.)

Expand the test coverage and documentation accordingly.

---

I'm not sure whether deciding to extend `cfg_select!` in this way is T-lang or T-libs-api. I've labeled for both, with the request that both teams don't block on each other. :)

Author: Kobzol

core/src/macros/mod.rs

@@ -223,13 +223,14 @@ pub macro assert_matches {
 /// }
 /// ```
 ///
-/// The `cfg_select!` macro can also be used in expression position:
+/// The `cfg_select!` macro can also be used in expression position, with or without braces on the
+/// right-hand side:
 ///
 /// ```
 /// #![feature(cfg_select)]
 ///
 /// let _some_string = cfg_select! {
-///     unix => { "With great power comes great electricity bills" }
+///     unix => "With great power comes great electricity bills",
 ///     _ => { "Behind every successful diet is an unwatched pizza" }
 /// };
 /// ```