Rollup merge of #78244 - workingjubilee:dogfood-fancy-ranges, r=varkor

Dogfood {exclusive,half-open} ranges in compiler (nfc)

In particular, this allows us to write more explicit matches that
avoid the pitfalls of using a fully general fall-through case, yet
remain fairly ergonomic. Less logic is in guard cases, more is in
the actual exhaustive case analysis.

No functional changes.

compiler/rustc_lint/src/lib.rs

@@ -35,6 +35,8 @@
 #![feature(never_type)]
 #![feature(nll)]
 #![feature(or_patterns)]
+#![feature(half_open_range_patterns)]
+#![feature(exclusive_range_pattern)]
 #![recursion_limit = "256"]
 
 #[macro_use]