Auto merge of #3654 - matthiaskrgr:rustup, r=phansch

rustup: the features if_while_or_patterns has been stabilized

Author: bors

clippy_lints/src/lib.rs

@@ -11,7 +11,6 @@
 #![warn(rust_2018_idioms, trivial_casts, trivial_numeric_casts)]
 #![feature(crate_visibility_modifier)]
 #![feature(try_from)]
-#![feature(if_while_or_patterns)]
 
 // FIXME: switch to something more ergonomic here, once available.
 // (currently there is no way to opt into sysroot crates w/o `extern crate`)