cargo fmt and remove stabilized feature

Author: phansch

clippy_lints/src/explicit_write.rs

@@ -7,10 +7,10 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use crate::rustc_errors::Applicability;
 use crate::rustc::hir::*;
 use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
 use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc_errors::Applicability;
 use crate::syntax::ast::LitKind;
 use crate::utils::{is_expn_of, match_def_path, opt_def_id, resolve_node, span_lint, span_lint_and_sugg};
 use if_chain::if_chain;

clippy_lints/src/lib.rs

@@ -17,7 +17,6 @@
 #![feature(str_escape)]
 #![allow(clippy::missing_docs_in_private_items)]
 #![recursion_limit = "256"]
-#![feature(macro_at_most_once_rep)]
 #![warn(rust_2018_idioms, trivial_casts, trivial_numeric_casts)]
 #![feature(crate_visibility_modifier)]
 #![feature(try_from)]