Auto merge of #4625 - phansch:rollup-qp7ki0h, r=phansch

Rollup of 2 pull requests

Successful merges:

 - #4509 (Fix false-positive of redundant_clone and move to clippy::perf)
 - #4614 (Allow casts from the result of `abs` to unsigned)

Failed merges:

changelog: none

r? @ghost

clippy_dev/src/fmt.rs

@@ -100,10 +100,7 @@ pub fn run(check: bool, verbose: bool) {
 }
 
 fn format_command(program: impl AsRef<OsStr>, dir: impl AsRef<Path>, args: &[impl AsRef<OsStr>]) -> String {
-    let arg_display: Vec<_> = args
-        .iter()
-        .map(|a| escape(a.as_ref().to_string_lossy()).to_owned())
-        .collect();
+    let arg_display: Vec<_> = args.iter().map(|a| escape(a.as_ref().to_string_lossy())).collect();
 
     format!(
         "cd {} && {} {}",

clippy_lints/src/booleans.rs

@@ -343,7 +343,7 @@ impl<'a, 'tcx> NonminimalBoolVisitor<'a, 'tcx> {
 
             let stats = terminal_stats(&expr);
             let mut simplified = expr.simplify();
-            for simple in Bool::Not(Box::new(expr.clone())).simplify() {
+            for simple in Bool::Not(Box::new(expr)).simplify() {
                 match simple {
                     Bool::Not(_) | Bool::True | Bool::False => {},
                     _ => simplified.push(Bool::Not(Box::new(simple.clone()))),

clippy_lints/src/lib.rs

@@ -27,6 +27,8 @@ extern crate rustc_driver;
 #[allow(unused_extern_crates)]
 extern crate rustc_errors;
 #[allow(unused_extern_crates)]
+extern crate rustc_index;
+#[allow(unused_extern_crates)]
 extern crate rustc_mir;
 #[allow(unused_extern_crates)]
 extern crate rustc_target;
@@ -864,6 +866,7 @@ pub fn register_plugins(reg: &mut rustc_driver::plugin::Registry<'_>, conf: &Con
         ranges::RANGE_MINUS_ONE,
         ranges::RANGE_PLUS_ONE,
         ranges::RANGE_ZIP_WITH_LEN,
+        redundant_clone::REDUNDANT_CLONE,
         redundant_field_names::REDUNDANT_FIELD_NAMES,
         redundant_pattern_matching::REDUNDANT_PATTERN_MATCHING,
         redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES,
@@ -1169,6 +1172,7 @@ pub fn register_plugins(reg: &mut rustc_driver::plugin::Registry<'_>, conf: &Con
         methods::SINGLE_CHAR_PATTERN,
         misc::CMP_OWNED,
         mutex_atomic::MUTEX_ATOMIC,
+        redundant_clone::REDUNDANT_CLONE,
         slow_vector_initialization::SLOW_VECTOR_INITIALIZATION,
         trivially_copy_pass_by_ref::TRIVIALLY_COPY_PASS_BY_REF,
         types::BOX_VEC,
@@ -1188,7 +1192,6 @@ pub fn register_plugins(reg: &mut rustc_driver::plugin::Registry<'_>, conf: &Con
         mutex_atomic::MUTEX_INTEGER,
         needless_borrow::NEEDLESS_BORROW,
         path_buf_push_overwrite::PATH_BUF_PUSH_OVERWRITE,
-        redundant_clone::REDUNDANT_CLONE,
     ]);
 }