Auto merge of #6121 - rschoon:sync-from-rust, r=Manishearth

Sync from rust

Not much to say here, other than it includes an update for a breaking change from rustc_ast

changelog: none

clippy_lints/src/consts.rs

@@ -155,7 +155,7 @@ pub fn lit_to_constant(lit: &LitKind, ty: Option<Ty<'_>>) -> Constant {
     match *lit {
         LitKind::Str(ref is, _) => Constant::Str(is.to_string()),
         LitKind::Byte(b) => Constant::Int(u128::from(b)),
-        LitKind::ByteStr(ref s) => Constant::Binary(Lrc::from(s.as_slice())),
+        LitKind::ByteStr(ref s) => Constant::Binary(Lrc::clone(s)),
         LitKind::Char(c) => Constant::Char(c),
         LitKind::Int(n, _) => Constant::Int(n),
         LitKind::Float(ref is, LitFloatType::Suffixed(fty)) => match fty {

tests/ui/attrs.rs

@@ -3,7 +3,6 @@
 // Test that the whole restriction group is not enabled
 #![warn(clippy::restriction)]
 #![deny(clippy::restriction)]
-#![forbid(clippy::restriction)]
 #![allow(clippy::missing_docs_in_private_items, clippy::panic, clippy::unreachable)]
 
 #[inline(always)]

tests/ui/attrs.stderr

@@ -1,21 +1,21 @@
 error: you have declared `#[inline(always)]` on `test_attr_lint`. This is usually a bad idea
-  --> $DIR/attrs.rs:9:1
+  --> $DIR/attrs.rs:8:1
    |
 LL | #[inline(always)]
    | ^^^^^^^^^^^^^^^^^
    |
    = note: `-D clippy::inline-always` implied by `-D warnings`
 
 error: the since field must contain a semver-compliant version
-  --> $DIR/attrs.rs:29:14
+  --> $DIR/attrs.rs:28:14
    |
 LL | #[deprecated(since = "forever")]
    |              ^^^^^^^^^^^^^^^^^
    |
    = note: `-D clippy::deprecated-semver` implied by `-D warnings`
 
 error: the since field must contain a semver-compliant version
-  --> $DIR/attrs.rs:32:14
+  --> $DIR/attrs.rs:31:14
    |
 LL | #[deprecated(since = "1")]
    |              ^^^^^^^^^^^
@@ -37,13 +37,5 @@ LL | #![deny(clippy::restriction)]
    |
    = help: try enabling only the lints you really need
 
-error: restriction lints are not meant to be all enabled
-  --> $DIR/attrs.rs:6:11
-   |
-LL | #![forbid(clippy::restriction)]
-   |           ^^^^^^^^^^^^^^^^^^^
-   |
-   = help: try enabling only the lints you really need
-
-error: aborting due to 6 previous errors
+error: aborting due to 5 previous errors