Skip on rustfmt::skip as well as rustfmt_skip

README.md

@@ -174,7 +174,7 @@ See [Configurations.md](Configurations.md) for details.
 * For things you do not want rustfmt to mangle, use one of
 
     ```rust
-    #[rustfmt_skip]  // requires nightly and #![feature(custom_attribute)] in crate root
+    #[rustfmt::skip]  // requires nightly Rust and #![feature(tool_attributes)] in crate root
     #[cfg_attr(rustfmt, rustfmt_skip)]  // works in stable
     ```
 * When you run rustfmt, place a file named `rustfmt.toml` or `.rustfmt.toml` in

rustfmt.toml

@@ -0,0 +1,2 @@
+error_on_line_overflow = true
+error_on_unformatted = true

src/utils.rs

@@ -22,8 +22,8 @@ use config::Color;
 use rewrite::RewriteContext;
 use shape::Shape;
 
-// When we get scoped annotations, we should have rustfmt::skip.
-const SKIP_ANNOTATION: &str = "rustfmt_skip";
+const DEPR_SKIP_ANNOTATION: &str = "rustfmt_skip";
+const SKIP_ANNOTATION: &str = "rustfmt::skip";
 
 // Computes the length of a string's last line, minus offset.
 pub fn extra_offset(text: &str, shape: Shape) -> usize {
@@ -212,7 +212,10 @@ pub fn last_line_extendable(s: &str) -> bool {
 #[inline]
 fn is_skip(meta_item: &MetaItem) -> bool {
     match meta_item.node {
-        MetaItemKind::Word => meta_item.name() == SKIP_ANNOTATION,
+        MetaItemKind::Word => {
+            let path_str = meta_item.ident.to_string();
+            path_str == SKIP_ANNOTATION || path_str == DEPR_SKIP_ANNOTATION
+        }
         MetaItemKind::List(ref l) => {
             meta_item.name() == "cfg_attr" && l.len() == 2 && is_skip_nested(&l[1])
         }

tests/target/skip.rs

@@ -1,10 +1,10 @@
 // Test the skip attribute works
 
-#[rustfmt_skip]
+#[rustfmt::skip]
 fn foo() { badly; formatted; stuff
 ; }
 
-#[rustfmt_skip]
+#[rustfmt::skip]
 trait Foo
 {
 fn foo(
@@ -32,7 +32,7 @@ fn issue1346() {
 
 fn skip_on_statements() {
     // Outside block
-    #[rustfmt_skip]
+    #[rustfmt::skip]
     {
         foo; bar;
             // junk
@@ -40,7 +40,7 @@ fn skip_on_statements() {
 
     {
         // Inside block
-        #![rustfmt_skip]
+        #![rustfmt::skip]
         foo; bar;
             // junk
     }
@@ -79,7 +79,7 @@ fn skip_on_statements() {
 }
 
 // Check that the skip attribute applies to other attributes.
-#[rustfmt_skip]
+#[rustfmt::skip]
 #[cfg
 (  a , b
 )]