Auto merge of #50030 - flip1995:rfc2103, r=petrochenkov

Implement tool_attributes feature (RFC 2103)

cc #44690

This is currently just a rebased and compiling (hopefully) version of #47773.

Let's see if travis likes this. I will add the implementation for `tool_lints` this week.

2 files changed, 7 insertions, 6 deletions

diff --git a/src/libsyntax/parse/attr.rs b/src/libsyntax/parse/attr.rs
index 90f08ab1468..cceed589212 100644
--- a/src/libsyntax/parse/attr.rs
+++ b/src/libsyntax/parse/attr.rs
@@ -149,7 +149,7 @@ impl<'a> Parser<'a> {
         };
         Ok(if let Some(meta) = meta {
             self.bump();
-            (ast::Path::from_ident(meta.ident), meta.node.tokens(meta.span))
+            (meta.ident, meta.node.tokens(meta.span))
         } else {
             (self.parse_path(PathStyle::Mod)?, self.parse_tokens())
         })
@@ -225,9 +225,10 @@ impl<'a> Parser<'a> {
         }
 
         let lo = self.span;
-        let ident = self.parse_ident()?;
+        let ident = self.parse_path(PathStyle::Mod)?;
         let node = self.parse_meta_item_kind()?;
-        Ok(ast::MetaItem { ident, node: node, span: lo.to(self.prev_span) })
+        let span = lo.to(self.prev_span);
+        Ok(ast::MetaItem { ident, node, span })
     }
 
     pub fn parse_meta_item_kind(&mut self) -> PResult<'a, ast::MetaItemKind> {
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 324cadc84e8..0e3bced3222 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -1958,16 +1958,16 @@ impl<'a> Parser<'a> {
         let meta_ident = match self.token {
             token::Interpolated(ref nt) => match nt.0 {
                 token::NtMeta(ref meta) => match meta.node {
-                    ast::MetaItemKind::Word => Some(meta.ident),
+                    ast::MetaItemKind::Word => Some(meta.ident.clone()),
                     _ => None,
                 },
                 _ => None,
             },
             _ => None,
         };
-        if let Some(ident) = meta_ident {
+        if let Some(path) = meta_ident {
             self.bump();
-            return Ok(ast::Path::from_ident(ident));
+            return Ok(path);
         }
         self.parse_path(style)
     }