From 7d7969d065c438399cde2ebdcd411e5225a31b88 Mon Sep 17 00:00:00 2001
From: Mazdak Farrokhzad <twingoow@gmail.com>
Date: Tue, 8 Oct 2019 09:06:07 +0200
Subject: syntax: extract parse_derive_paths

---
 src/libsyntax/parse/parser/path.rs | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

(limited to 'src/libsyntax/parse/parser')

diff --git a/src/libsyntax/parse/parser/path.rs b/src/libsyntax/parse/parser/path.rs
index ca823991a2e..1f48cc75304 100644
--- a/src/libsyntax/parse/parser/path.rs
+++ b/src/libsyntax/parse/parser/path.rs
@@ -111,7 +111,7 @@ impl<'a> Parser<'a> {
     /// Like `parse_path`, but also supports parsing `Word` meta items into paths for
     /// backwards-compatibility. This is used when parsing derive macro paths in `#[derive]`
     /// attributes.
-    pub fn parse_path_allowing_meta(&mut self, style: PathStyle) -> PResult<'a, Path> {
+    fn parse_path_allowing_meta(&mut self, style: PathStyle) -> PResult<'a, Path> {
         let meta_ident = match self.token.kind {
             token::Interpolated(ref nt) => match **nt {
                 token::NtMeta(ref item) => match item.tokens.is_empty() {
@@ -129,6 +129,21 @@ impl<'a> Parser<'a> {
         self.parse_path(style)
     }
 
+    /// Parse a list of paths inside `#[derive(path_0, ..., path_n)]`.
+    crate fn parse_derive_paths(&mut self) -> PResult<'a, Vec<Path>> {
+        self.expect(&token::OpenDelim(token::Paren))?;
+        let mut list = Vec::new();
+        while !self.eat(&token::CloseDelim(token::Paren)) {
+            let path = self.parse_path_allowing_meta(PathStyle::Mod)?;
+            list.push(path);
+            if !self.eat(&token::Comma) {
+                self.expect(&token::CloseDelim(token::Paren))?;
+                break
+            }
+        }
+        Ok(list)
+    }
+
     crate fn parse_path_segments(
         &mut self,
         segments: &mut Vec<PathSegment>,
-- 
cgit 1.4.1-3-g733a5