Implement import renaming with _ (RFC 2166)

2018-03-11 00:18:05 +03:00
parent fab632f975
commit 12ac032c72
6 changed files with 153 additions and 1 deletions
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -7040,7 +7040,11 @@ impl<'a> Parser<'a> {

    fn parse_rename(&mut self) -> PResult<'a, Option<Ident>> {
        if self.eat_keyword(keywords::As) {
-            self.parse_ident().map(Some)
+            if self.eat(&token::Underscore) {
+                Ok(Some(Ident::with_empty_ctxt(Symbol::gensym("_"))))
+            } else {
+                self.parse_ident().map(Some)
+            }
        } else {
            Ok(None)
        }