diff --git a/src/librustc_expand/mbe/macro_rules.rs b/src/librustc_expand/mbe/macro_rules.rs
index 1628d8bfdbc..3de2169f114 100644
--- a/src/librustc_expand/mbe/macro_rules.rs
+++ b/src/librustc_expand/mbe/macro_rules.rs
@@ -258,7 +258,7 @@ fn generic_extension<'cx>(
                     trace_macros_note(&mut cx.expansions, sp, msg);
                 }
 
-                let mut p = Parser::new(cx.parse_sess(), tts, false, None);
+                let mut p = Parser::new(sess, tts, false, None);
                 p.root_module_name =
                     cx.current_expansion.module.mod_path.last().map(|id| id.to_string());
                 p.last_type_ascription = cx.current_expansion.prior_type_ascription;
@@ -1204,7 +1204,7 @@ fn quoted_tt_to_string(tt: &mbe::TokenTree) -> String {
     }
 }
 
-fn parser_from_cx<'cx>(sess: &'cx ParseSess, tts: TokenStream) -> Parser<'cx> {
+fn parser_from_cx(sess: &ParseSess, tts: TokenStream) -> Parser<'_> {
     Parser::new(sess, tts, true, rustc_parse::MACRO_ARGUMENTS)
 }
 
diff --git a/src/librustc_parse/lib.rs b/src/librustc_parse/lib.rs
index a23f74a8894..c31cc1b4c9f 100644
--- a/src/librustc_parse/lib.rs
+++ b/src/librustc_parse/lib.rs
@@ -238,21 +238,6 @@ pub fn stream_to_parser<'a>(
     Parser::new(sess, stream, false, subparser_name)
 }
 
-/// Given a stream, the `ParseSess` and the base directory, produces a parser.
-///
-/// Use this function when you are creating a parser from the token stream
-/// and also care about the current working directory of the parser (e.g.,
-/// you are trying to resolve modules defined inside a macro invocation).
-///
-/// # Note
-///
-/// The main usage of this function is outside of rustc, for those who uses
-/// librustc_ast as a library. Please do not remove this function while refactoring
-/// just because it is not used in rustc codebase!
-pub fn stream_to_parser_with_base_dir(sess: &ParseSess, stream: TokenStream) -> Parser<'_> {
-    Parser::new(sess, stream, false, None)
-}
-
 /// Runs the given subparser `f` on the tokens of the given `attr`'s item.
 pub fn parse_in<'a, T>(
     sess: &'a ParseSess,