diff --git a/compiler/rustc_expand/src/mbe/macro_parser.rs b/compiler/rustc_expand/src/mbe/macro_parser.rs
index 74b8450f756..63aac64989d 100644
--- a/compiler/rustc_expand/src/mbe/macro_parser.rs
+++ b/compiler/rustc_expand/src/mbe/macro_parser.rs
@@ -77,7 +77,6 @@ use crate::mbe::{KleeneOp, TokenTree};
 
 use rustc_ast::token::{self, DocComment, Nonterminal, NonterminalKind, Token};
 use rustc_parse::parser::{NtOrTt, Parser};
-use rustc_session::parse::ParseSess;
 use rustc_span::symbol::MacroRulesNormalizedIdent;
 use rustc_span::Span;
 
@@ -128,9 +127,8 @@ pub(super) enum MatcherLoc {
     Eof,
 }
 
-pub(super) fn compute_locs(sess: &ParseSess, matcher: &[TokenTree]) -> Vec<MatcherLoc> {
+pub(super) fn compute_locs(matcher: &[TokenTree]) -> Vec<MatcherLoc> {
     fn inner(
-        sess: &ParseSess,
         tts: &[TokenTree],
         locs: &mut Vec<MatcherLoc>,
         next_metavar: &mut usize,
@@ -147,7 +145,7 @@ pub(super) fn compute_locs(sess: &ParseSess, matcher: &[TokenTree]) -> Vec<Match
 
                     locs.push(MatcherLoc::Delimited);
                     locs.push(MatcherLoc::Token { token: open_token });
-                    inner(sess, &delimited.tts, locs, next_metavar, seq_depth);
+                    inner(&delimited.tts, locs, next_metavar, seq_depth);
                     locs.push(MatcherLoc::Token { token: close_token });
                 }
                 TokenTree::Sequence(_, seq) => {
@@ -162,7 +160,7 @@ pub(super) fn compute_locs(sess: &ParseSess, matcher: &[TokenTree]) -> Vec<Match
                     let op = seq.kleene.op;
                     let idx_first = locs.len();
                     let idx_seq = idx_first - 1;
-                    inner(sess, &seq.tts, locs, next_metavar, seq_depth + 1);
+                    inner(&seq.tts, locs, next_metavar, seq_depth + 1);
 
                     if let Some(separator) = &seq.separator {
                         locs.push(MatcherLoc::SequenceSep { separator: separator.clone() });
@@ -197,7 +195,7 @@ pub(super) fn compute_locs(sess: &ParseSess, matcher: &[TokenTree]) -> Vec<Match
 
     let mut locs = vec![];
     let mut next_metavar = 0;
-    inner(sess, matcher, &mut locs, &mut next_metavar, /* seq_depth */ 0);
+    inner(matcher, &mut locs, &mut next_metavar, /* seq_depth */ 0);
 
     // A final entry is needed for eof.
     locs.push(MatcherLoc::Eof);
diff --git a/compiler/rustc_expand/src/mbe/macro_rules.rs b/compiler/rustc_expand/src/mbe/macro_rules.rs
index ef174c3c45e..009b6bb1505 100644
--- a/compiler/rustc_expand/src/mbe/macro_rules.rs
+++ b/compiler/rustc_expand/src/mbe/macro_rules.rs
@@ -435,7 +435,7 @@ pub fn compile_declarative_macro(
         ),
     ];
     // Convert it into `MatcherLoc` form.
-    let argument_gram = mbe::macro_parser::compute_locs(&sess.parse_sess, &argument_gram);
+    let argument_gram = mbe::macro_parser::compute_locs(&argument_gram);
 
     let parser = Parser::new(&sess.parse_sess, body, true, rustc_parse::MACRO_ARGUMENTS);
     let mut tt_parser =
@@ -540,7 +540,7 @@ pub fn compile_declarative_macro(
                 // Ignore the delimiters around the matcher.
                 match lhs {
                     mbe::TokenTree::Delimited(_, delimited) => {
-                        mbe::macro_parser::compute_locs(&sess.parse_sess, &delimited.tts)
+                        mbe::macro_parser::compute_locs(&delimited.tts)
                     }
                     _ => sess.parse_sess.span_diagnostic.span_bug(def.span, "malformed macro lhs"),
                 }