From 13f0f49a4eae04178c0f835c3e86865af3ea3088 Mon Sep 17 00:00:00 2001
From: LingMan <LingMan@users.noreply.github.com>
Date: Tue, 13 Oct 2020 01:39:47 +0200
Subject: [PATCH] Drop unneeded `mut`

These parameters don't get modified.
---
 compiler/rustc_ast_pretty/src/pp.rs           | 4 ++--
 compiler/rustc_ast_pretty/src/pprust/state.rs | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/compiler/rustc_ast_pretty/src/pp.rs b/compiler/rustc_ast_pretty/src/pp.rs
index 95f969d7691e..56e769ba6b71 100644
--- a/compiler/rustc_ast_pretty/src/pp.rs
+++ b/compiler/rustc_ast_pretty/src/pp.rs
@@ -390,7 +390,7 @@ impl Printer {
         self.scan_stack.pop_front().unwrap()
     }
 
-    fn scan_top(&mut self) -> usize {
+    fn scan_top(&self) -> usize {
         *self.scan_stack.front().unwrap()
     }
 
@@ -484,7 +484,7 @@ impl Printer {
         self.pending_indentation += amount;
     }
 
-    fn get_top(&mut self) -> PrintStackElem {
+    fn get_top(&self) -> PrintStackElem {
         *self.print_stack.last().unwrap_or({
             &PrintStackElem { offset: 0, pbreak: PrintStackBreak::Broken(Breaks::Inconsistent) }
         })
diff --git a/compiler/rustc_ast_pretty/src/pprust/state.rs b/compiler/rustc_ast_pretty/src/pprust/state.rs
index af8f81327804..029a6cb664dc 100644
--- a/compiler/rustc_ast_pretty/src/pprust/state.rs
+++ b/compiler/rustc_ast_pretty/src/pprust/state.rs
@@ -63,7 +63,7 @@ impl<'a> Comments<'a> {
     }
 
     pub fn trailing_comment(
-        &mut self,
+        &self,
         span: rustc_span::Span,
         next_pos: Option<BytePos>,
     ) -> Option<Comment> {