From 83fae11a12bbe25b998937ef3e9bfcec558e01de Mon Sep 17 00:00:00 2001
From: lukas <lukas.walter@aceart.de>
Date: Thu, 4 Jul 2024 16:47:20 +0200
Subject: [PATCH] Mark format! with must_use hint

---
 tests/pass/intptrcast.rs    | 4 ++--
 tests/pass/packed_struct.rs | 2 +-
 tests/pass/shims/fs.rs      | 4 ++--
 tests/pass/shims/io.rs      | 2 +-
 tests/pass/vecdeque.rs      | 4 ++--
 5 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/tests/pass/intptrcast.rs b/tests/pass/intptrcast.rs
index 4e9fa12c18..fb1a1dfae5 100644
--- a/tests/pass/intptrcast.rs
+++ b/tests/pass/intptrcast.rs
@@ -35,7 +35,7 @@ fn cast_dangling() {
 fn format() {
     // Pointer string formatting! We can't check the output as it changes when libstd changes,
     // but we can make sure Miri does not error.
-    format!("{:?}", &mut 13 as *mut _);
+    let _ = format!("{:?}", &mut 13 as *mut _);
 }
 
 fn transmute() {
@@ -52,7 +52,7 @@ fn ptr_bitops1() {
     let one = bytes.as_ptr().wrapping_offset(1);
     let three = bytes.as_ptr().wrapping_offset(3);
     let res = (one as usize) | (three as usize);
-    format!("{}", res);
+    let _ = format!("{}", res);
 }
 
 fn ptr_bitops2() {
diff --git a/tests/pass/packed_struct.rs b/tests/pass/packed_struct.rs
index b86235e0c6..039eb5adef 100644
--- a/tests/pass/packed_struct.rs
+++ b/tests/pass/packed_struct.rs
@@ -138,7 +138,7 @@ fn test_derive() {
     assert_eq!(x.partial_cmp(&y).unwrap(), x.cmp(&y));
     x.hash(&mut DefaultHasher::new());
     P::default();
-    format!("{:?}", x);
+    let _ = format!("{:?}", x);
 }
 
 fn main() {
diff --git a/tests/pass/shims/fs.rs b/tests/pass/shims/fs.rs
index 35980fad15..16d3e8cab3 100644
--- a/tests/pass/shims/fs.rs
+++ b/tests/pass/shims/fs.rs
@@ -202,7 +202,7 @@ fn test_errors() {
     // Opening a non-existing file should fail with a "not found" error.
     assert_eq!(ErrorKind::NotFound, File::open(&path).unwrap_err().kind());
     // Make sure we can also format this.
-    format!("{0}: {0:?}", File::open(&path).unwrap_err());
+    let _ = format!("{0}: {0:?}", File::open(&path).unwrap_err());
     // Removing a non-existing file should fail with a "not found" error.
     assert_eq!(ErrorKind::NotFound, remove_file(&path).unwrap_err().kind());
     // Reading the metadata of a non-existing file should fail with a "not found" error.
@@ -301,5 +301,5 @@ fn test_from_raw_os_error() {
     let error = Error::from_raw_os_error(code);
     assert!(matches!(error.kind(), ErrorKind::Uncategorized));
     // Make sure we can also format this.
-    format!("{error:?}");
+    let _ = format!("{error:?}");
 }
diff --git a/tests/pass/shims/io.rs b/tests/pass/shims/io.rs
index d20fc75b79..420ef95a0c 100644
--- a/tests/pass/shims/io.rs
+++ b/tests/pass/shims/io.rs
@@ -15,5 +15,5 @@ fn main() {
         panic!("unsupported OS")
     };
     let err = io::Error::from_raw_os_error(raw_os_error);
-    format!("{err}: {err:?}");
+    let _ = format!("{err}: {err:?}");
 }
diff --git a/tests/pass/vecdeque.rs b/tests/pass/vecdeque.rs
index 77c4ca5a04..9153c428e1 100644
--- a/tests/pass/vecdeque.rs
+++ b/tests/pass/vecdeque.rs
@@ -31,8 +31,8 @@ fn main() {
     }
 
     // Regression test for Debug impl's
-    format!("{:?} {:?}", dst, dst.iter());
-    format!("{:?}", VecDeque::<u32>::new().iter());
+    let _ = format!("{:?} {:?}", dst, dst.iter());
+    let _ = format!("{:?}", VecDeque::<u32>::new().iter());
 
     for a in dst {
         assert_eq!(*a, 2);