Add #[must_use] to is_condition tests

A continuation of #89718.

library/std/src/path.rs

@@ -215,6 +215,7 @@ impl<'a> Prefix<'a> {
     /// assert!(!Disk(b'C').is_verbatim());
     /// ```
     #[inline]
+    #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn is_verbatim(&self) -> bool {
         use self::Prefix::*;
@@ -247,6 +248,7 @@ impl<'a> Prefix<'a> {
 /// assert!(path::is_separator('/')); // '/' works for both Unix and Windows
 /// assert!(!path::is_separator('❤'));
 /// ```
+#[must_use]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub fn is_separator(c: char) -> bool {
     c.is_ascii() && is_sep_byte(c as u8)
@@ -2011,6 +2013,7 @@ impl Path {
     ///
     /// [`has_root`]: Path::has_root
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use]
     #[allow(deprecated)]
     pub fn is_absolute(&self) -> bool {
         if cfg!(target_os = "redox") {
@@ -2035,6 +2038,7 @@ impl Path {
     ///
     /// [`is_absolute`]: Path::is_absolute
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use]
     #[inline]
     pub fn is_relative(&self) -> bool {
         !self.is_absolute()
@@ -2061,6 +2065,7 @@ impl Path {
     /// assert!(Path::new("/etc/passwd").has_root());
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use]
     #[inline]
     pub fn has_root(&self) -> bool {
         self.components().has_root()
@@ -2698,6 +2703,7 @@ impl Path {
     /// a Unix-like system for example. See [`fs::File::open`] or
     /// [`fs::OpenOptions::open`] for more information.
     #[stable(feature = "path_ext", since = "1.5.0")]
+    #[must_use]
     pub fn is_file(&self) -> bool {
         fs::metadata(self).map(|m| m.is_file()).unwrap_or(false)
     }
@@ -2724,6 +2730,7 @@ impl Path {
     /// check errors, call [`fs::metadata`] and handle its [`Result`]. Then call
     /// [`fs::Metadata::is_dir`] if it was [`Ok`].
     #[stable(feature = "path_ext", since = "1.5.0")]
+    #[must_use]
     pub fn is_dir(&self) -> bool {
         fs::metadata(self).map(|m| m.is_dir()).unwrap_or(false)
     }
@@ -2750,6 +2757,7 @@ impl Path {
     /// assert_eq!(link_path.exists(), false);
     /// ```
     #[unstable(feature = "is_symlink", issue = "85748")]
+    #[must_use]
     pub fn is_symlink(&self) -> bool {
         fs::symlink_metadata(self).map(|m| m.is_symlink()).unwrap_or(false)
     }