diff options
Diffstat (limited to 'library/std/src/io/util.rs')
| -rw-r--r-- | library/std/src/io/util.rs | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/library/std/src/io/util.rs b/library/std/src/io/util.rs index 2f3520ae7a5..9cd7c514849 100644 --- a/library/std/src/io/util.rs +++ b/library/std/src/io/util.rs @@ -32,6 +32,7 @@ pub struct Empty; /// io::empty().read_to_string(&mut buffer).unwrap(); /// assert!(buffer.is_empty()); /// ``` +#[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_io_structs", issue = "78812")] pub const fn empty() -> Empty { @@ -112,6 +113,7 @@ pub struct Repeat { /// io::repeat(0b101).read_exact(&mut buffer).unwrap(); /// assert_eq!(buffer, [0b101, 0b101, 0b101]); /// ``` +#[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_io_structs", issue = "78812")] pub const fn repeat(byte: u8) -> Repeat { @@ -192,6 +194,7 @@ pub struct Sink; /// let num_bytes = io::sink().write(&buffer).unwrap(); /// assert_eq!(num_bytes, 5); /// ``` +#[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_io_structs", issue = "78812")] pub const fn sink() -> Sink { |