Auto merge of #48925 - zackmdavis:fn_must_stabilize, r=nikomatsakis

stabilize `#[must_use]` for functions and must-use comparison operators (RFC 1940)

r? @nikomatsakis

2 files changed, 4 insertions, 0 deletions

diff --git a/src/libstd/ffi/c_str.rs b/src/libstd/ffi/c_str.rs
index 8164f52d3c3..7c358aafa9b 100644
--- a/src/libstd/ffi/c_str.rs
+++ b/src/libstd/ffi/c_str.rs
@@ -988,6 +988,7 @@ impl CStr {
     /// behavior when `ptr` is used inside the `unsafe` block:
     ///
     /// ```no_run
+    /// # #![allow(unused_must_use)]
     /// use std::ffi::{CString};
     ///
     /// let ptr = CString::new("Hello").unwrap().as_ptr();
@@ -1003,6 +1004,7 @@ impl CStr {
     /// To fix the problem, bind the `CString` to a local variable:
     ///
     /// ```no_run
+    /// # #![allow(unused_must_use)]
     /// use std::ffi::{CString};
     ///
     /// let hello = CString::new("Hello").unwrap();
diff --git a/src/libstd/sync/mpsc/select.rs b/src/libstd/sync/mpsc/select.rs
index a9f3cea243f..9310dad9172 100644
--- a/src/libstd/sync/mpsc/select.rs
+++ b/src/libstd/sync/mpsc/select.rs
@@ -518,6 +518,7 @@ mod tests {
         }
     }
 
+    #[allow(unused_must_use)]
     #[test]
     fn cloning() {
         let (tx1, rx1) = channel::<i32>();
@@ -540,6 +541,7 @@ mod tests {
         tx3.send(()).unwrap();
     }
 
+    #[allow(unused_must_use)]
     #[test]
     fn cloning2() {
         let (tx1, rx1) = channel::<i32>();