Fix failing tests

Author: varkor

src/test/run-pass/cross-crate/auxiliary/cci_capture_clause.rs

@@ -4,7 +4,7 @@ use std::sync::mpsc::{Receiver, channel};
 pub fn foo<T:'static + Send + Clone>(x: T) -> Receiver<T> {
     let (tx, rx) = channel();
     thread::spawn(move|| {
-        tx.send(x.clone());
+        let _ = tx.send(x.clone());
     });
     rx
 }

src/test/run-pass/issues/auxiliary/issue-2723-a.rs

@@ -1,3 +1,3 @@
 pub unsafe fn f(xs: Vec<isize> ) {
-    xs.iter().map(|_x| { unsafe fn q() { panic!(); } }).collect::<Vec<()>>();
+    let _ = xs.iter().map(|_x| { unsafe fn q() { panic!(); } }).collect::<Vec<()>>();
 }

src/test/run-pass/issues/auxiliary/issue-9906.rs

@@ -10,6 +10,6 @@ mod other {
     }
 
     pub fn foo(){
-        1+1;
+        let _ = 1 + 1;
     }
 }