Merge branch 'unused-must-use' into 'master'

add unused_must_use lint

See merge request redox-os/relibc!996

src/platform/mod.rs

@@ -108,14 +108,14 @@ impl FileWriter {
 
 impl fmt::Write for FileWriter {
     fn write_str(&mut self, s: &str) -> fmt::Result {
-        self.write(s.as_bytes());
+        if let Ok(()) = self.write(s.as_bytes()) {}; // TODO handle error
         Ok(())
     }
 }
 
 impl WriteByte for FileWriter {
     fn write_u8(&mut self, byte: u8) -> fmt::Result {
-        self.write(&[byte]);
+        if let Ok(()) = self.write(&[byte]) {}; // TODO handle error
         Ok(())
     }
 }

src/platform/redox/ptrace.rs

@@ -167,7 +167,7 @@ unsafe fn inner_ptrace(
         | sys_ptrace::PTRACE_SYSCALL
         | sys_ptrace::PTRACE_SYSEMU
         | sys_ptrace::PTRACE_SYSEMU_SINGLESTEP => {
-            Sys::kill(pid, signal::SIGCONT as _);
+            if let Ok(()) = Sys::kill(pid, signal::SIGCONT as _) {}; // TODO handle error
 
             // TODO: Translate errors
             let syscall = syscall::PTRACE_STOP_PRE_SYSCALL | syscall::PTRACE_STOP_POST_SYSCALL;