wall: get mac to infer correct type

Author: 0jdxt

src/uu/wall/src/wall.rs

@@ -317,7 +317,7 @@ fn is_gr_member(user: &[c_char], gid: gid_t) -> bool {
 
     // otherwise check gid is in list of supplementary groups user belongs to
     let mut ngroups = 16;
-    let mut groups: Vec<gid_t> = vec![0; ngroups as usize];
+    let mut groups: Vec<_> = vec![0; ngroups as usize];
     while unsafe {
         libc::getgrouplist(
             user.as_ptr(),

tests/by-util/test_wall.rs

@@ -3,7 +3,9 @@ mod tests {
     use uutests::new_ucmd;
 
     #[test]
-    fn test_invalid_arg() { new_ucmd!().arg("--definitely-invalid").fails().code_is(1); }
+    fn test_invalid_arg() {
+        new_ucmd!().arg("--definitely-invalid").fails().code_is(1);
+    }
 
     #[test]
     fn test_fails_on_invalid_group() {
@@ -46,5 +48,7 @@ mod tests {
     }
 
     #[test]
-    fn test_succeeds_no_stdout() { new_ucmd!().pipe_in("pipe me").succeeds().stdout_is(""); }
+    fn test_succeeds_no_stdout() {
+        new_ucmd!().pipe_in("pipe me").succeeds().stdout_is("");
+    }
 }