replace a macro by a function

tests/pass/weak_memory/weak.rs

@@ -72,7 +72,7 @@ fn seq_cst() -> bool {
 
 fn initialization_write() -> bool {
  let x = static_atomic(11);
- assert_eq!(x.load(Relaxed), 11);
+ assert_eq!(x.load(Relaxed), 11); // work around https://github.com/rust-lang/miri/issues/2164
 
  let wait = static_atomic(0);
 
@@ -94,15 +94,13 @@ fn initialization_write() -> bool {
  r2 == 11
 }
 
-// Asserts that the function returns true at least once in 100 runs
-macro_rules! assert_once {
- ($f:ident) => {
- assert!(std::iter::repeat_with(|| $f()).take(100).any(|x| x));
- };
+/// Asserts that the function returns true at least once in 100 runs
+fn assert_once(f: fn() -> bool) {
+ assert!(std::iter::repeat_with(|| f()).take(100).any(|x| x));
 }
 
 pub fn main() {
- assert_once!(relaxed);
- assert_once!(seq_cst);
- assert_once!(initialization_write);
+ assert_once(relaxed);
+ assert_once(seq_cst);
+ assert_once(initialization_write);
 }