Constify most non-trait Duration methods as described in #72440

src/test/ui/consts/duration-consts-2.rs

@@ -0,0 +1,57 @@
+// run-pass
+
+#![feature(const_panic)]
+#![feature(duration_consts_2)]
+#![feature(div_duration)]
+
+use std::time::Duration;
+
+fn duration() {
+    const ZERO : Duration = Duration::new(0, 0);
+    assert_eq!(ZERO, Duration::from_secs(0));
+
+    const ONE : Duration = Duration::new(0, 1);
+    assert_eq!(ONE, Duration::from_nanos(1));
+
+    const MAX : Duration = Duration::new(u64::MAX, 1_000_000_000 - 1);
+
+    const MAX_ADD_ZERO : Option<Duration> = MAX.checked_add(ZERO);
+    assert_eq!(MAX_ADD_ZERO, Some(MAX));
+
+    const MAX_ADD_ONE : Option<Duration> = MAX.checked_add(ONE);
+    assert_eq!(MAX_ADD_ONE, None);
+
+    const ONE_SUB_ONE : Option<Duration> = ONE.checked_sub(ONE);
+    assert_eq!(ONE_SUB_ONE, Some(ZERO));
+
+    const ZERO_SUB_ONE : Option<Duration> = ZERO.checked_sub(ONE);
+    assert_eq!(ZERO_SUB_ONE, None);
+
+    const ONE_MUL_ONE : Option<Duration> = ONE.checked_mul(1);
+    assert_eq!(ONE_MUL_ONE, Some(ONE));
+
+    const MAX_MUL_TWO : Option<Duration> = MAX.checked_mul(2);
+    assert_eq!(MAX_MUL_TWO, None);
+
+    const ONE_DIV_ONE : Option<Duration> = ONE.checked_div(1);
+    assert_eq!(ONE_DIV_ONE, Some(ONE));
+
+    const ONE_DIV_ZERO : Option<Duration> = ONE.checked_div(0);
+    assert_eq!(ONE_DIV_ZERO, None);
+
+    const MAX_AS_F32 : f32 = MAX.as_secs_f32();
+    assert_eq!(MAX_AS_F32, 18446744000000000000.0_f32);
+
+    const MAX_AS_F64 : f64 = MAX.as_secs_f64();
+    assert_eq!(MAX_AS_F64, 18446744073709552000.0_f64);
+
+    const ONE_AS_F32 : f32 = ONE.div_duration_f32(ONE);
+    assert_eq!(ONE_AS_F32, 1.0_f32);
+
+    const ONE_AS_F64 : f64 = ONE.div_duration_f64(ONE);
+    assert_eq!(ONE_AS_F64, 1.0_f64);
+}
+
+fn main() {
+    duration();
+}