address review comments

src/clock.rs

@@ -1,13 +1,9 @@
-use std::sync::atomic::AtomicU64;
+use std::sync::atomic::{AtomicU64, Ordering};
 use std::time::{Duration, Instant as StdInstant};
 
-use rustc_data_structures::sync::Ordering;
+/// When using a virtual clock, this defines how many nanoseconds we pretend are passing for each
-
+/// basic block.
-use crate::*;
+const NANOSECONDS_PER_BASIC_BLOCK: u64 = 10;
-
-/// When using a virtual clock, this defines how many nanoseconds do we pretend
-/// are passing for each basic block.
-const NANOSECOND_PER_BASIC_BLOCK: u64 = 10;
 
 #[derive(Debug)]
 pub struct Instant {
@@ -83,7 +79,7 @@ impl Clock {
                 // Time will pass without us doing anything.
             }
             ClockKind::Virtual { nanoseconds } => {
-                nanoseconds.fetch_add(NANOSECOND_PER_BASIC_BLOCK, Ordering::SeqCst);
+                nanoseconds.fetch_add(NANOSECONDS_PER_BASIC_BLOCK, Ordering::SeqCst);
             }
         }
     }

src/shims/time.rs

@@ -38,7 +38,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
             [this.eval_libc_i32("CLOCK_MONOTONIC")?, this.eval_libc_i32("CLOCK_MONOTONIC_COARSE")?];
 
         let duration = if absolute_clocks.contains(&clk_id) {
-            this.check_no_isolation("`clock_gettime` with real time clocks")?;
+            this.check_no_isolation("`clock_gettime` with `REALTIME` clocks")?;
             system_time_to_duration(&SystemTime::now())?
         } else if relative_clocks.contains(&clk_id) {
             this.machine.clock.now().duration_since(this.machine.clock.anchor())

tests/pass/shims/time-with-isolation.rs

@@ -8,7 +8,7 @@ fn test_sleep() {
     assert!((after - before).as_secs() >= 3600);
 }
 
-/// Ensure that time passes even if we don't sleep (but just wor).
+/// Ensure that time passes even if we don't sleep (but just work).
 fn test_time_passes() {
     // Check `Instant`.
     let now1 = Instant::now();