Rename is_empty to has_been_invoked

Author: ecstatic-morse

src/librustc_mir/const_eval.rs

@@ -517,7 +517,7 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir,
         // Emit a warning if this is the first time we have triggered the loop detector. This means
         // we have been executing for quite some time.
         let span = ecx.frame().span;
-        if ecx.machine.loop_detector.is_empty() {
+        if !ecx.machine.loop_detector.has_been_invoked() {
             // FIXME(#49980): make this warning a lint
             ecx.tcx.sess.span_warn(span,
                 "Constant evaluating a complex constant, this might take some time");

src/librustc_mir/interpret/snapshot.rs

@@ -111,9 +111,8 @@ impl<'mir, 'tcx> InfiniteLoopDetector<'mir, 'tcx> {
         throw_exhaust!(InfiniteLoop)
     }
 
-    /// Returns `true` if the `InfiniteLoopDetector` has not yet been invoked.
-    pub fn is_empty(&self) -> bool {
-        self.hashes.is_empty()
+    pub fn has_been_invoked(&self) -> bool {
+        !self.hashes.is_empty()
     }
 }