Addresses review comments.

Author: mordante

libcxx/include/__chrono/tai_clock.h

@@ -48,7 +48,11 @@ using tai_seconds = tai_time<seconds>;
 //    initial 10s offset).
 //
 // Note this does not specify what the UTC offset before 1958-01-01 00:00:00
-// TAI is. However the member functions are fully specified in the standard.
+// TAI is, nor does it follow the "real" TAI clock between 1958-01-01 and the
+// start of the UTC epoch. So while the member functions are fully specified in
+// the standard, they do not technically follow the "real-world" TAI clock with
+// 100% accuracy.
+//
 // https://koka-lang.github.io/koka/doc/std_time_utc.html contains more
 // information and references.
 class tai_clock {

libcxx/test/std/time/time.clock/time.clock.tai/tai_time.ostream.pass.cpp

@@ -21,7 +21,7 @@
 
 // <chrono>
 
-// class taitem_clock;
+// class tai_clock;
 
 // template<class charT, class traits, class Duration>
 //   basic_ostream<charT, traits>&

libcxx/test/std/time/time.clock/time.clock.tai/time.clock.tai.members/from_utc.pass.cpp

@@ -156,4 +156,6 @@ int main(int, const char**) {
   test_known_values();
   test_transitions();
   test_return_type();
+
+  return 0;
 }

libcxx/test/std/time/time.clock/time.clock.tai/time.clock.tai.members/now.pass.cpp

@@ -28,4 +28,6 @@ int main(int, const char**) {
 
   assert(t >= clock::time_point::min());
   assert(t <= clock::time_point::max());
+
+  return 0;
 }

libcxx/test/std/time/time.clock/time.clock.tai/time.clock.tai.members/to_utc.pass.cpp

@@ -158,4 +158,6 @@ int main(int, const char**) {
   test_known_values();
   test_transitions();
   test_return_type();
+
+  return 0;
 }