CHECK_THREAD     3895 src/eval.c       CHECK_THREAD (thread);
CHECK_THREAD     1452 src/process.c        CHECK_THREAD (thread);
CHECK_THREAD      921 src/thread.c     CHECK_THREAD (thread);
CHECK_THREAD      948 src/thread.c     CHECK_THREAD (thread);
CHECK_THREAD      989 src/thread.c     CHECK_THREAD (thread);
CHECK_THREAD     1006 src/thread.c     CHECK_THREAD (thread);
CHECK_THREAD     1040 src/thread.c     CHECK_THREAD (thread);