ENV_IN_HEAP_P     284 vm.c               if (ENV_IN_HEAP_P(th, envptr)) {
ENV_IN_HEAP_P     292 vm.c           	if (ENV_IN_HEAP_P(th, penvptr)) {
ENV_IN_HEAP_P     381 vm.c               if (ENV_IN_HEAP_P(th, dfp)) {