invoke_block_from_c  547 vm.c               return invoke_block_from_c(th, blockptr, blockptr->self, argc, argv, 0, cref);
invoke_block_from_c  554 vm.c               return invoke_block_from_c(th, blockptr, blockptr->self, argc, argv, 0, 0);
invoke_block_from_c  571 vm.c           	val = invoke_block_from_c(th, &proc->block, self, argc, argv, blockptr, 0);