sctx              728 src/write.c        ScmWriteContext sctx, actx; /* context for ~s and ~a */
sctx              733 src/write.c        sctx.mode = SCM_WRITE_WRITE;
sctx              734 src/write.c        sctx.flags = 0;
sctx              768 src/write.c                        format_write(arg, out, &sctx, sharedp);