+.B "typedef struct {"
+.B "\h'4n'size_t sz, len, off;"
+.B "\h'4n'unsigned push, unshift;"
+.B "\h'4n'arena *a;"
+.B "} da_base;"
+
+.B "#define DA_INIT ..."
+
+.B "#define DAEXC_UFLOW EXC_ALLOCN(EXC_MLIB, ...)"
+.B "#define DAEXC_OFLOW EXC_ALLOCN(EXC_MLIB, ...)"
+