runtime·MCentral_FreeSpan  472 src/pkg/runtime/malloc.h bool	runtime·MCentral_FreeSpan(MCentral *c, MSpan *s, int32 n, MLink *start, MLink *end);
runtime·MCentral_FreeSpan 1956 src/pkg/runtime/mgc0.c 		res = runtime·MCentral_FreeSpan(&runtime·mheap.central[cl], s, nfree, head.next, end);