< internal/itoa
< internal/unsafeheader
< runtime/internal/sys
+ < runtime/internal/syscall
< runtime/internal/atomic
< runtime/internal/math
< runtime
< go/build;
DEBUG, go/build, go/types, text/scanner
+ < internal/pkgbits
< go/internal/gcimporter, go/internal/gccgoimporter, go/internal/srcimporter
< go/importer;