gistfile1.txt

runtime: garbage collector found invalid heap pointer *(0xc2082a7d18+0x18)=0x1 s=nil
fatal error: invalid heap pointer

runtime stack:
runtime.throw(0xc96243)
        /usr/local/go/src/runtime/panic.go:491 +0xad fp=0x7f9f661cca38 sp=0x7f9f661cca08
scanblock(0xc208251d18, 0x50, 0x9267f4)
        /usr/local/go/src/runtime/mgc0.c:378 +0x551 fp=0x7f9f661ccb78 sp=0x7f9f661cca38
scanframe(0x7f9f661ccc80, 0x0, 0x1)
        /usr/local/go/src/runtime/mgc0.c:740 +0x1c2 fp=0x7f9f661ccbe8 sp=0x7f9f661ccb78
runtime.gentraceback(0x409e55, 0xc208251cb0, 0x0, 0xc2080f9680, 0x0, 0x0, 0x7fffffff, 0x7f9f661ccd30, 0x0, 0x0, ...)
        /usr/local/go/src/runtime/traceback.go:311 +0x7a8 fp=0x7f9f661cccd8 sp=0x7f9f661ccbe8
scanstack(0xc2080f9680)
        /usr/local/go/src/runtime/mgc0.c:777 +0x21c fp=0x7f9f661ccd48 sp=0x7f9f661cccd8
markroot(0xc20800a070, 0x35)
        /usr/local/go/src/runtime/mgc0.c:553 +0xe7 fp=0x7f9f661ccda8 sp=0x7f9f661ccd48
runtime.parfordo(0xc20800a070)
        /usr/local/go/src/runtime/parfor.c:91fatal error: invalid heap pointer