Leo Famulari writes: > Working on the Go package, I found that the grafting procedure fails in > a way that I don't understand: > > ------ > $ ./pre-inst-env guix build go@1.9 > The following derivation will be built: > /gnu/store/bv30jxzjl7c5z3hk6pmywpzwwrn1hq5m-go-1.9rc1.drv > @ build-started /gnu/store/bv30jxzjl7c5z3hk6pmywpzwwrn1hq5m-go-1.9rc1.drv - x86_64-linux /var/log/guix/drvs/bv//30jxzjl7c5z3hk6pmywpzwwrn1hq5m-go-1.9rc1.drv.bz2 > grafting '/gnu/store/8zbi5rr5q2pxksfgpxq37m60nsa21d3v-go-1.9rc1-doc' -> '/gnu/store/6v24sf0b3hgyc80b4w2yvx1aw03zinw6-go-1.9rc1-doc'... > grafting '/gnu/store/73fvsx0qizcrbajgjwn8mkzkpxa6abx4-go-1.9rc1' -> '/gnu/store/ghg75mjw3csiv9hf7q0cxrm1g0fx5d0k-go-1.9rc1'... > ERROR: In procedure put-bytevector: Value out of range: 0 > builder for `/gnu/store/bv30jxzjl7c5z3hk6pmywpzwwrn1hq5m-go-1.9rc1.drv' failed with exit code 1 > @ build-failed /gnu/store/bv30jxzjl7c5z3hk6pmywpzwwrn1hq5m-go-1.9rc1.drv - 1 builder for `/gnu/store/bv30jxzjl7c5z3hk6pmywpzwwrn1hq5m-go-1.9rc1.drv' failed with exit code 1 > guix build: error: build failed: build of `/gnu/store/bv30jxzjl7c5z3hk6pmywpzwwrn1hq5m-go-1.9rc1.drv' failed I just got a similar, but not quite same error: grafting '/gnu/store/mqlhrs9xj7rdnm3apzj2las4fr84i3gy-git-2.13.4' -> '/gnu/store/7kfijk9k2vq7c9bg6zy2pb2xpzs6s5b0-git-2.13.4'... ERROR: In procedure put-bytevector: Wrong type argument in position 1 (expecting open output port): # This is on 'core-updates'.