Use the correct interface types.

Note: this means the PR cannot be merged until ipld/go-ipld-prime#143 is merged and a version of ipld-prime exists

cid.go

@@ -28,6 +28,7 @@ import (
 	"io"
 	"strings"
 
+	"github.com/ipld/go-ipld-prime"
 	mbase "github.com/multiformats/go-multibase"
 	mh "github.com/multiformats/go-multihash"
 	varint "github.com/multiformats/go-varint"
@@ -549,7 +550,7 @@ func (c Cid) Prefix() Prefix {
 
 // Prototype returns the IPLD LinkPrototype which carries the information
 // to make more Link values similar to this one (but with different hashes).
-func (c Cid) Prototype() Prefix {
+func (c Cid) Prototype() ipld.LinkPrototype {
 	return c.Prefix()
 }
 
@@ -599,7 +600,7 @@ func (p Prefix) Sum(data []byte) (Cid, error) {
 // and allows Prefix to satisfy the LinkPrototype interface.
 // If the hash or prefix state is invalid, `Cid.Undef` will be
 // returned. For a more specific error, use `Sum`.
-func (p Prefix) BuildLink(hashsum []byte) Cid {
+func (p Prefix) BuildLink(hashsum []byte) ipld.Link {
 	c, _ := p.Sum(hashsum)
 	return c
 }

go.mod

@@ -1,6 +1,9 @@
 module github.com/ipfs/go-cid
 
 require (
+	github.com/gxed/hashland/keccakpg v0.0.1 // indirect
+	github.com/gxed/hashland/murmur3 v0.0.1 // indirect
+	github.com/ipld/go-ipld-prime v0.7.1-0.20210225173718-8fef5312eb12 // indirect
 	github.com/multiformats/go-multibase v0.0.3
 	github.com/multiformats/go-multihash v0.0.14
 	github.com/multiformats/go-varint v0.0.6

go.sum

@@ -1,28 +1,47 @@
+github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
+github.com/gxed/hashland/keccakpg v0.0.1/go.mod h1:kRzw3HkwxFU1mpmPP8v1WyQzwdGfmKFJ6tItnhQ67kU=
+github.com/gxed/hashland/murmur3 v0.0.1/go.mod h1:KjXop02n4/ckmZSnY2+HKcLud/tcmvhST0bie/0lS48=
+github.com/ipfs/go-cid v0.0.4/go.mod h1:4LLaPOQwmk5z9LBgQnpkivrx8BJjUyGwTXCd5Xfj6+M=
+github.com/ipld/go-ipld-prime v0.7.1-0.20210225173718-8fef5312eb12 h1:O9VMUYa2ktly9ql6W0LG0k8lXqg3bqz2ZfbaHXN3law=
+github.com/ipld/go-ipld-prime v0.7.1-0.20210225173718-8fef5312eb12/go.mod h1:0xEgdD6MKbZ1vF0GC+YcR/C4SQCAlRuOjIJ2i0HxqzM=
+github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
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 github.com/minio/sha256-simd v0.1.1-0.20190913151208-6de447530771 h1:MHkK1uRtFbVqvAgvWxafZe54+5uBxLluGylDiKgdhwo=
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 github.com/mr-tron/base58 v1.1.0/go.mod h1:xcD2VGqlgYjBdcBLw+TuYLr8afG+Hj8g2eTVqeSzSU8=
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