We made this tool and presented it at GoSF[0] this week. Example links (scroll down to 'Implements ## Go interfaces' or 'Implemented by ## Go types'): * What

We made this tool and presented it at GoSF[0] this week. Example links (scroll down to 'Implements ## Go interfaces' or 'Implemented by ## Go types'): * What types implement http.ResponseWriter? https://sourcegraph.com/code.google.com/p/go/symbols/go/code.google.com/p/go/src/pkg/net/http/ResponseWriter:type https://sourcegraph.com/code.google.com/p/go/symbols/go/code... * What types implement io.Writer? https://sourcegraph.com/code.google.com/p/go/symbols/go/code.google.com/p/go/src/pkg/io/Writer:type https://sourcegraph.com/code.google.com/p/go/symbols/go/code... * What types implement json.Marshaler? https://sourcegraph.com/code.google.com/p/go/symbols/go/code.google.com/p/go/src/pkg/encoding/json/Marshaler:type https://sourcegraph.com/code.google.com/p/go/symbols/go/code... * What types implement http.Handler? https://sourcegraph.com/code.google.com/p/go/symbols/go/code.google.com/p/go/src/pkg/net/http/Handler:type https://sourcegraph.com/code.google.com/p/go/symbols/go/code... * What interfaces does crypto/tls.Conn implement? https://sourcegraph.com/code.google.com/p/go/symbols/go/code.google.com/p/go/src/pkg/crypto/tls/Conn:type https://sourcegraph.com/code.google.com/p/go/symbols/go/code... * What interfaces does *os.File implement? https://sourcegraph.com/code.google.com/p/go/symbols/go/code.google.com/p/go/src/pkg/os/File:type https://sourcegraph.com/code.google.com/p/go/symbols/go/code... It uses go/types for underlying type analysis. There's a bug tracker at https://github.com/sourcegraph/sourcegraph.com/issues https://github.com/sourcegraph/sourcegraph.com/issues if you see any issues. [0] http://www.meetup.com/golangsf/events/146083272/ http://www.meetup.com/golangsf/events/146083272/