How to find out which types implement which interface

Question

Example:

In package io the type ByteReader defines an interface that wraps the method ReadByte() (c byte, err error).

What is the

Answer 1

There are now better ways to do this than simply searching.

Go Oracle has an implements query that will show which types implement a particular interface, and which interfaces a particular type implements.

Additionally, here is a tool that claims to offer the same functionality: https://github.com/dominikh/implements.

2020 Update: The official Go language server, gopls, also has support for this query:

    ➜ gopls implementation -h
    display selected identifier's implementation
    
    Usage: implementation [flags] 
    
    Example:
    
      $ # 1-indexed location (:line:column or :#offset) of the target identifier
      $ gopls implementation helper/helper.go:8:6
      $ gopls implementation helper/helper.go:#53