In general, identifiers cannot be accurately resolved without type information.
      Consider, for example, the identifier <code>K</code>
      in <code>T{K: ""}</code>: it could be the name of a local variable
      if T is a map type, or the name of a field if T is a struct type.

      New programs should use the <a href='/pkg/go/types'>go/types</a>
      package to resolve identifiers; see