How to Extract the Structure of a GoLang Package?

Retrieving the Structure of a Package in Golang

Can we enumerate all structures contained within a GoLang package as a list of names or interfaces?

For instance:

struct := list("fmt")

Expected output:

Formatter
GoStringer
Scanner
State
Stringer

The most optimal approach involves parsing the Go source code (which can be cloned using the command hg clone https://code.google.com/p/go/), specifically extracting the ast.StructType instances.

This process is exemplified in pretty printers:

func (P *Printer) Type(t *AST.Type) int {
    separator := semicolon;

    switch t.form {

    case AST.STRUCT, AST.INTERFACE:
            switch t.form {
            case AST.STRUCT: P.String(t.pos, "struct");
            case AST.INTERFACE: P.String(t.pos, "interface");
            }
            if t.list != nil {
                    P.separator = blank;
                    P.Fields(t.list, t.end);
            }
            separator = none;

Along similar lines, the go/lint tool performs a similar function in lint.go:

    case *ast.StructType:
        for _, f := range v.Fields.List {
            for _, id := range f.Names {
                check(id, "struct field")
            }
        }

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