src := `package foo

import (
	"fmt"
	"time"
)

func bar() {
	fmt.Println(time.Now())
}`

	// Parse src but stop after processing the imports.
	f, err := parser.ParseFile(fset, "", src, parser.ImportsOnly)
	if err != nil {
		fmt.Println(err)
		return
	}

	// Print the imports from the file's AST.
	for _, s := range f.Imports {
		fmt.Println(s.Path.Value)
	}

	// output:
	//
	// "fmt"

		func f() string {
			_ = "foo"
			return fmt.Sprintf("%d", g())
		}
		func g() (x int) { return }
		`,
		`
		package p
		import . "go/parser"
		import "sync"
		func h() Mode { return ImportsOnly }
		var _, x int = 1, 2
		func init() {}
		type T struct{ *sync.Mutex; a, b, c int}
		type I interface{ m() }
		var _ = T{a: 1, b: 2, c: 3}
		func (_ T) m() {}
		func (T) _() {}
		var i I
		var _ = i.m

		func f() string {
			_ = "foo"
			return fmt.Sprintf("%d", g())
		}
		func g() (x int) { return }
		`,
		`
		package p
		import . "go/parser"
		import "sync"
		func h() Mode { return ImportsOnly }
		var _, x int = 1, 2
		func init() {}
		type T struct{ *sync.Mutex; a, b, c int}
		type I interface{ m() }
		var _ = T{a: 1, b: 2, c: 3}
		func (_ T) m() {}
		func (T) _() {}
		var i I
		var _ = i.m

// They control the amount of source code parsed and other optional
// parser functionality.
type Mode uint

const (
	PackageClauseOnly    Mode             = 1 << iota // stop parsing after package clause
	ImportsOnly                                       // stop parsing after import declarations
	ParseComments                                     // parse comments and add them to AST

		return r.err
	}

	if info.fset == nil {
		return nil
	}

	// Parse file header & record imports.
	info.parsed, info.parseErr = parser.ParseFile(info.fset, info.name, info.header, parser.ImportsOnly|parser.ParseComments)
	if info.parseErr != nil {
		return nil
	}

	hasEmbed := false
	for _, decl := range info.parsed.Decls {
		d, ok := decl.(*ast.GenDecl)
		if !ok {
			continue
		}

		return r.err
	}

	if info.fset == nil {
		return nil
	}

	// Parse file header & record imports.
	info.parsed, info.parseErr = parser.ParseFile(info.fset, info.name, info.header, parser.ImportsOnly|parser.ParseComments)
	if info.parseErr != nil {
		return nil
	}

	hasEmbed := false
	for _, decl := range info.parsed.Decls {
		d, ok := decl.(*ast.GenDecl)
		if !ok {
			continue
		}

// They control the amount of source code parsed and other optional
// parser functionality.
const (
	PackageClauseOnly uint = 1 << iota // parsing stops after package clause
	ImportsOnly                        // parsing stops after import declarations
	ParseComments                      // parse comments and add them to AST
	Trace                              // print a trace of parsed productions

	var decls []ast.Decl
	if p.mode&PackageClauseOnly == 0 {
		// import decls
		for p.tok == token.IMPORT {
			decls = append(decls, p.parseGenDecl(token.IMPORT, p.parseImportSpec))
		}

		if p.mode&ImportsOnly == 0 {
			// rest of package body
			prev := token.IMPORT
			for p.tok != token.EOF {
				// Continue to accept import declarations for error tolerance, but complain.

		{"Default", Func, 5},
		{"For", Func, 5},
		{"ForCompiler", Func, 12},
		{"Lookup", Type, 5},
	},
	"go/parser": {
		{"AllErrors", Const, 1},
		{"DeclarationErrors", Const, 0},
		{"ImportsOnly", Const, 0},
		{"Mode", Type, 0},
		{"PackageClauseOnly", Const, 0},
		{"ParseComments", Const, 0},
		{"ParseDir", Func, 0},
		{"ParseExpr", Func, 0},
		{"ParseExprFrom", Func, 5},

pkg go/doc, type Value struct, Decl *ast.GenDecl
pkg go/doc, type Value struct, Doc string
pkg go/doc, type Value struct, Names []string
pkg go/parser, const DeclarationErrors Mode
pkg go/parser, const ImportsOnly Mode
pkg go/parser, const PackageClauseOnly Mode
pkg go/parser, const ParseComments Mode
pkg go/parser, const SpuriousErrors Mode
pkg go/parser, const Trace Mode