Go print info about all package types

package main

import (
    "fmt"
    "go/ast"
    "golang.org/x/tools/go/packages"
    "reflect"
    "time"
    "unicode"
)

func printTypes(){
    config := &packages.Config{
        Mode:  packages.NeedSyntax,
    }
    // you can use any package, for local package use name defined in go.mod
    pkgs, _ := packages.Load(config, "time")
    pkg := pkgs[0]

    for _, s := range pkg.Syntax {
        for n, o := range s.Scope.Objects {
            if o.Kind == ast.Typ {
                // omit that `if` if you check local types
                if unicode.IsUpper([]rune(n)[0]) {
                    // note that reflect.ValueOf(*new(%s)) won't work with interfaces
                    fmt.Printf("    new(time.%s),\n", n)
                }
            }
        }
    }
}

func printTypesInfo()  {
    for _, p := range []interface{}{
        // this list was generated by printTypes
        new(time.ParseError),
        new(time.Timer),
        new(time.Ticker),
        new(time.Time),
        new(time.Duration),
        new(time.Month),
        new(time.Weekday),
        new(time.Location),
    } {
        // dump info about each type(that's why I googled "get all types in package")
        t := reflect.TypeOf(p).Elem()
        fmt.Println(t.Kind(), t.Name(), t.Size(), t.Align())
        if t.Kind() == reflect.Struct {
            for i :=0;i<t.NumField();i++{
                f := t.Field(i)
                fmt.Println("  ", f.Index, f.Name, f.Type, f.Offset, f.Type.Size())
            }
        }
    }

}

func main() {
    printTypes()
    printTypesInfo()
}
/* output for package time
struct ParseError 80 8
   [0] Layout string 0 16
   [1] Value string 16 16
   [2] LayoutElem string 32 16
   [3] ValueElem string 48 16
   [4] Message string 64 16
struct Timer 80 8
   [0] C <-chan time.Time 0 8
   [1] r time.runtimeTimer 8 72
struct Ticker 80 8
   [0] C <-chan time.Time 0 8
   [1] r time.runtimeTimer 8 72
struct Time 24 8
   [0] wall uint64 0 8
   [1] ext int64 8 8
   [2] loc *time.Location 16 8
int64 Duration 8 8
int Month 8 8
int Weekday 8 8
struct Location 104 8
   [0] name string 0 16
   [1] zone []time.zone 16 24
   [2] tx []time.zoneTrans 40 24
   [3] extend string 64 16
   [4] cacheStart int64 80 8
   [5] cacheEnd int64 88 8
   [6] cacheZone *time.zone 96 8
*/