Question about basic and person data type

Getting Help
1 
package main
import (
  "fmt"
  "reflect"
)
type TokenType string
type Token struct {
	Type    TokenType
	Literal string
}
const (
	ILLEGAL = "ILLEGAL"
	EOF = "EOF"
	//Identifiers + Literals
	IDENT = "IDENT" //ADD, foorbar, X ,Y ...
	INT = "INT" //1,2,3,4...,N
	//Operators
	ASSIGN = "="
	PLUS = "+"
	//Delimiters
	COMMA = ","
	SEMICOLON = ";"
	LPAREN = "("
	RPAREN = ")"
	LBRACE = "{"
	RBRACE = "}"
	//Keywords
	FUNCTION = "FUNCTION"
	LET = "LET"
)
func main(){
  structure:=Token{
    Type: ILLEGAL,
  }
  fmt.Println(reflect.TypeOf(structure.Type),structure)
}

Can you explain me How ILLEGAL (string) convert to TokenType type ? And when and Where does this automated process repeat? Slicer?Array? Map?
Thank you

2

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