How do I make python give an output when my turtle is in a specific range on the canvas?

Question

I'm pretty new to programming and I was making a simple turtle game for a programming class. I wanted to expand my current program which uses turtle graphics, so that when the turtle that the user moves gets to the 'treasure' or the crate, python outputs a "You win!" command. Here is my code: import turtle

def theTreasure(t):
    # move to position
    t.penup()
    x = 150
    y = 200
    t.setpos(x, y)  # Sets the position of the turtle
    t.setheading(270)
    t.pendown()
    t.color("maroon")

    t.begin_fill()

    for n in range(4):
        t.forward(100)
        t.left(90)

    t.end_fill()

    t.penup()
    x = 160
    y = 190
    t.setpos(x, y)  # Sets the position of the turtle
    t.setheading(270)
    t.pendown()
    t.color("peru")

    t.begin_fill()

    for n in range(4):
        t.forward(80)
        t.left(90)

    t.end_fill()

    t.color("black")
    t.pensize(10)

    t.left(45)
    t.forward(113)

    t.penup()
    t.right(220)
    t.forward(80)

    t.pendown()
    t.left(130)
    t.forward(113)


def player(s):
    s.setpos(0, 0)
    s.shape("triangle")
    s.color("orange")
    s.left(90)


def printControls():
    print("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~")
    print("~  Player Controls ")
    print("~  W: Forward")
    print("~  A: Right")
    print("~  S: Backward")
    print("~  D: Left")
    print("~  R: Quit")
    print("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~")
    print("Remember, you must get to the crate!")


def forwardControl(s):
    s.forward(20)


def backwardControl(s):
    s.right(180)
    s.forward(20)


def rightControl(s):
    s.right(45)


def leftControl(s):
    s.left(45)


def endGame():
    print("Thanks for playing!")


def main():
    t = turtle.Turtle()
    s = turtle.Turtle()
    t.speed(40)

    theTreasure(t)
    player(s)
    printControls()

    movement = "L"

    while (movement != "R"):

        movement = input("Look at the controls. Which way would you like to go? Select W, A, S, or D.")

        if (movement == "W"):
            forwardControl(s)
        elif (movement == "S"):
            backwardControl(s)
        elif (movement == "A"):
            rightControl(s)
        elif (movement == "D"):
            leftControl(s)
        elif (movement == "R"):
            endGame()
        else:
            print("Not a control option!")


main()