NameError: name 'frame_rate' is not defined

Found while porting Basics / Structure / SetupDraw (see https://github.com/processing/processing-examples-mewnala/issues/110)

Code

"""
Setup and Draw.

The code inside the draw() function runs continuously
from top to bottom until the program is stopped.
"""
from mewnala import *
y = 100


def setup():
    """
    The statements in the setup() function
    execute once when the program begins
    """
    size(640, 360)    # Size must be the first statement
    stroke(255)         # Set line drawing color to white
    frame_rate(30)


def draw():
    """
    The statements in draw() are executed until the
    program is stopped. Each statement is executed in
    sequence and after the last line is read, the first
    line is executed again.
    """
    global y
    background(0)     # Set the background to black
    y = y - 1
    if y < 0:
        y = height

    line(0, y, width, y)
run()

進入點是已發布 Python 範例中的 setup()、draw() 和 run()；首先重現 NameError，並檢查 Rust Processing API 為 frame_rate 匯出的命名。確認問題是由範例還是 API 導致的，然後驗證範例能夠在沒有未定義名稱錯誤的情況下啟動並執行。