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()

入口点是已发布 Python 示例中的 setup()、draw() 和 run()；首先重现 NameError，并检查 Rust Processing API 为 frame_rate 导出的命名。确认问题是由示例还是 API 导致的，然后验证示例能够在没有未定义名称错误的情况下启动并运行。