confusing "recursive type" error message #9

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sb10q · 2021-08-25T16:36:24+08:00

sb10q commented

2021-08-25 16:36:24 +08:00

Modify mandelbrot.py as follows:

def run() -> int32:
    minX = -2.0
    maxX = 1.0
    width = 78
    height = 36
    aspectRatio = 2.0

    yScale = (maxX-minX)*(height/width)*aspectRatio

    y = 0
    while y < height:
        x = 0
        while x < width:
            c_r = minX+float(x)*(maxX-minX)/width
            c_i = float(y)*yScale/height-yScale/2.0
            z_r = c_r
            z_i = c_i
            i = 0
            while i < 16:
                if z_r*z_r + z_i*z_i > 4.0:
                    break
                new_z_r = (z_r*z_r)-(z_i*z_i) + c_r
                z_i = 2.0*z_r*z_i + c_i
                z_r = new_z_r
                i = i + 1
            output(i)
            x = x + 1
        output(-1)
        y = y + 1
    return 0

Error:

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: "Recursive type is prohibited. at line 20 column 30"', nac3standalone/src/main.rs:121:10

Modify mandelbrot.py as follows: ```python def run() -> int32: minX = -2.0 maxX = 1.0 width = 78 height = 36 aspectRatio = 2.0 yScale = (maxX-minX)*(height/width)*aspectRatio y = 0 while y < height: x = 0 while x < width: c_r = minX+float(x)*(maxX-minX)/width c_i = float(y)*yScale/height-yScale/2.0 z_r = c_r z_i = c_i i = 0 while i < 16: if z_r*z_r + z_i*z_i > 4.0: break new_z_r = (z_r*z_r)-(z_i*z_i) + c_r z_i = 2.0*z_r*z_i + c_i z_r = new_z_r i = i + 1 output(i) x = x + 1 output(-1) y = y + 1 return 0 ``` Error: ``` thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: "Recursive type is prohibited. at line 20 column 30"', nac3standalone/src/main.rs:121:10 ```

sb10q commented

2021-08-25 16:36:53 +08:00

Poster

Line 20 contains if z_r*z_r + z_i*z_i > 4.0:

Line 20 contains ``if z_r*z_r + z_i*z_i > 4.0:``

pca006132 commented

2021-08-25 16:53:31 +08:00

I guess the reason is just due to float being assigned a type variable, and then the type is messed up later. Should not be hard to fix, would fix this later.

I guess the reason is just due to `float` being assigned a type variable, and then the type is messed up later. Should not be hard to fix, would fix this later.

pca006132 commented

2021-08-27 11:14:33 +08:00

Fixed in a24e204

Fixed in a24e204

pca006132 closed this issue

2021-08-27 11:14:33 +08:00

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