Cannot use 1d array containing a single value as a predicate.

[vivekvekariya]

Cannot cast array(float64, 1d, C) to bool: %".155" = load {i8*, i8*, i64, i64, double*, [1 x i64], [1 x i64]}, {i8*, i8*, i64, i64, double*, [1 x i64], [1 x i64]}* %"large"

[stuartarchibald]

Thanks for the report. Please could you provide more information about what caused this problem:

1. The code that you were running (as a minimal working reproducer, if you are unsure how to write one see http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports).
2. Any data needed to run the code.
3. The full trace back of the exception.

Thanks.

[bittremieux]

@vivekvekariya Are you using Python 3.8? If so, this might be related to #4712.

[vivekvekariya]

@bittremieux No I am using Python 3.7.4

[stuartarchibald]

Gitter discussion: https://gitter.im/numba/numba?at=5de6abae46397c721c7e5f17

This is a reproducer:

import numpy as np
from numba import njit

def foo():
    x = np.ones(1)
    if x:
        pass

njit(foo)()

it's the bug fixed by this: #3901 (or related to, may need bool(types.Array(<ty>, 1, <order>)) implementing too).

[stuartarchibald]

Fixed by #5225, closing.