Exception support in prange body

[ehsantn]

prange doesn't support exceptions in body since the loop can have multiple exits (check done here). However, at least the exception case can be handled I think. Is there a problem with threads raising exceptions?

import numpy as np
from numba import njit, prange

@njit(parallel=True)
def f(X, N):
    acc = 0
    for i in prange(N):
        assert X[i] == 1
        acc += X[i]
    return acc

N = 9
X = np.ones(N)
print(f(X, N))

[sklam]

Yes, parallel ufunc is not propagating an error. There is a stalled patch: #2307

[slayoo]

Would be great if a warning would be issued (during compilation) if parallel=True is used and an exception is being raised from within a parallel block