问numba nopython模式“未定义变量'$313.3'”

EN

Failed at nopython (nopython frontend)
Undefined variable '$313.3'

from numba import jit
from scipy import misc
import numba

f = misc.face()
@jit(nopython=True)
def explorethisx(inar, x):
    places = []
    places.append((x,0))
    x1,y1 = x,0
    s = numba.int64(0)
    co = 0
    #for _ in range( 799):

    while co != numba.int16(799):
        co += 1
        a1,a2,a3 = 999,999,999
        a1 = inar[y1 + 1][x1-1][1]
        a2 = inar[y1 + 1][x1][1]
        a3 = inar[y1 + 1][x1 + 1][1]
        m = a1
        ch = -1
        if m > a2:
            m = a2
            ch = 0
        if m > a3:
            m = a3
            ch = 1
        x1 = x1 + ch
        y1 = y1 + 1
        s += inar[y1][x1][1]
        places.append((x1,y1))
    return([s, places])
explorethisx(f,3)
explorethisx.inspect_types()