Unable to create record array

[TomGoBravo]

Reporting a bug

• I am using the latest released version of Numba (most recent is visible in
  the change log (https://github.com/numba/numba/blob/master/CHANGE_LOG).
• I have included below a minimal working reproducer (if you are unsure how
  to write one see http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports).

I'm trying to use numba to run a function that updates a numpy array of records.

Here's a snippet from a complete running example at https://repl.it/@TomGoBravo/numba-create-record

rec_dtype = np.dtype([('a', 'int32'), ('b', 'float64')])
rec = from_dtype(rec_dtype)

# With njit commented out this code runs without error.
# With njit enabled np.array fails to compile and raises
# Cannot cast int32 to Record(a[type=int32;offset=0],b[type=float64;offset=4];12;False): %".88"
@njit # (rec[:](numba.int32, numba.float64))
def make_record(a_val, b_val):
  return np.array((a_val, b_val), dtype=rec_dtype)

From https://gitter.im/numba/numba?at=5e4517b2cd2d737bb0758426

the lowering fail is because the array ctor code expects each tuple element to correspond to the dtype of the array, so it's trying to shove an int32 into a slot of the dtype type.

[stuartarchibald]

Thanks for the report, I can reproduce. Cause diagnosed on gitter link above.