{P} Frontend enhance feedback

[FlorianDeconinck]

The frontend of NDSL (gt4py.cartesian for stencils and DaCe parsing for orchestration) can always be enhanced when erroring out for a better user experience. This tasks collects the ongoing less than ideal or outright missing feedback.

---

• Missing externals feedback #50
• Name variable & size in feedback of bad domain #63

[FlorianDeconinck]

Below we list issues encountered and their tickets if those are down

[FlorianDeconinck]

Extra argument on stencils calls can be taken for domain, extent.

E.g.

@gtscript.stencil(backend="dace:cpu")
def absolute_K_index__field__dace(
    in_field: Field[IJK, np.float64],
    index_field: Field[IJK, np.int32],
    out_field: Field[IJK, np.float64],
    index: int,
):
    with computation(PARALLEL), interval(...):
        out_field = in_field.at(K=index_field)

called with

absolute_K_index__field__dace(in_arr, idx_arr, out_arr, index, rel_index)

Will override domain with the value of index (and die)

[FlorianDeconinck]

Un-useful comment when type mismatch on BinOp (see gtc/common.py:292).

Error is "Type mismatch in .." but doesn't give the line or the source

[CharlesKrop]

Using a gt4py function outside of a stencil does not provide useful error, and in some cases does not even error (i.e. round returns None and execution continues). Need more descriptive error handling explaining that these functions cannot be used in normal python.