feat[next]: Elementwise operations on Tuples - #2834
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The GTIR 'concat_where' type synthesizer derives the result dims via
'type_info.promote(tb, fb)', which asserted that the promoted dtypes are
'ScalarType'. A local field carries a 'ListType' dtype at the GTIR
level, so any 'concat_where' with a local-field branch failed with a
bare 'AssertionError' during type inference -- and it did so even though
both branches have the identical dtype, since the assertion is on the
dtype's kind, not on the operands differing.
Let 'promote' handle 'ListType' the same way it handles 'ScalarType':
both promote only between equal types, so the two cases collapse into a
single check. The docstring records that a 'ListType' only ever reaches
'promote' from the ITIR level, because the frontend represents the same
concept as a field with a local dimension in 'dims' and a scalar dtype.
The combination was previously untested ('test_concat_where.py' had no
local-dimension coverage), so the latent assert never fired in CI.
tehrengruber
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