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fix: coerce array/vector literal elements to element type (issue 0168)

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[N]?T arrays were corrupted: a positional literal .{ null, 7 } stored
bare T/null elements into {T,i1} optional slots because array elements
were never coerced (getStructFields is empty for an array, so the
i<struct_fields.len field-coercion gate never fired). A present element
then read back as absent and direct indexing segfaulted.

lowerStructLiteral's positional branch now computes array_elem_ty for
array/vector targets and coerces each element to it; lowerArrayLiteral
generalizes its slice-only coercion to coerce every element via
coerceToType (layout-aware: scalar->{T,i1}, pointer-sentinel->one-word,
array->slice, concrete->protocol). Verified by 3 adversarial reviews,
suite 780/0.

Regression: examples/optionals/0913-optionals-array-of-optionals.sx.
Filed adjacent pre-existing bugs: 0173 (typed .[null,..] element), 0174
(tuple positional-element coercion), 0175 (positional struct literal
variable element zeroed).
This commit is contained in:
agra
2026-06-22 22:50:20 +03:00
parent 2ea25e84ec
commit 5a436eddb1
9 changed files with 253 additions and 17 deletions
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examples/optionals/expected/0913-optionals-array-of-optionals.exit Normal file
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0

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examples/optionals/expected/0913-optionals-array-of-optionals.stderr Normal file
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examples/optionals/expected/0913-optionals-array-of-optionals.stdout Normal file
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idx ?? : 7
e present
a0 absent
w0: 99
w1: -1
pt0 absent
pt1: 5 6