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fix: xx pack[i] to a protocol target heap-copies the element

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Erasing a single comptime-pack element to a protocol value
(`xx sources[0]` with a protocol target) tripped the pack-as-value
error: buildProtocolErasure treated the index_expr as an lvalue and
took its address via lowerExprAsPtr, whose .index_expr arm lowers the
bare pack as a value (a pack is comptime-only with no runtime storage).

isLvalueExpr now reports a comptime pack index as an rvalue, decided
via the same packArgNodeAt predicate the value path uses — so the value
and lvalue paths can't diverge on what counts as a pack element — and
erasure heap-copies the already-materialized element instead.

Resolves issue 0135. Regression tests: examples/0547, 0548.
This commit is contained in:
agra
2026-06-13 18:55:10 +03:00
parent d3f5cb20cb
commit 8c47268539
10 changed files with 252 additions and 2 deletions
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