8c47268539
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.
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2 lines
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