Compiler panic in codegen: `Type is not an array` when encoding `tx.accounts` with `abi.encodePacked`

[jubnzv]

The compiler panics with internal error: entered unreachable code: Type is not an array in src/sema/types.rs:1397 (Type::elem_ty) when tx.accounts (a Solana-specific builtin returning AccountInfo[]) is passed to abi.encodePacked.

MRE:

contract C {
    function f() public {
        abi.encodePacked(tx.accounts);
    }
}

Reproduce: save as mre.sol, run solang compile --target solana mre.sol.

Output:

thread 'main' panicked at src/sema/types.rs:1397:18:
internal error: entered unreachable code: Type is not an array
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Expected behavior: sema rejects encoding tx.accounts (or the encoder handles the AccountInfo struct's non-array fields correctly) instead of panicking.

Solana-only (the tx.accounts builtin does not exist on other targets).

Git commit: 901bfb9
Build: release
rustc 1.96.0-nightly (562dee482 2026-03-21)

[Mandalorian7773]

Hi @salaheldinsoliman @jubnzv , I’d like to work on this issue. can you please assign it to me ?