ghost seq not implemented

[nishanthkarthik]

I am using Prusti version: 0.2.2, commit 528f4c2 2024-03-06 10:13:12 UTC, built on 2024-03-06 10:25:48 UTC

use prusti_contracts::*;

struct Token<T> {
    _p: std::marker::PhantomData<T>
}

#[model]
struct Token<#[generic] T: Copy> {
    ptrs: Seq<*mut T>,
}

This panics with a not-implemented. I followed the example from the examples in prusti-tests using a model with a built-in seq.

backtrace

``` thread 'rustc' panicked at prusti-viper/src/encoder/high/lower/predicates.rs:36:55: not implemented stack backtrace: 0: 0x717ce1562efc - std::backtrace_rs::backtrace::libunwind::trace::h652247f520429b18 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5 1: 0x717ce1562efc - std::backtrace_rs::backtrace::trace_unsynchronized::h20ba733a518048ae at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x717ce1562efc - std::sys_common::backtrace::_print_fmt::ha9cb2d71bba5eb16 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/std/src/sys_common/backtrace.rs:67:5 3: 0x717ce1562efc - ::fmt::h527f3c0db321cf86 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/std/src/sys_common/backtrace.rs:44:22 4: 0x717ce15c915c - core::fmt::rt::Argument::fmt::hc5a8cd063e05c609 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/core/src/fmt/rt.rs:138:9 5: 0x717ce15c915c - core::fmt::write::h818c732e4e373aa5 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/core/src/fmt/mod.rs:1094:21 6: 0x717ce1555b1e - std::io::Write::write_fmt::h9fe6c7e095e96a32 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/std/src/io/mod.rs:1714:15 7: 0x717ce1562ce4 - std::sys_common::backtrace::_print::h4b50c3b478ae2a37 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/std/src/sys_common/backtrace.rs:47:5 8: 0x717ce1562ce4 - std::sys_common::backtrace::print::hf2c7643f5414af94 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/std/src/sys_common/backtrace.rs:34:9 9: 0x717ce1565dda - std::panicking::panic_hook_with_disk_dump::{{closure}}::h62ff4ef3ec32306d at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/std/src/panicking.rs:280:22 10: 0x717ce1565a98 - std::panicking::panic_hook_with_disk_dump::hcd58ca7cb67f8702 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/std/src/panicking.rs:307:9 11: 0x717ce47690b9 - >::call_once::{shim:vtable#0} 12: 0x717ce1566693 - as core::ops::function::Fn>::call::h2b79b1e8b8bd4402 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/alloc/src/boxed.rs:2021:9 13: 0x717ce1566693 - std::panicking::rust_panic_with_hook::ha2c93276d1208654 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/std/src/panicking.rs:757:13 14: 0x717ce15663c6 - std::panicking::begin_panic_handler::{{closure}}::hb78d7a76234f0397 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/std/src/panicking.rs:623:13 15: 0x717ce1563426 - std::sys_common::backtrace::__rust_end_short_backtrace::h96e02fd19b415b36 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/std/src/sys_common/backtrace.rs:170:18 16: 0x717ce1566152 - rust_begin_unwind at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/std/src/panicking.rs:619:5 17: 0x717ce15c5505 - core::panicking::panic_fmt::h62ee289ca1991433 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/core/src/panicking.rs:72:14 18: 0x717ce15c55a3 - core::panicking::panic::ha5a2b79f85789cae at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/core/src/panicking.rs:127:5 19: 0x5d4a801489da - ::ensure_viper_predicate_encoded::h343084aaefbc612d 20: 0x5d4a8014bd34 - ::ensure_type_predicate_encoded::h86f45db38461aab2 21: 0x5d4a80387588 - ::encode_type::h890d1564464375a8 22: 0x5d4a80039b29 - prusti_viper::encoder::mir_encoder::PlaceEncoder::encode_local::h4bf8171dd1a28497 23: 0x5d4a802d8938 - prusti_viper::encoder::mir_encoder::PlaceEncoder::encode_projection::h54ea4a6fe994673b 24: 0x5d4a802d5db1 - prusti_viper::encoder::mir_encoder::PlaceEncoder::encode_place::h971861316b2a6161 25: 0x5d4a80283cec - prusti_viper::encoder::encoder::Encoder::encode_procedure::hee51d6caed060b78 26: 0x5d4a8028c8e4 - prusti_viper::encoder::encoder::Encoder::process_encoding_queue::h8ac45f31b189ebe9 27: 0x5d4a8038c4c6 - prusti_viper::verifier::Verifier::verify::h1d62cd60f58c6fcc 28: 0x5d4a7fde8b25 - ::after_analysis::h7d8f5df69404394f 29: 0x717ce3c789d6 - ::enter::, rustc_span[82af0e0afe7e8690]::ErrorGuaranteed>> 30: 0x717ce3c71c04 - std[843b1ee06368cddb]::sys_common::backtrace::__rust_begin_short_backtrace::, rustc_driver_impl[8b2874cda94e7cd4]::run_compiler::{closure#1}>::{closure#0}, core[b0493a3e457862f3]::result::Result<(), rustc_span[82af0e0afe7e8690]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[b0493a3e457862f3]::result::Result<(), rustc_span[82af0e0afe7e8690]::ErrorGuaranteed>> 31: 0x717ce3c7135e - <::spawn_unchecked_, rustc_driver_impl[8b2874cda94e7cd4]::run_compiler::{closure#1}>::{closure#0}, core[b0493a3e457862f3]::result::Result<(), rustc_span[82af0e0afe7e8690]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[b0493a3e457862f3]::result::Result<(), rustc_span[82af0e0afe7e8690]::ErrorGuaranteed>>::{closure#1} as core[b0493a3e457862f3]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 32: 0x717ce1571075 - as core::ops::function::FnOnce>::call_once::h7bff668e3fcc7cec at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/alloc/src/boxed.rs:2007:9 33: 0x717ce1571075 - as core::ops::function::FnOnce>::call_once::h6cf1c11e2e0c58d1 at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/alloc/src/boxed.rs:2007:9 34: 0x717ce1571075 - std::sys::unix::thread::Thread::new::thread_start::hfa7d5fcc9039f5da at /rustc/ca2b74f1ae5075d62e223c0a91574a1fc3f51c7c/library/std/src/sys/unix/thread.rs:108:17 35: 0x717cdfca955a - 36: 0x717cdfd26a3c - 37: 0x0 - rustc version: 1.74.0-nightly (ca2b74f1a 2023-09-14) platform: x86_64-unknown-linux-gnu query stack during panic: end of query stack ```

[fpoli]

@Aurel300