Bug Report: Progenitor panic during OpenAPI schema processing

Summary

Two distinct errors occur when using cargo-progenitor to generate Rust code from an OpenAPI schema:

1. Internal Error: Unreachable code panic in typify_impl crate
2. Enum Naming Conflict: Failure to generate unique enum variant names

Environment

• OS: macOS 15.3 (24D5034f)
• Rust Toolchain: rustc 1.87.0-nightly (be73c1f46 2025-03-21)
• Cargo: 1.87.0-nightly (6cf826701 2025-03-14)
• cargo-progenitor: Multiple versions tested(latest crates.io and github main)

Error 1: Internal Error (crates.io version)

Command

cargo progenitor -i openapi.json -o flashnet-api -n flashnet-api -v 0.1.0

Error Message

thread 'main' panicked at /path/to/typify-impl-0.3.0/src/value.rs:168:31:
internal error: entered unreachable code

Stack Trace

stack backtrace:
   0:        0x1045c455c - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::he81ee2f6917ac346
   1:        0x1045e1210 - core::fmt::write::hb8bd6ebe8d126f01
   2:        0x1045c1c7c - std::io::Write::write_fmt::h231b749ddbdedad8
   3:        0x1045c4410 - std::sys::backtrace::BacktraceLock::print::haa0f7dcd7d675535
   4:        0x1045c52b0 - std::panicking::default_hook::{{closure}}::h348ab2736102eb75
   5:        0x1045c5100 - std::panicking::default_hook::h511f34b773963527
   6:        0x1045c5d90 - std::panicking::rust_panic_with_hook::h9212a4961c7816e2
   7:        0x1045c5994 - std::panicking::begin_panic_handler::{{closure}}::h36c66d732862ba4e
   8:        0x1045c4a0c - std::sys::backtrace::__rust_end_short_backtrace::h1a358ecd2efce9b5
   9:        0x1045c5664 - __rustc[a9f817043035500e]::rust_begin_unwind
  10:        0x1045fec28 - core::panicking::panic_fmt::h93d6168e6a972526
  11:        0x1045fec98 - core::panicking::panic::h9bc603bd595e5787
  12:        0x1043a515c - typify_impl::value::<impl typify_impl::type_entry::TypeEntry>::output_value::h371d1f35c6ab1e18
  13:        0x1043a4a2c - typify_impl::value::<impl typify_impl::type_entry::TypeEntry>::output_value::h371d1f35c6ab1e18
  14:        0x1043914f4 - typify_impl::defaults::<impl typify_impl::type_entry::TypeEntry>::default_fn::h636e061fb15039d5
  15:        0x104422ad4 - typify_impl::structs::generate_serde_attr::ha08443aa691a3d0c
  16:        0x104399254 - typify_impl::type_entry::TypeEntry::output_struct::hd9c1bedafb1bc337
  17:        0x104393aac - typify_impl::type_entry::TypeEntry::output::h3aa954e680862016
  18:        0x1043c1cf0 - typify_impl::TypeSpace::to_stream::h5159ab332df57e0c
  19:        0x1042661bc - progenitor_impl::Generator::generate_tokens::h74316bf692ea8887
  20:        0x1041ad3a4 - cargo_progenitor::main::h01165f9824f04b28
  21:        0x1041f2704 - std::sys::backtrace::__rust_begin_short_backtrace::h229088e7ef092790
  22:        0x1041d5870 - std::rt::lang_start::{{closure}}::h34f76fd4b2aa70a5
  23:        0x1045bb998 - std::rt::lang_start_internal::h812ab8fe58e67928
  24:        0x1041b2734 - _main

Error 2: Enum Naming Conflict (from github main)

Command

RUST_BACKTRACE=1 cargo progenitor -i openapi.json -o flashnet-api -n flashnet-api -v 0.1.0

Error Message

thread 'main' panicked at /Users/.cargo/git/checkouts/typify-854920f7bf9e46dd/4bffebf/typify-impl/src/type_entry.rs:281:13:
Failed to make unique variant names for [1m,1M]

Stack Trace

stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: typify_impl::type_entry::TypeEntryEnum::from_metadata
   3: typify_impl::convert::<impl typify_impl::TypeSpace>::convert_enum_string
   4: typify_impl::convert::<impl typify_impl::TypeSpace>::convert_schema_object
   5: typify_impl::convert::<impl typify_impl::TypeSpace>::convert_schema
   6: typify_impl::TypeSpace::convert_ref_type
   7: typify_impl::TypeSpace::add_ref_types
   8: progenitor_impl::Generator::generate_tokens
   9: cargo_progenitor::main

Affected Components

1. typify_impl
2. cargo-progenitor CLI tool
3. OpenAPI schema processing

prettyprint.json

openapi.json

Reproduce the cargo progenitor command with the attached openapi.json, then inspect typify-impl/src/value.rs around line 168 and typify-impl/src/type_entry.rs around line 281. Trace both panic paths through cargo-progenitor and progenitor_impl. Done means the schema processes without either panic and enum variants are generated uniquely.