Could not find target for path

[djc]

Problem

While working in https://github.com/rust-lang/rustup/, looking at /tests/suite/cli_rustup.rs.

Logs

OS: darwin (24.0.0)
VSCode: 1.93.1
Error message

thread 'main' panicked at /Users/djc/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustc_plugin-0.10.0-nightly-2024-05-20/src/cli.rs:163:10:
Could not find target for path: /Users/djc/src/rustup/tests/suite/cli_rustup.rs
stack backtrace:
   0: _rust_begin_unwind
   1: core::panicking::panic_fmt
   2: rustc_plugin::cli::only_run_on_file
   3: rustc_plugin::cli::cli_main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

Full log: https://paste.rs/musfL