rust/tests/run-make/rustc-crates-on-stable/rmake.rs

//! Checks if selected rustc crates can be compiled on the stable channel (or a "simulation" of it).
//! These crates are designed to be used by downstream users.

use run_make_support::{cargo, run_in_tmpdir, rustc_path, source_root};

fn main() {
    run_in_tmpdir(|| {
        // Use the stage0 beta cargo for the compilation (it shouldn't really matter which cargo we
        // use)
        let cargo = cargo()
            // Ensure `proc-macro2`'s nightly detection is disabled
            .env("RUSTC_STAGE", "0")
            .env("RUSTC", rustc_path())
            // We want to disallow all nightly features to simulate a stable build
            .env("RUSTFLAGS", "-Zallow-features=")
            .arg("build")
            .arg("--manifest-path")
            .arg(source_root().join("Cargo.toml"))
            .args(&[
                "--config",
                r#"workspace.exclude=["library/core"]"#,
                // Avoid depending on transitive rustc crates
                "--no-default-features",
                // Emit artifacts in this temporary directory, not in the source_root's `target`
                // folder
                "--target-dir",
                ".",
            ])
            // Check that these crates can be compiled on "stable"
            .args(&[
                "-p",
                "rustc_type_ir",
                "-p",
                "rustc_next_trait_solver",
                "-p",
                "rustc_pattern_analysis",
                "-p",
                "rustc_lexer",
            ])
            .run();
    });
}