address review comments

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

@@ -1,42 +1,36 @@
 //! 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};
+use run_make_support::{cargo, 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();
-    });
+    // Use the stage0 beta cargo for the compilation (it shouldn't really matter which cargo we use)
+    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(&[
+            // 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",
+            "target",
+        ])
+        // 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();
 }