ctest: Add generation, compilation, and running of tests for constants.

Author: mbyx

ctest-next/src/rustc_queries.rs

@@ -44,6 +44,7 @@ pub fn rustc_version() -> Result<RustcVersion> {
 
     // eg: rustc 1.87.0 (17067e9ac 2025-05-09)
     // Assume the format does not change.
+    println!("{}", std::str::from_utf8(&output.stdout)?);
     let [major, minor, patch] = std::str::from_utf8(&output.stdout)?
         .split_whitespace()
         .nth(1)