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

Author: mbyx

ctest-next/src/rustc_queries.rs

@@ -85,7 +85,7 @@ pub fn rustc_host() -> Result<String> {
         .nth(4)
         .unwrap()
         .split(':')
-        .last()
+        .next_back()
         .map(|s| s.trim())
         .unwrap();
 

ctest-next/src/translator.rs

@@ -177,6 +177,7 @@ impl Translator {
     /// This method is only used for translating expressions inside of
     /// array brackets, and will fail for expressions not allowed inside of
     /// those brackets.
+    #[expect(clippy::only_used_in_recursion)]
     fn translate_expr(&self, expr: &syn::Expr) -> String {
         match expr {
             syn::Expr::Lit(l) => match &l.lit {