[fine] Type testing with probes and reporting

I'm proud of the test harness here actually. Also fix a bug in
checking!

fine/build.rs

@@ -15,7 +15,7 @@ fn generate_test_for_file(path: PathBuf) -> String {
     while let Some(line) = lines.next() {
         let line = match line.strip_prefix("//") {
             Some(line) => line,
-            None => break,
+            None => continue,
         };
 
         let line = line.trim();