[fine] Type testing with probes and reporting

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

fine/src/tokens.rs

@@ -429,7 +429,11 @@ impl<'a> Tokens<'a> {
         };
 
         match c {
-            ' ' | '\t' | '\r' | '\n' => self.whitespace(pos),
+            ' ' | '\t' | '\r' => self.whitespace(pos),
+            '\n' => {
+                self.lines.add_line(pos);
+                self.whitespace(pos)
+            }
             '{' => self.token(pos, TokenKind::LeftBrace),
             '}' => self.token(pos, TokenKind::RightBrace),
             '[' => self.token(pos, TokenKind::LeftBracket),