* Use `sdftable -s' to get warnings about the grammar.

* Several bug fixes in the grammar.
* Allow one-line comments (#... and //...) to end in EOF.

src/nix-instantiate/parser.cc

@@ -154,7 +154,7 @@ Expr parseExprFromFile(Path path)
     if (!imploded)
         throw Error(format("cannot implode parse tree"));
 
-    debug(format("imploded parse tree of `%1%': %2%")
+    printMsg(lvlVomit, format("imploded parse tree of `%1%': %2%")
         % path % imploded);
 
     /* Finally, clean it up. */