Adjust pp interface to that printing a crate (an reproducing literals/comments) takes a reader, not just a filename. Fixes first big pp-fuzzer bug.

src/comp/driver/rustc.rs

@@ -217,8 +217,9 @@ fn pretty_print_input(session::session sess, ast::crate_cfg cfg,
             ann = pprust::no_ann();
         }
     }
-    pprust::print_crate(sess.get_codemap(), crate, input, ioivec::stdout(),
-                        ann);
+    pprust::print_crate(sess.get_codemap(), crate, input,
+                        ioivec::file_reader(input),
+                        ioivec::stdout(), ann);
 }
 
 fn version(str argv0) {

src/comp/syntax/parse/lexer.rs

@@ -736,9 +736,9 @@ fn is_lit(&token::token t) -> bool {
 
 type lit = rec(str lit, uint pos);
 
-fn gather_comments_and_literals(&codemap::codemap cm, str path)
+fn gather_comments_and_literals(&codemap::codemap cm, str path,
+                                ioivec::reader srdr)
         -> rec(cmnt[] cmnts, lit[] lits) {
-    auto srdr = ioivec::file_reader(path);
     auto src = str::unsafe_from_bytes_ivec(srdr.read_whole_stream());
     auto itr = @interner::mk[str](str::hash, str::eq);
     auto rdr = new_reader(cm, src, codemap::new_filemap(path, 0u, 0u), itr);

src/comp/syntax/print/pprust.rs

@@ -73,10 +73,14 @@ const uint alt_indent_unit = 2u;
 
 const uint default_columns = 78u;
 
-fn print_crate(&codemap cm, @ast::crate crate, str filename,
+// Requires you to pass an input filename and reader so that
+// it can scan the input text for comments and literals to
+// copy forward.
+fn print_crate(&codemap cm, @ast::crate crate,
+               str filename, ioivec::reader in,
                ioivec::writer out, &pp_ann ann) {
     let pp::breaks[] boxes = ~[];
-    auto r = lexer::gather_comments_and_literals(cm, filename);
+    auto r = lexer::gather_comments_and_literals(cm, filename, in);
     auto s =
         @rec(s=pp::mk_printer(out, default_columns),
              cm=some(cm),