Add session, span tracking, error reporting, beginning of a function to parse an item to rustc.

src/comp/driver/rustc.rs

@@ -25,9 +25,10 @@ fn main(vec[str] args) {
   log "You want rustboot, the compiler next door.";
 
   auto i = 0;
+  auto sess = session.session();
   for (str filename in args) {
     if (i > 0) {
-        auto p = parser.new_parser(filename);
+        auto p = parser.new_parser(sess, filename);
         log "opened file: " + filename;
         auto tok = p.peek();
         while (true) {

src/comp/driver/session.rs

@@ -0,0 +1,37 @@
+import util.common.span;
+import std._uint;
+
+io obj session() {
+    io fn span_err(span sp, str msg) {
+        let str s =  sp.filename;
+        s += ':' as u8;
+        // We really need #fmt soon!
+        s += _uint.to_str(sp.lo.line, 10u);
+        s += ':' as u8;
+        s += _uint.to_str(sp.lo.col, 10u);
+        s += ':' as u8;
+        s += _uint.to_str(sp.hi.line, 10u);
+        s += ':' as u8;
+        s += _uint.to_str(sp.hi.col, 10u);
+        s += ": error: ";
+        s += msg;
+        log s;
+        fail;
+    }
+
+    io fn err(str msg) {
+        let str s = "error: ";
+        s += msg;
+        log s;
+        fail;
+    }
+}
+
+
+// Local Variables:
+// fill-column: 78;
+// indent-tabs-mode: nil
+// c-basic-offset: 4
+// buffer-file-coding-system: utf-8-unix
+// compile-command: "make -k -C ../.. 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
+// End: