Sketch some not-quite-compiling code into comp/fe/lexer.rs.

src/comp/fe/lexer.rs

@@ -0,0 +1,20 @@
+import std._io.buf_reader;
+
+iter buffers(buf_reader rdr) -> vec[u8] {
+  while (true) {
+    let vec[u8] v = rdr.read();
+    if (std._vec.len[u8](v) == uint(0)) {
+      ret;
+    }
+    put v;
+  }
+}
+
+iter bytes(buf_reader rdr) -> u8 {
+  for each (vec[u8] buf in buffers(rdr)) {
+    for (u8 b in buf) {
+      // FIXME: doesn't compile at the moment.
+      // put b;
+    }
+  }
+}