Re: Streams, directives, and explicit document end markers

The new 1.2 documentation says that appending YAML streams with a "..." 
line inserted between them should always work to append them.

Unfortunately this is not true if the second document is an implicit one 
(ie it has no "---" line). It appears this is literally what the 
specification says, and also libyaml does complain about the following 
text where two trivial implicit documents are appended with a "...":

   doc1
   ...
   doc2

The following patch (against libyaml-stable branch) fixes it but also 
makes it not require a "---" after a % directive, this may also be a 
desirable fix:

Index: src/parser.c
===================================================================
--- src/parser.c        (revision 369)
+++ src/parser.c        (working copy)
@@ -392,18 +392,17 @@
          token = PEEK_TOKEN(parser);
          if (!token) goto error;
          if (token->type != YAML_DOCUMENT_START_TOKEN) {
-            yaml_parser_set_parser_error(parser,
-                    "did not find expected <document start>", 
token->start_mark);
-            goto error;
+            end_mark = start_mark;
+        } else {
+            end_mark = token->end_mark;
+            SKIP_TOKEN(parser);
          }
          if (!PUSH(parser, parser->states, YAML_PARSE_DOCUMENT_END_STATE))
              goto error;
          parser->state = YAML_PARSE_DOCUMENT_CONTENT_STATE;
-        end_mark = token->end_mark;
          DOCUMENT_START_EVENT_INIT(*event, version_directive,
                  tag_directives.start, tag_directives.end, 0,
                  start_mark, end_mark);
-        SKIP_TOKEN(parser);
          version_directive = NULL;
          tag_directives.start = tag_directives.end = NULL;
          return 1;


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