Fix empty documents tests.

parser/src/parser.rs

@@ -3,6 +3,7 @@ use std::collections::HashMap;
 
 #[derive(Clone, Copy, PartialEq, Debug, Eq)]
 enum State {
+    /// We await the start of the stream.
     StreamStart,
     ImplicitDocumentStart,
     DocumentStart,
@@ -265,6 +266,7 @@ impl<T: Iterator<Item = char>> Parser<T> {
             .expect("fetch_token needs to be preceded by peek_token")
     }
 
+    /// Skip the next token from the scanner.
     fn skip(&mut self) {
         self.token = None;
         //self.peek_token();
@@ -407,7 +409,7 @@ impl<T: Iterator<Item = char>> Parser<T> {
     }
 
     fn state_machine(&mut self) -> ParseResult {
-        // let next_tok = self.peek_token()?;
+        // let next_tok = self.peek_token().cloned()?;
         // println!("cur_state {:?}, next tok: {:?}", self.state, next_tok);
         match self.state {
             State::StreamStart => self.stream_start(),
@@ -458,11 +460,9 @@ impl<T: Iterator<Item = char>> Parser<T> {
     }
 
     fn document_start(&mut self, implicit: bool) -> ParseResult {
-        if !implicit {
         while let TokenType::DocumentEnd = self.peek_token()?.1 {
             self.skip();
         }
-        }
 
         match *self.peek_token()? {
             Token(mark, TokenType::StreamEnd) => {

parser/tests/yaml-test-suite.rs

@@ -297,9 +297,6 @@ fn expected_events(expected_tree: &str) -> Vec<String> {
 
 #[rustfmt::skip]
 static EXPECTED_FAILURES: &[&str] = &[
-    // Document with no nodes and document end
-    "HWV9",
-    "QT73",
     // Unusual characters in anchors/aliases
     "8XYN", // emoji!!
     "W5VH", // :@*!$"<foo>: