Update charted to 0.4.8 and roll

packages/petitparser/lib/src/petitparser/parsers.dart

Index: packages/petitparser/lib/src/petitparser/parsers.dart
diff --git a/packages/petitparser/lib/src/petitparser/parsers.dart b/packages/petitparser/lib/src/petitparser/parsers.dart
deleted file mode 100644
index 8cc02d13be2342a6962affeac5dbf5e8eaba0e13..0000000000000000000000000000000000000000
--- a/packages/petitparser/lib/src/petitparser/parsers.dart
+++ /dev/null
@@ -1,81 +0,0 @@
-part of petitparser;
-
-/// Returns a parser that consumes nothing and succeeds.
-///
-/// For example, `char('a').or(epsilon())` is equivalent to
-/// `char('a').optional()`.
-Parser epsilon([result]) => new EpsilonParser(result);
-
-/// A parser that consumes nothing and succeeds.
-class EpsilonParser extends Parser {
-  final _result;
-
-  EpsilonParser(this._result);
-
-  @override
-  Result parseOn(Context context) => context.success(_result);
-
-  @override
-  Parser copy() => new EpsilonParser(_result);
-
-  @override
-  bool hasEqualProperties(Parser other) {
-    return other is EpsilonParser
-        && super.hasEqualProperties(other)
-        && _result == other._result;
-  }
-}
-
-/// Returns a parser that consumes nothing and fails.
-///
-/// For example, `failure()` always fails, no matter what input it is given.
-Parser failure([String message = 'unable to parse']) {
-  return new FailureParser(message);
-}
-
-/// A parser that consumes nothing and fails.
-class FailureParser extends Parser {
-  final String _message;
-
-  FailureParser(this._message);
-
-  @override
-  Result parseOn(Context context) => context.failure(_message);
-
-  @override
-  String toString() => '${super.toString()}[$_message]';
-
-  @override
-  Parser copy() => new FailureParser(_message);
-
-  @override
-  bool hasEqualProperties(Parser other) {
-    return other is FailureParser
-        && super.hasEqualProperties(other)
-        && _message == other._message;
-  }
-}
-
-/// Returns a parser that is not defined, but that can be set at a later
-/// point in time.
-///
-/// For example, the following code sets up a parser that points to itself
-/// and that accepts a sequence of a's ended with the letter b.
-///
-///     var p = undefined();
-///     p.set(char('a').seq(p).or(char('b')));
-SettableParser undefined([String message = 'undefined parser']) {
-  return failure(message).settable();
-}
-
-/// A parser that is not defined, but that can be set at a later
-/// point in time.
-class SettableParser extends DelegateParser {
-  SettableParser(parser) : super(parser);
-
-  /// Sets the receiver to delegate to [parser].
-  void set(Parser parser) => replace(children[0], parser);
-
-  @override
-  Parser copy() => new SettableParser(_delegate);
-}