Big merge from experimental to bleeding edge.

samples/markdown/block_parser.dart

Index: samples/markdown/block_parser.dart
diff --git a/samples/markdown/block_parser.dart b/samples/markdown/block_parser.dart
index b68ed3d1b00d9ed7d4feeeeb457b3612c8293776..16160cd18e2518f5b827895c12c3811a21bb4d1f 100644
--- a/samples/markdown/block_parser.dart
+++ b/samples/markdown/block_parser.dart
@@ -135,7 +135,7 @@ class BlockSyntax {
   /// Gets whether or not [parser]'s current line should end the previous block.
   static bool isAtBlockEnd(BlockParser parser) {
     if (parser.isDone) return true;
-    return syntaxes.some((s) => s.canParse(parser) && s.canEndBlock);
+    return syntaxes.any((s) => s.canParse(parser) && s.canEndBlock);
   }
 }