AjaxLine

Adobe's Jeff Dyer has released a new draft of the ECMAScript 4th Edition normative grammar. Here's the main changes in  this draft:

• Rename ListExpression to CommaExpression;
• Make CommaExpression a binary expression in the AST;
• Change ParenExpression to ParenListExpression in SuperExpression;
• Rename ParenListExpression to ParenExpression;
• Remove Path qualified PropertyNames;
• Mark reserved/deferred features with ‘x’;
• Remove ‘wrap’;
• Remove ‘like’ as a type;
• Add ‘like’ as a binary type operator;
• Remove LetStatement;
• Remove UnitDefinition;
• Fold NullableTypeExpression into TypeExpression;
• Remove OverloadedOperator from QualifiedNameIdentifier;
• Add distinguishing syntax for tuples and array types in ArrayType;
• Add SplatExpression to arguments and array literals;
• Add RestPattern to array patterns;
• Add to ReservedIdentifiers ‘type’;
• Add to ContextuallyReservedIdentifiers ‘external’;
• Removed from ContextuallyReservedIdentifiers ‘decimal’, ‘double’, ‘generic’, ‘int’, ‘Number’, ‘precision’, ‘rounding’, ‘standard’, ‘to’, ‘uint’, ‘unit’;
• Add LikedPattern to Parameter;
• Add ‘like’ predicate to ResultType;
• Remove ParameterKind and use in Parameter

Source: Francid Chenge blog.