Use Thread instead of ThreadGroup sub-classes
Change block declaration instantiation to match spec algorithm more closely
Add comments
Remove unused code
change start script to work with absolute paths on cygwin
Add CompilationException class for error reporting in compiler
Escape surrogate characters in regular expressions
Add test function for compiler
Unlabelled break only allowed for BreakableStatements
Add toArray() implementation for SmallArrayList
Disable invalid assertion (bug 1549)
add assertions
Add support for 2-byte variables
Mask lower 32-bits in ToUint32()
Move helper to super-class
Move BlockDeclarationInstantiation into its own file
Add synthetic expression-as-value nodes
Reduce byte-code size for calls
Add new AST node for spreads in call-expressions
Make a limited set of nodes mutuable