These tests are derived from the following files within the Google V8 project:
test/mjsunit/harmony/block-conflicts.js
test/mjsunit/harmony/block-for.js
test/mjsunit/harmony/block-leave.js
test/mjsunit/harmony/block-let-declaration.js
test/mjsunit/harmony/block-let-semantics.js
test/mjsunit/harmony/block-scoping.js
Rick Waldron