Including:
Preliminary work on internationalizing error messages
Preliminary work on exposing runtime errors as catchable exceptions
ECMA-proposed throw and try/catch/finally, with multiple catch clauses
and catchguards
ECMA-proposed in/instanceof operators
IEEE-conformant number to string conversion
Fixes and other good stuff.
Fix 123724 hippo: problems declaring var in an eval statement
This ended up being more complex than I initially thought it would be.
See comments in jsparse.c.