Consider the following test code (parsing in tolerant mode):

require('./esprima').parse('x /* foobar', { tolerant: true })

The current master branch will thrown an exception due to the error Line 1: Unexpected token ILLEGAL.

If this feature is implemented, it will return an AST because the unclosed block comment is tolerated. The error will be still listed in the errors array.

(Migrated from https://code.google.com/p/esprima/issues/detail?id=582, as reported by @mrennie)