Multi-line mode in the shell went away

MongoDB shell version: 2.1.2-pre-
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> var v = {}
> var w = {
Fri May 04 11:30:58 SyntaxError: invalid property id (shell):1
> // we should be in multi-line mode now

See https://jira.mongodb.org/browse/SERVER-5399?focusedCommentId=116354&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-116354 for the breaking change.