basic9.js failing in slowWeekly/shardingpassthrough on Linux 64

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         Test : jstests/basic9.js ...

assert failed : key names aren't allowed to start with $ doesn't work

 m30001| 2013-11-14T11:06:05.757+0000 [conn176] creating index with info @ 3:25cd5e8

 m30001| 2013-11-14T11:06:05.757+0000 [conn176] build index on: test.foo_basic9 properties: { v: 1, key: { _id: 1 }, name: "_id_", ns: "test.foo_basic9" }

 m30001| 2013-11-14T11:06:05.758+0000 [conn176] build index done.  scanned 0 total records. 0 secs

Error: Printing Stack Trace

    at printStackTrace (src/mongo/shell/utils.js:38:15)

    at doassert (src/mongo/shell/assert.js:6:5)

    at assert (src/mongo/shell/assert.js:14:5)

    at jstests/basic9.js:15:1

    at /srv/10gen/mci-exec/mci/git@github.commongodb/mongo.git/master/jstests/slowNightly/sharding_passthrough.js:149:13

    at Function.Date.timeFunc (src/mongo/shell/types.js:27:17)

    at /srv/10gen/mci-exec/mci/git@github.commongodb/mongo.git/master/jstests/slowNightly/sharding_passthrough.js:148:14

    at Array.forEach (native)

    at /srv/10gen/mci-exec/mci/git@github.commongodb/mongo.git/master/jstests/slowNightly/sharding_passthrough.js:9:7

2013-11-14T11:06:05.758+0000 assert failed : key names aren't allowed to start with $ doesn't work at src/mongo/shell/assert.js:7

2013-11-14T11:06:05.758+0000 Error: error loading js file: jstests/basic9.js at /srv/10gen/mci-exec/mci/git@github.commongodb/mongo.git/master/jstests/slowNightly/sharding_passthrough.js:149

failed to load: /srv/10gen/mci-exec/mci/git@github.commongodb/mongo.git/master/jstests/slowNightly/sharding_passthrough.js