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    Type:Bug 
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    Resolution: Done
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    Priority:Major - P3 
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    None
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    Affects Version/s: None
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    Component/s: None
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        ALL
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2.5 does not allow for queries that have a "top level" field starting with a $ inside of $and, $or, and $nor. This is, however, a valid query in 2.4
In 2.5:
> db.test.find({$nor: [{$c: 1}]})
error: {
        "$err" : "Can't canonicalize query: BadValue unknown top level operator: $c",
        "code" : 17287
}
> db.test.find({$and: [{$c: 1}]})
error: {
        "$err" : "Can't canonicalize query: BadValue unknown top level operator: $c",
        "code" : 17287
}
> db.test.find({$or: [{$c: 1}]})
error: {
        "$err" : "Can't canonicalize query: BadValue unknown top level operator: $c",
        "code" : 17287
}
> db.runCommand({"buildinfo": 1})
{
        "version" : "2.5.5-pre-",
        "gitVersion" : "f65a0b814b8c77e3fbe90bca0c061c9b77f6acdb",
        "OpenSSLVersion" : "",
        "sysInfo" : "Darwin Andrew-Emil-MacBook-Pro.local 12.4.0 Darwin Kernel Version 12.4.0: Wed May  1 17:57:12 PDT 2013; root:xnu-2050.24.15~1/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_49",
        "loaderFlags" : "-fPIC -pthread -Wl,-bind_at_load -mmacosx-version-min=10.6",
        "compilerFlags" : "-Wnon-virtual-dtor -Woverloaded-virtual -fPIC -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -Werror -pipe -O3 -Wno-unused-function -Wno-deprecated-declarations -mmacosx-version-min=10.6",
        "allocator" : "tcmalloc",
        "versionArray" : [
                2,
                5,
                5,
                -100
        ],
        "javascriptEngine" : "V8",
        "bits" : 64,
        "debug" : false,
        "maxBsonObjectSize" : 16777216,
        "ok" : 1
}
But in 2.4.9
> db.test.find({$or: [{$c: 1}]})
> db.test.find({$and: [{$c: 1}]})
> db.test.find({$nor: [{$c: 1}]})
>