JavaScript object literals syntax error

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The NodeJS REPL evaluates code as an expression, by wrapping the code in parentheses, causing {"hello":1} to be ({"hello":1}) which is parsed successfully as an object literal.

Usually and elsewhere (in Chrome/Firefox’s console), the curly braces are parsed as the delimiters of a block, like:

/*imagine if (true) */ {
    "hello": 1 // <-- What's this syntax? It's meaningless.
}

{hello:1} parses successfully, because hello in this context has the meaning of a label:

/*imagine if (true) */ {
    hello: 1;
} //        ^-- Automatic Semicolon Insertion

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