process.env.toString() fails

[bzoz]

• Version: current master
• Platform: Ubuntu 64-bit

node -e 'process.env.toString()' gives error:

[eval]:1
process.env.toString()
            ^

TypeError: Cannot convert a Symbol value to a string
    at Object.toString (<anonymous>)
    at [eval]:1:13
    at ContextifyScript.Script.runInThisContext (vm.js:26:33)
    at Object.exports.runInThisContext (vm.js:79:17)
    at Object.<anonymous> ([eval]-wrapper:6:22)
    at Module._compile (module.js:573:32)
    at Immediate.<anonymous> (bootstrap_node.js:383:29)
    at runCallback (timers.js:637:20)
    at tryOnImmediate (timers.js:610:5)
    at processImmediate [as _immediateCallback] (timers.js:582:5)

This works as expected with v7.1.0.

[cjihrig]

See #9631