Nicholas Nethercote 3532863a96 Change how Symbol::Debug works.
Currently, `Symbol::Debug` and `Symbol::Display` produce the same
output; neither wraps the symbol in double quotes.

This commit changes `Symbol::Debug` so it wraps the symbol in quotes.
This change brings `Symbol`'s behaviour in line with `String` and
`InternedString`. The change requires a couple of trivial test output
adjustments.
2019-10-18 13:26:03 +11:00
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