Use 0: for named-fields debug of tuples and tuple variants
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We'll use this shortly.
field_name is the real field name and doesn't depend on the attribute. Separating this makes things less confusing.
Change the output when the user requests debug printing of a tuple struct in named fields syntax. Previously we output `_0: ` (for example), which isn't really right: Rust permits `0: `, and the field is actually called `0`. This is a behavioural change, but I don't think Debug output is regarded as semver-relevant, so this shouldn't be a breaking change.
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Change the output when the user requests debug printing of a tuple struct in named fields syntax.
Previously we output
_0:(for example), which isn't really right: Rust permits0:, and the field is actually called0.This is a behavioural change, but I don't think Debug output is regarded as semver-relevant, so this shouldn't be a considered breaking change.