Nicholas Nethercote 33603a6d80 Add ErrorGuaranteed to ast::LitKind::Err, token::LitKind::Err.
This mostly works well, and eliminates a couple of delayed bugs.

One annoying thing is that we should really also add an
`ErrorGuaranteed` to `proc_macro::bridge::LitKind::Err`. But that's
difficult because `proc_macro` doesn't have access to `ErrorGuaranteed`,
so we have to fake it.
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