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Rename kw::Invalid -> kw::Empty See https://rust-lang.zulipchat.com/#narrow/stream/182449-t-compiler.2Fhelp/topic/Is.20there.20a.20symbol.20for.20the.20empty.20string.3F/near/220054471 for context. r? `@petrochenkov`
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.