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+Each of these needs to be in a separate file,
+because the `delay_span_bug` ICE in rustdoc won't be triggerred
+if even a single other error was emitted.
+
+However, conceptually they are all testing basically the same thing.
+See https://github.com/rust-lang/rust/pull/73566#issuecomment-653689128
+for more details.