Ref error

This is to verify the fix of phab:T126241.

This sentence is followed by an empty named reference.^[1] Links back and forth did not work.

This sentence is followed by another empty named reference, used twice.^[2]^[2] Links did not work either.

This sentence is followed by a correct reference.^[3] Links work.

This sentence is followed by a correct reference, used twice.^[4]^[4] Links work.

References

^ Cite error: The named reference name was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference twice-empty was invoked but never defined (see the help page).
^ This is a correct reference.
^ ^a ^b This is a correct reference, used twice.

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