"hg tag" fails with "no username supplied"

[Stephen Rasku]

I have recently upgraded from 1.3.1 to 1.8.4.  When I issue an "hg tag"
command, I get the following error:

abort: no username supplied (see "hg help config")

and it leaves a modified .hgtags file behind.

However, I have configured a user in my .hgrc

[ui]
user         = build

Is there now some requirements on the format of the user?  I didn't notice
anything in the UpgradeNotes.

...Stephen
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