=some_ruby_code + ":" -# and =some_ruby_code + "<br/>"
EDIT 1:
I'm not sure exactly what you are looking for. Do you want one of them?
==#{some_ruby_code}: -# and ==#{some_ruby_code}<br/>
or
==
It is not possible to use %br in HAML unless this is the first thing other than a line space, to my knowledge.
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