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On my environment, fluent-gem uninstall works properly. Here is the result.
% fluent-gem install fluent-plugin-record-reformer --no-document
Fetching: fluent-plugin-record-reformer-0.8.0.gem (100%)
Successfully installed fluent-plugin-record-reformer-0.8.0
1 gem installed
% ls /Users/repeatedly/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/ | grep record-reformer
fluent-plugin-record-reformer-0.8.0/
% fluent-gem uninstall fluent-plugin-record-reformer
Successfully uninstalled fluent-plugin-record-reformer-0.8.0
% ls /Users/repeatedly/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/ | grep record-reformer
Could you paste your result?
Masahiro