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.el .ie does not work in groff 1.21

From: Jim Avera
Subject: .el .ie does not work in groff 1.21
Date: Wed, 13 Feb 2013 11:04:01 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130106 Thunderbird/17.0.2

groff <<'EOF'
.ie     1 .tm action1
.el .ie 0 .tm action2
.el .ie 0 .tm action3
.el       .tm defaultaction
<standard input>:4: warning: unbalanced .el request
<standard input>:5: warning: unbalanced .el request


These warnings seem wrong.  In

  .ie cond anything

it nowhere says that "anything" may not be another conditional,
so you ought be able to write "case" constructs like the above
without having to enclose all the "else" branches in \{\ ... \}

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