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+## Add a linefeed between end token and terminating ')'.
+
+### Problematic code:
+
+```sh
+var=$(fmt -s "$COLUMNS" << "eof"
+This is a bunch of text
+eof)
+
+```
+
+### Correct code:
+
+```sh
+var=$(fmt -s "$COLUMNS" << "eof"
+This is a bunch of text
+eof
+)
+```
+### Rationale:
+
+When embedding a here document in `$(..)` or `(..)`, there needs to be a linefeed (newline) between the here doc token and the closing `)`. Please insert one.
+
+Failing to do so may cause warnings like this:
+
+    bash: warning: here-document at line 15 delimited by end-of-file (wanted `eof')`
+    dash: 5: Syntax error: end of file unexpected (expecting ")")
+
+### Exceptions:
+
+This error may be incorrectly emitted for `ksh`, where this is allowed. In this case, please either write it in a standard way or ignore this warning.
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