This behavior is documented in the repl man page, from context it appears to
be to support for custom editors (or the imaginary replproc) to do things w/o
having to grok the MH message filesystem
See comp(1) for a description of the -editor and -noedit switches.
Note that while in the editor, the message being replied to is avail-
able through a link named "@" (assuming the default whatnowproc). In
addition, the actual pathname of the message is stored in the environ-
ment variable $editalt, and the pathname of the folder containing the
message is stored in the environment variable $mhfolder.
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