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(file-symlink-p "foo") ⇒ nil
(file-symlink-p "sym-link") ⇒ "foo"
(file-symlink-p "sym-link2") ⇒ "sym-link"
(file-symlink-p "/bin") ⇒ "/pub/bin"
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(file-directory-p "~rms") ⇒ t
(file-directory-p "~rms/lewis/files.texi") ⇒ nil
(file-directory-p "~rms/lewis/no-such-file") ⇒ nil
(file-directory-p "$HOME") ⇒ nil
(file-directory-p (substitute-in-file-name "$HOME")) ⇒ t
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