list vs. atom

aminagho <[email protected]> Sun, 8 Apr 2007 07:14:02 -0700 (PDT)
Newsgroups gmane.comp.lang.haskell.hugs.user
Message-ID <[email protected]>
what is the best way to distinguish atoms and lists in haskell?
I mean How I can find out the variable is List or atom.
I know we can use :t to define type but  I cannot use this.
I have to do it dynamically in my program.
Thanks a lot for your attention.
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