tcl-electric-hash-style

tcl-electric-hash-style is a variable defined in `tcl.el'.
Its value is

nil

Documentation:
Style of electric hash insertion to use.
Possible values are `backslash', meaning that `\' quoting should be
done; `quote', meaning that `"' quoting should be done; `smart',
meaning that the choice between `backslash' and `quote' should be
made depending on the number of hashes inserted; or nil, meaning that
no quoting should be done. Any other value for this variable is
taken to mean `smart'. The default is nil.

You can customize this variable.