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\DOC is_hidden
\TYPE {is_hidden : string -> bool}
\SYNOPSIS
Determines whether a constant is hidden.
\DESCRIBE
This predicate returns {true} if the named {ML} constant has been hidden by
the function {hide_constant}; it returns {false} if the constant is not hidden.
Hiding a constant forces the quotation parser to treat the constant as
a variable (lexical rules permitting).
\EXAMPLE
{
# is_hidden "SUC";;
val it : bool = false
# hide_constant "SUC";;
val it : unit = ()
# is_hidden "SUC";;
val it : bool = true
}
\SEEALSO
hide_constant, unhide_constant
\ENDDOC
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