File: is_hidden.doc

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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 `0`;;
false : bool

#hide_constant `0`;;
() : void

#is_hidden `0`;;
true : bool

#unhide_constant `0`;;
() : void

#is_hidden `0`;;
false : bool
}
\SEEALSO
hide_constant, unhide_constant

\ENDDOC