‘gensym’ returns interned symbols, but the algorithm to determine the new symbol is simplistic and predictable.
Thus, one can arrange to produce a symbol before ‘gensym’ does, leading ‘gensym’ to return a symbol that’s not fresh (in terms of ‘eq?’), as is the case with the second call to ‘gensym’ here: --8<---------------cut here---------------start------------->8--- scheme@(guile-user)> (gensym "x") $1 = x379 scheme@(guile-user)> 'x405 $2 = x405 scheme@(guile-user)> (gensym "x") $3 = x405 --8<---------------cut here---------------end--------------->8--- Should we worry about it? I think it may have hard to anticipate security implications. Ludo’.
