[C++] delete considered harmful

The unbridled use of the delete statement has as an immediate consequence that it becomes terribly hard to find a meaningful set of coordinates in which to describe the process progress. ... The delete statement as it stands is just too primitive, it is too much an invitation to make a mess of one's program.

Never use delete, use smart pointers, memory pools, stack allocations. Don't break RAII.

(x 5) is a list, treated as data by the special operator let. It is not evaluated as an expression at all.

Here's a question for you: Since they have shared history, how would the "expression" (x 5) inside the let statement be expressed as an M-expression? Hint: It's all about the first term.