"Evaluate the sexp under the mouse. Usually, this is the last sexp before
the click, but if you click on a left paren, then it is the sexp beginning
with the paren that is evaluated. Also, since strings evaluate to themselves,
"Evaluate the sexp under the mouse. Usually, this is the last sexp before
the click, but if you click on a left paren, then it is the sexp beginning
with the paren that is evaluated. Also, since strings evaluate to themselves,