(ps (create a 11 b 22)) => "{ a : 11, b : 22 };", which is illegal at

the top level because JS interprets the curly braces as statement

block delimiters. PS should probably generate "({ a : 11, b : 22 })"

instead.

Similarly, (ps (lambda () 123)) =>

"function () {

    return 123;

};"

is also illegal at the top level and should also be wrapped in parens.

Such forms obviously don't come up much in source files, but they do

in a REPL.  We're making a PS REPL (and source-level debugger) for

Emacs, which is how we ran across them.