Like C, PSL does a certain amount of expression evaluation at compile
time, whenever it determines that all of the arguments to an operator are
static and have no side effects.
In particular, string concatenation is done at compile time between string
literals. Backslash interpretation is also done at compile time. You can
say
“Now is the time for all” .“\n” .
“good men to come to.”
and this expression is reduced to one string internally.
PSL is also highly efficient. The language is not immediately interpreted,
but instead is compiled into an internal form, which is then executed by a
high-speed interpreter.