|An item read from the variable named s1||
Reads the contents of the local variable named s1 and pushes it to the stack. Since s1's contents can vary, this allows dynamic reading of variables.
# Store a number in the variable named xyz 123 ->xyz # Build a string by concatenating "xy" and "z". # The result is "xyz". Use that as the name of a var and read its contents. # The result of the read is pushed to the stack and traced. "xy" "z" concat <-! trace