UserRPL. Detect lines with syntax error

[Vtile]

It usually have to do something about object types (wrong type of data) or the special characters on command names. Atleast the emu48 do parse the programs with STR-> command or similar when it receives userRPL program, [IIRC] the same happens when you use inbuild editor in calculator and place the object to the stack [/IIRC].

There is people here who knows the system better than me.