Maybe like C's `include`s? Where (I think) the code is in-lined without modification? The include is immutable (unless there are macros). Append only sounds l

Maybe like C's `include`s? Where (I think) the code is in-lined without modification? The include is immutable (unless there are macros). Append only sounds like the included code should be evaluated after other code in a given file (so main defs would take precedent over included defs? Or main defs would be over-written by included defs... I guess it depends on compiler/evaluator implementation. The more I type here, the more I realize how much I don't know about this stuff...