Interface PayloadEffect

argument/emit: 0-based argument position.

argument: the resolved project callable.

argument: what the callee does with its parameter (up to depth).

How the value is read: evt, evt.value, err?.message.

File of the use.

Callable containing the use (Class.method).

What the use does with the value.

1-based line of the use.

write: assigned target; alias: local name; argument/emit: called expression.

Source of the enclosing assignment, call or statement, cut to 120 characters.