Spawning a function from inside a module hits "unhandled indirect-spawn"

[jyasskin]

fn main() {
  spawn m.child(10);
}
mod m {
  fn child(int i) {
    log i;
  }
}

Rustboot seems to think that any dotted name is a slot, while this one's an item. It works to import the nested name and spawn it directly.

[graydon]

Distill semantics of use-def maps to fewer and more-obvious words.

• Remove redundant uses of 'resolve' and 'referent' in semant.
• Use defn, defn_id, lval, lval_base more consistently.
• Make associated query functions more consistent.
• Closed by 4d31cf1.