message: Resolve a clippy warning for clippy::single_match
  Summary: This was showing up in the open source builds. I was slightly tempted to ignore the lint (we do for Starlark proper), but in this instance I'm somewhat ambivalent, so might as well fix it.
diff: @@ -94,9 +94,8 @@ pub(crate) enum StarFunSource {
  impl StarModule {
  pub fn resolve(&mut self) {
  for x in &mut self.stmts {
  - match x {
  - StarStmt::Fun(x) => x.resolve(),
  - _ => {}
  + if let StarStmt::Fun(x) = x {
  + x.resolve()
  }
  }
  }
  