Function applicable

src/compute-engine/function-utils.ts:663–670

(
  fn: Expression
)

    for (const name of functionLiteralParameterNames(param)) {
      if (block.localScope!.bindings.has(name)) continue;
      // A destructuring pattern's leaves carry no annotation of their own, so
      // they always take the bare-parameter branch below.
      const t = isDestructuringParameter(param)
        ? undefined
        : functionLiteralParameterType(param);
      if (t !== undefined)
        ce.declare(name, { inferred: false, type: t }, block.localScope);
      else {
        // A bare parameter whose first reference sat in a NESTED Block scope
        // (an `if` branch, a loop body) auto-declared its shared binding there,
        // not here. Adopt that binding as the parameter's: it is the one every