Wasm module importing specifier that can't be resolved is missing referrer in error message

[dsherret]

;; toolkit.wat
(module
  (import "env" "get_time_in_seconds" (func $get_time (result i32)))

  (func (export "getValue") (result i32)
    call $get_time
  )
)

// env.ts
function getTimeInSeconds() {
  return Date.now() / 1000;
}

export { getTimeInSeconds as get_time_in_seconds };

// main.ts
import { getValue } from "./toolkit.wasm";

console.log(getValue());

Actual:

> wat2wasm toolkit.wat
> deno run main.ts
error: Relative import path "env" not prefixed with / or ./ or ../

Expected:

> wat2wasm toolkit.wat
> deno run main.ts
error: Relative import path "env" not prefixed with / or ./ or ../
    at file:///.../toolkit.wasm