preval/tests/cases/function/return_string.md

Wannabe compiler tool for JS

# Preval test case

# return_string.md

> function > return_string
>
> A function that returns a string

## Input

`````js filename=intro
function f() {
  return "foo";
}
$(f());
`````

## Output

`````js filename=intro
function f() {
  return "foo";
}
$(f());
`````