some stack miss when error is thrown in eval()

example code:

```
var pe = new (require("pretty-error"));

try {
eval(`(function fn(){
throw new Error('some error');
})()`)
} catch(e) {
console.log(e.stack);
console.log(pe.render(e));
}
```

result:

```
Error: some error
at fn (eval at (S:\_TEST_\index.js:4:2), :2:9)
at eval (eval at (S:\_TEST_\index.js:4:2), :3:4)
at Object. (S:\_TEST_\index.js:4:2)
at Module._compile (module.js:570:32)

Error: some error
- index.js:4 Object.
S:/_TEST_/index.js:4:2

- module.js:570 Module._compile
module.js:570:32
```

Begin with the supplied Node.js eval() example and compare the native e.stack frames with pe.render(e). Trace the stack-rendering entry point in the repository; done means the eval() frames are preserved and rendered rather than omitted, while the existing output remains formatted correctly.

Written by the indexing model from the issue text.