Debugger hover doesn't work with spread operator

[roblourens]

@roblourens since you're assigned. I'm unsure if this is doable:

In Dart we have a spread operator that lays out the iterable content inside a new list or set. In the following code ... is added for the expression evaluation and it fails.

var list = [1, 2, 3]; // Hover `list`

void main() {
  var other = [ // Breakpoint here
    ...list, // Hover `list`
    ...list.another, // Hover `another`
    ... list, // Hover `list` (notice the whitespace before the variable)
    ... list.another, // Hover `another` (notice the whitespace before the variable)
  ];
}

extension _<T> on List<T> {
  List<T> get another => [];
}

We also have !. as a null-assertion operator - contrary to ?. (which I believe TypeScript also shares this syntax). In the ! case, the expression ends at the . after it and doesn't get the null-asserted variable. Say for variable!.value the expression is sent as .value.

Not sure how does VS Code handles extending the expression but I think maybe these cases could also be addressed? Or maybe give the languages a way of handling that?

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Edit

Somewhat related to #238279

Originally posted by @FMorschel in #235168