[cfe-dev] RFC: Editor Placeholder Support

[Alex L via cfe-dev]

Hi,

I would like to add support for editor placeholder to Clang's lexer. The
placeholder tokens will function similarly to the placeholders in the Swift
compiler:

- An editor placeholder token starts with '<#' and ends with '#>'.
- When lexing the source that contains placeholders:
  - Clang will report an error when it finds the placeholder token.
  - Then the lexer will treat the placeholders as if they were expanded,
e.g. given:

  void Class::method(<#int x#>)

The parser will see the tokens that correspond to the following source:

  void Class::method(int x)

Do you have any feedback/requests? Should placeholders be recognized at all
times or just when Clang is used by the editor?

Cheers,
Alex
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