Revert "Remove dependency on package:charcode (dart-lang/source_span#66)" (dart-lang/source_span#70)

This reverts commit 778a4bb3bfbbf48da04741381416d7159955b10b.

Reverting to keep `lib/` directory content the same as the latest
published version.
5 files changed
tree: bdde30cfa1cca02c1469cd2a3d395b0eed2dd010
  1. pkgs/