When the C99 extensions setting is on, the compiler recognizes C++-style two-character combinations that represent single-character punctuation. C++-Style Digraphs lists these digraphs.
| This digraph | is equivalent to this character |
|---|---|
| <: | [ |
| :> | ] |
| <% | { |
| %> | } |
| %: | # |
| %:%: | ## |