vim: add differentiability_witness to SIL syntax

compnerd · compnerd · commit c505d19045f6 · 2020-04-11T10:49:09.000-07:00
Add the keyword from the experimental auto-differentiation functionality.
diff --git a/utils/vim/syntax/sil.vim b/utils/vim/syntax/sil.vim
@@ -31,6 +31,7 @@ syn keyword silConventions
       \ c
       \ method
       \ objc_method
+      \ sil_differentiability_witness
       \ thick
       \ thin
       \ witness_method
