Update runtime files.
diff --git a/runtime/syntax/c.vim b/runtime/syntax/c.vim
index 1143ca7..95d3455 100644
--- a/runtime/syntax/c.vim
+++ b/runtime/syntax/c.vim
@@ -1,7 +1,7 @@
" Vim syntax file
" Language: C
" Maintainer: Bram Moolenaar <Bram@vim.org>
-" Last Change: 2017 Apr 30
+" Last Change: 2018 Sep 21
" Quit when a (custom) syntax file was already loaded
if exists("b:current_syntax")
@@ -220,7 +220,7 @@
syn match cCommentSkip contained "^\s*\*\($\|\s\+\)"
syn region cCommentString contained start=+L\=\\\@<!"+ skip=+\\\\\|\\"+ end=+"+ end=+\*/+me=s-1 contains=cSpecial,cCommentSkip
syn region cComment2String contained start=+L\=\\\@<!"+ skip=+\\\\\|\\"+ end=+"+ end="$" contains=cSpecial
- syn region cCommentL start="//" skip="\\$" end="$" keepend contains=@cCommentGroup,cComment2String,cCharacter,cNumbersCom,cSpaceError,@Spell
+ syn region cCommentL start="//" skip="\\$" end="$" keepend contains=@cCommentGroup,cComment2String,cCharacter,cNumbersCom,cSpaceError,cWrongComTail,@Spell
if exists("c_no_comment_fold")
" Use "extend" here to have preprocessor lines not terminate halfway a
" comment.
@@ -239,6 +239,7 @@
" keep a // comment separately, it terminates a preproc. conditional
syn match cCommentError display "\*/"
syn match cCommentStartError display "/\*"me=e-1 contained
+syn match cWrongComTail display "\*/"
syn keyword cOperator sizeof
if exists("c_gnu")
@@ -453,6 +454,7 @@
hi def link cCommentError cError
hi def link cCommentStartError cError
hi def link cSpaceError cError
+hi def link cWrongComTail cError
hi def link cSpecialError cError
hi def link cCurlyError cError
hi def link cOperator Operator