This wasn't working correctly:

  cat <<-\EOF
    this is $single
    EOF

Signed-off-by: Felipe Contreras <[email protected]>
---
 runtime/syntax/sh.vim | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/runtime/syntax/sh.vim b/runtime/syntax/sh.vim
index b9c71de4c..a4704d61b 100644
--- a/runtime/syntax/sh.vim
+++ b/runtime/syntax/sh.vim
@@ -396,7 +396,7 @@ ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc12 
start="<<-\s*\\\_$\_s*
 ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc13 
start="<<-\s*\\\_$\_s*\"\z([^"]\+\)\""       matchgroup=shHereDoc13 
end="^\s*\z1\s*$"
 ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc14 start="<<\\\z([^ 
\t|>]\+\)"          matchgroup=shHereDoc14 end="^\z1\s*$"
 ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc15 start="<<-\s*\\\z([^ 
\t|>]\+\)"              matchgroup=shHereDoc15 end="^\s*\z1\s*$"
-ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc16 start="<<-\s*\\\z([^ 
\t|>]\+\)"              matchgroup=shHereDoc15 end="^\s*\z1\s*$"
+ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc16 start="<<-\s*\\\z([^ 
\t|>]\+\)"              matchgroup=shHereDoc16 end="^\s*\z1\s*$"
 
 " Here Strings: {{{1
 " =============
@@ -734,6 +734,7 @@ if !exists("skip_sh_syntax_inits")
  hi def link shHereDoc13               shRedir
  hi def link shHereDoc14               shRedir
  hi def link shHereDoc15               shRedir
+ hi def link shHereDoc16               shRedir
 endif
 
 " Delete shell folding commands {{{1
-- 
2.22.0

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