diff --git a/runtime/syntax/generator/vim.vim.base b/runtime/syntax/generator/vim.vim.base
index 169fe20..4c91df4 100644
--- a/runtime/syntax/generator/vim.vim.base
+++ b/runtime/syntax/generator/vim.vim.base
@@ -3,7 +3,7 @@
 " Maintainer:	   Hirohito Higashi <h.east.727 ATMARK gmail.com>
 "	   Doug Kearns <dougkearns@gmail.com>
 " URL:	   https://github.com/vim-jp/syntax-vim-ex
-" Last Change:	   2024 Aug 21
+" Last Change:	   2024 Aug 23
 " Former Maintainer: Charles E. Campbell
 
 " DO NOT CHANGE DIRECTLY.
@@ -526,9 +526,9 @@
 syn match	vimUnletBang	contained	"!"	skipwhite nextgroup=vimUnletVars
 syn region	vimUnletVars	contained	start="$\I\|\h" skip="\n\s*\\" end="$" end="|" contains=vimVar,vimEnvvar,vimContinue,vimString,vimNumber
 
-VimFoldh syn region vimLetHereDoc	matchgroup=vimLetHereDocStart start='\%(^\z(\s*\)\S.*\)\@<==<<\s*trim\%(\s\+\)\@>\z(\L\S*\)'	matchgroup=vimLetHereDocStop end='^\z1\z2$' extend
+VimFoldh syn region vimLetHereDoc	matchgroup=vimLetHereDocStart start='\%(^\z(\s*\)\S.*\)\@<==<<\s*trim\%(\s\+\)\@>\z(\L\S*\)'	matchgroup=vimLetHereDocStop end='^\z1\=\z2$' extend
 VimFoldh syn region vimLetHereDoc	matchgroup=vimLetHereDocStart start='=<<\%(\s*\)\@>\z(\L\S*\)'			matchgroup=vimLetHereDocStop end='^\z1$' extend
-VimFoldh syn region vimLetHereDoc	matchgroup=vimLetHereDocStart start='\%(^\z(\s*\)\S.*\)\@<==<<\s*\%(trim\s\+eval\|eval\s\+trim\)\%(\s\+\)\@>\z(\L\S*\)'	matchgroup=vimLetHereDocStop end='^\z1\z2$' contains=@vimStringInterpolation extend
+VimFoldh syn region vimLetHereDoc	matchgroup=vimLetHereDocStart start='\%(^\z(\s*\)\S.*\)\@<==<<\s*\%(trim\s\+eval\|eval\s\+trim\)\%(\s\+\)\@>\z(\L\S*\)'	matchgroup=vimLetHereDocStop end='^\z1\=\z2$' contains=@vimStringInterpolation extend
 VimFoldh syn region vimLetHereDoc	matchgroup=vimLetHereDocStart start='=<<\s*eval\%(\s\+\)\@>\z(\L\S*\)'			matchgroup=vimLetHereDocStop end='^\z1$' contains=@vimStringInterpolation extend
 
 Vim9 syn keyword	vim9Const	const	skipwhite nextgroup=vim9Variable,vim9VariableList
diff --git a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_00.dump b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_00.dump
index 2e3d0e6..d7bfb6b 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_00.dump
@@ -13,8 +13,8 @@
 ||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|2| +0#0000000&@67
 ||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |t|r|i|m| +0#0000000&@66
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
 |-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@52
-||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@1|l|i|n|e|1| +0#0000000&@65
-||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@1|l|i|n|e|2| +0#0000000&@65
-||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
 @57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_01.dump b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_01.dump
index 6e38ae7..623dc27 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_01.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_01.dump
@@ -1,9 +1,12 @@
 ||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
-|-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@52
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |t|r|i|m| +0#0000000&@66
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+|-+0#0000e05#a8a8a8255| >l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@52
 ||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@1|l|i|n|e|1| +0#0000000&@65
 ||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@1|l|i|n|e|2| +0#0000000&@65
-||+0#0000e05#a8a8a8255| >E+0#e000e06#ffffff0|N|D| +0#0000000&@69
+||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
 |-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@50
 ||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@3|l|i|n|e|1| +0#0000000&@63
@@ -14,7 +17,4 @@
 | +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |i|n|t|e|r|p|o|l|a|t|i|o|n| +0#0000000&@57
 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
 |-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |e|v|a|l| |E|N|D| +0#0000000&@52
-||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|{+0#e000e06&|1+0#e000002&| +0#0000000&|++0#af5f00255&| +0#0000000&|0+0#e000002&|}+0#e000e06&| +0#0000000&@61
-||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|{+0#e000e06&|1+0#e000002&| +0#0000000&|++0#af5f00255&| +0#0000000&|1+0#e000002&|}+0#e000e06&| +0#0000000&@61
-||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
-@57|1|9|,|1| @9|1|3|%| 
+@57|1|9|,|1| @10|7|%| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_02.dump b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_02.dump
index 3613d10..9135666 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_02.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_02.dump
@@ -1,9 +1,12 @@
-||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
-| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
-|-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |e|v|a|l| |E|N|D| +0#0000000&@50
+|-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |e|v|a|l| |E|N|D| +0#0000000&@52
 ||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|{+0#e000e06&|1+0#e000002&| +0#0000000&|++0#af5f00255&| +0#0000000&|0+0#e000002&|}+0#e000e06&| +0#0000000&@61
 ||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|{+0#e000e06&|1+0#e000002&| +0#0000000&|++0#af5f00255&| +0#0000000&|1+0#e000002&|}+0#e000e06&| +0#0000000&@61
-||+0#0000e05#a8a8a8255| >E+0#e000e06#ffffff0|N|D| +0#0000000&@69
+||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+|-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1>l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |e|v|a|l| |E|N|D| +0#0000000&@50
+||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|{+0#e000e06&|1+0#e000002&| +0#0000000&|++0#af5f00255&| +0#0000000&|0+0#e000002&|}+0#e000e06&| +0#0000000&@61
+||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|{+0#e000e06&|1+0#e000002&| +0#0000000&|++0#af5f00255&| +0#0000000&|1+0#e000002&|}+0#e000e06&| +0#0000000&@61
+||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
 |-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |e|v|a|l| |E|N|D| +0#0000000&@47
 ||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@1|l|i|n|e|{+0#e000e06&|1+0#e000002&| +0#0000000&|++0#af5f00255&| +0#0000000&|0+0#e000002&|}+0#e000e06&| +0#0000000&@59
@@ -14,7 +17,4 @@
 ||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@3|l|i|n|e|{+0#e000e06&|1+0#e000002&| +0#0000000&|++0#af5f00255&| +0#0000000&|0+0#e000002&|}+0#e000e06&| +0#0000000&@57
 ||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@3|l|i|n|e|{+0#e000e06&|1+0#e000002&| +0#0000000&|++0#af5f00255&| +0#0000000&|1+0#e000002&|}+0#e000e06&| +0#0000000&@57
 ||+0#0000e05#a8a8a8255| | +0#e000e06#ffffff0@1|E|N|D| +0#0000000&@67
-| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
-| +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |n|o| |i|n|t|e|r|p|o|l|a|t|i|o|n| |(|e|s|c|a|p|e|d| |{| |a|n|d| |}|)| +0#0000000&@36
-| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
-@57|3|7|,|1| @9|3|1|%| 
+@57|3|7|,|3| @9|1|7|%| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_03.dump b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_03.dump
index de3f8fe..4bd2857 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_03.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_03.dump
@@ -1,9 +1,12 @@
+||+0#0000e05#a8a8a8255| | +0#e000e06#ffffff0@1|E|N|D| +0#0000000&@67
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |n|o| |i|n|t|e|r|p|o|l|a|t|i|o|n| |(|e|s|c|a|p|e|d| |{| |a|n|d| |}|)| +0#0000000&@36
 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
 |-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |e|v|a|l| |E|N|D| +0#0000000&@52
-||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|{+0#e000e06&@1|1+0#e000002&| |+| |0|}+0#e000e06&@1| +0#0000000&@59
+||+0#0000e05#a8a8a8255| >l+0#e000002#ffffff0|i|n|e|{+0#e000e06&@1|1+0#e000002&| |+| |0|}+0#e000e06&@1| +0#0000000&@59
 ||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|{+0#e000e06&@1|1+0#e000002&| |+| |1|}+0#e000e06&@1| +0#0000000&@59
 ||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
-| +0#0000e05#a8a8a8255@1> +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
 |-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |e|v|a|l| |E|N|D| +0#0000000&@50
 ||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|{+0#e000e06&@1|1+0#e000002&| |+| |0|}+0#e000e06&@1| +0#0000000&@59
 ||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|{+0#e000e06&@1|1+0#e000002&| |+| |1|}+0#e000e06&@1| +0#0000000&@59
@@ -14,7 +17,4 @@
 ||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@1|l|i|n|e|{+0#e000e06&@1|1+0#e000002&| |+| |1|}+0#e000e06&@1| +0#0000000&@57
 ||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
-|-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |e|v|a|l| |E|N|D| +0#0000000&@45
-||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@3|l|i|n|e|{+0#e000e06&@1|1+0#e000002&| |+| |0|}+0#e000e06&@1| +0#0000000&@55
-||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@3|l|i|n|e|{+0#e000e06&@1|1+0#e000002&| |+| |1|}+0#e000e06&@1| +0#0000000&@55
-@57|5@1|,|0|-|1| @7|5|0|%| 
+@57|5@1|,|1| @9|2|7|%| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_04.dump b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_04.dump
index c6d1b4d..b763e64 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_04.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_04.dump
@@ -1,9 +1,12 @@
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+|-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |e|v|a|l| |E|N|D| +0#0000000&@45
+||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@3|l|i|n|e|{+0#e000e06&@1|1+0#e000002&| |+| |0|}+0#e000e06&@1| +0#0000000&@55
 ||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@3|l|i|n|e|{+0#e000e06&@1|1+0#e000002&| |+| |1|}+0#e000e06&@1| +0#0000000&@55
 ||+0#0000e05#a8a8a8255| | +0#e000e06#ffffff0@1|E|N|D| +0#0000000&@67
-| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1> +0#0000000#ffffff0@72
 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
 | +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |n|o| |i|n|t|e|r|p|o|l|a|t|i|o|n| +0#0000000&@54
-| +0#0000e05#a8a8a8255@1> +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
 |-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |E|N|D| +0#0000000&@57
 ||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|{|1| |+| |0|}| +0#0000000&@61
 ||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|{|1| |+| |1|}| +0#0000000&@61
@@ -14,7 +17,4 @@
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-||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@1|l|i|n|e|{|1| |+| |0|}| +0#0000000&@59
-||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@1|l|i|n|e|{|1| |+| |1|}| +0#0000000&@59
-@57|7|3|,|0|-|1| @7|6|9|%| 
+@57|7|3|,|0|-|1| @7|3|7|%| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_05.dump b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_05.dump
index e66d1cc..e7b8a55 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_05.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_05.dump
@@ -1,9 +1,12 @@
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+|-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@52
+||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@1|l|i|n|e|{|1| |+| |0|}| +0#0000000&@59
 ||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@1|l|i|n|e|{|1| |+| |1|}| +0#0000000&@59
 ||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
-| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1> +0#0000000#ffffff0@72
 |-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@50
 ||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@3|l|i|n|e|{|1| |+| |0|}| +0#0000000&@57
-||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@3>l|i|n|e|{|1| |+| |1|}| +0#0000000&@57
+||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@3|l|i|n|e|{|1| |+| |1|}| +0#0000000&@57
 ||+0#0000e05#a8a8a8255| | +0#e000e06#ffffff0@1|E|N|D| +0#0000000&@67
 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
@@ -14,7 +17,4 @@
 ||+0#0000e05#a8a8a8255| |E+0#e000002#ffffff0|N|D| | +0#0000000&@68
 ||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
-| +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"| |E|N|D| |"|]|)| +0#0000000&@42
-|-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |E|N|D| +0#0000000&@57
-||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0|E|N|D| | +0#0000000&@67
-@57|9|1|,|5| @9|8|7|%| 
+@57|9|1|,|0|-|1| @7|4|8|%| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_06.dump b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_06.dump
index e3c4ca4..6ed3eb5 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_06.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_06.dump
@@ -1,9 +1,12 @@
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"| |E|N|D| |"|]|)| +0#0000000&@42
+|-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |E|N|D| +0#0000000&@57
 ||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0|E|N|D| | +0#0000000&@67
 ||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
-| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1> +0#0000000#ffffff0@72
 | +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"|E|N|D| |"|]|)| +0#0000000&@43
 |-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@52
-||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@1>E|N|D| | +0#0000000&@66
+||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@1|E|N|D| | +0#0000000&@66
 ||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
 | +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"|E|N|D| |"|]|)| +0#0000000&@43
@@ -11,10 +14,7 @@
 ||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@3|E|N|D| | +0#0000000&@64
 ||+0#0000e05#a8a8a8255| | +0#e000e06#ffffff0@1|E|N|D| +0#0000000&@67
 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
-|~+0#4040ff13&| @73
-|~| @73
-|~| @73
-|~| @73
-|~| @73
-|~| @73
-| +0#0000000&@56|1|0|9|,|3| @8|B|o|t| 
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |e|n|d| |m|a|r|k|e|r| |m|u|s|t| |b|e| |v|e|r|t|i|c|a|l@1|y| |a|l|i|g|n|e|d| |w|i|t|h| |:|l|e|t| |(|i|f| |p|r|e|c|e|d|e|d| |b|y| |w|h|i|t|e|s|p
+| +0&#a8a8a8255@1|a+0&#ffffff0|c|e|)| +0#0000000&@68
+@57|1|0|9|,|0|-|1| @6|5|7|%| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_07.dump b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_07.dump
new file mode 100644
index 0000000..85bb2f3
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_07.dump
@@ -0,0 +1,20 @@
+| +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |e|n|d| |m|a|r|k|e|r| |m|u|s|t| |b|e| |v|e|r|t|i|c|a|l@1|y| |a|l|i|g|n|e|d| |w|i|t|h| |:|l|e|t| |(|i|f| |p|r|e|c|e|d|e|d| |b|y| |w|h|i|t|e|s|p
+| +0&#a8a8a8255@1|a+0&#ffffff0|c|e|)| +0#0000000&@68
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"|E|N|D|"|]|)| +0#0000000&@44
+|-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@52
+||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@1>E|N|D| +0#0000000&@67
+||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@1|"+0#0000e05&| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"|E|N|D|"|]|)| +0#0000000&@42
+|-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@50
+||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@3|E|N|D| +0#0000000&@65
+||+0#0000e05#a8a8a8255| | +0#e000e06#ffffff0@1|E|N|D| +0#0000000&@67
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"|E|N|D| |"|]|)| +0#0000000&@43
+|-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@52
+||+0#0000e05#a8a8a8255| |E+0#e000002#ffffff0|N|D| | +0#0000000&@68
+||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@1|"+0#0000e05&| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"|E|N|D|"|]|)| +0#0000000&@42
+@57|1|2|5|,|3| @8|6|7|%| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_08.dump b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_08.dump
new file mode 100644
index 0000000..16149fe
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_08.dump
@@ -0,0 +1,20 @@
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@1|"+0#0000e05&| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"|E|N|D|"|]|)| +0#0000000&@42
+|-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@50
+||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@3|E|N|D| +0#0000000&@65
+||+0#0000e05#a8a8a8255| | +0#e000e06#ffffff0@1|E|N|D| +0#0000000&@67
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@1>"+0#0000e05&| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"|E|N|D| |"|]|)| +0#0000000&@41
+|-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@50
+||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@3|E|N|D| | +0#0000000&@64
+||+0#0000e05#a8a8a8255| | +0#e000e06#ffffff0@1|E|N|D| +0#0000000&@67
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@1|"+0#0000e05&| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"|E|N|D|"|]|)| +0#0000000&@42
+|-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@50
+||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@4|E|N|D| +0#0000000&@64
+||+0#0000e05#a8a8a8255| | +0#e000e06#ffffff0@1|E|N|D| +0#0000000&@67
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@1|"+0#0000e05&| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"|E|N|D| |"|]|)| +0#0000000&@41
+|-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@50
+||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@4|E|N|D| | +0#0000000&@63
+||+0#0000e05#a8a8a8255| | +0#e000e06#ffffff0@1|E|N|D| +0#0000000&@67
+@57|1|4|3|,|3| @8|7@1|%| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_09.dump b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_09.dump
new file mode 100644
index 0000000..fbb7d9d
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_09.dump
@@ -0,0 +1,20 @@
+||+0#0000e05#a8a8a8255| | +0#e000e06#ffffff0@1|E|N|D| +0#0000000&@67
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@1|"+0#0000e05&| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"|E|N|D| |"|]|)| +0#0000000&@41
+|-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@50
+||+0#0000e05#a8a8a8255| |E+0#e000002#ffffff0|N|D| | +0#0000000&@68
+||+0#0000e05#a8a8a8255| >E+0#e000e06#ffffff0|N|D| +0#0000000&@69
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@1|"+0#0000e05&| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"|E|N|D|"|]|)| +0#0000000&@42
+|-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@50
+||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0|E|N|D| +0#0000000&@68
+||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@1|"+0#0000e05&| |a|s@1|e|r|t|_|e|q|u|a|l|(|f|o@1|,| |[|"|E|N|D|"|]|)| +0#0000000&@42
+|-+0#0000e05#a8a8a8255| | +0#0000000#ffffff0@1|l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |t|r|i|m| |E|N|D| +0#0000000&@50
+||+0#0000e05#a8a8a8255| | +0#e000002#ffffff0@2|E|N|D| +0#0000000&@66
+||+0#0000e05#a8a8a8255| |E+0#e000e06#ffffff0|N|D| +0#0000000&@69
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |e|n|d| |m|a|r|k|e|r|s| +0#0000000&@59
+@57|1|6|1|,|1| @8|8|7|%| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_10.dump b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_10.dump
new file mode 100644
index 0000000..93db587
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_10.dump
@@ -0,0 +1,20 @@
+| +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |e|n|d| |m|a|r|k|e|r|s| +0#0000000&@59
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+|-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |!|@|#|$|%|^|&|*|(|)|_|+| +0#0000000&@48
+||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|1| +0#0000000&@67
+||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|2| +0#0000000&@67
+||+0#0000e05#a8a8a8255| >!+0#e000e06#ffffff0|@|#|$|%|^|&|*|(|)|_|+| +0#0000000&@60
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+|-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |0|!|@|#|$|%|^|&|*|(|)|_|+| +0#0000000&@47
+||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|1| +0#0000000&@67
+||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|2| +0#0000000&@67
+||+0#0000e05#a8a8a8255| |0+0#e000e06#ffffff0|!|@|#|$|%|^|&|*|(|)|_|+| +0#0000000&@59
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+|-+0#0000e05#a8a8a8255| |l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#e000e06&|<@1| |A|!|@|#|$|%|^|&|*|(|)|_|+| +0#0000000&@47
+||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|1| +0#0000000&@67
+||+0#0000e05#a8a8a8255| |l+0#e000002#ffffff0|i|n|e|2| +0#0000000&@67
+||+0#0000e05#a8a8a8255| |A+0#e000e06#ffffff0|!|@|#|$|%|^|&|*|(|)|_|+| +0#0000000&@59
+| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@72
+| +0#0000e05#a8a8a8255@1|"+0&#ffffff0| |e|r@1|o|r| |-| |l|e|a|d|i|n|g| |l|o|w|e|r|c|a|s|e| |c|h|a|r|a|c|t|e|r| +0#0000000&@35
+| +0#0000e05#a8a8a8255@1|l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#af5f00255&|<@1| +0#0000000&|a+0#af5f00255&|!|@+0#0000000&|#|$|%+0#af5f00255&|^+0#0000000&|&|*+0#af5f00255&|(+0#e000e06&|)|_+0#0000000&|++0#af5f00255&| +0#0000000&@47
+@57|1|7|9|,|1| @8|9|7|%| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_11.dump b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_11.dump
new file mode 100644
index 0000000..f63b3b6
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_ex_let_heredoc_11.dump
@@ -0,0 +1,20 @@
+| +0#0000e05#a8a8a8255@1|l+0#af5f00255#ffffff0|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|=+0#af5f00255&|<@1| +0#0000000&|a+0#af5f00255&|!|@+0#0000000&|#|$|%+0#af5f00255&|^+0#0000000&|&|*+0#af5f00255&|(+0#e000e06&|)|_+0#0000000&|++0#af5f00255&| +0#0000000&@47
+| +0#0000e05#a8a8a8255@1|l+0#0000000#ffffff0|i|n|e|1| @67
+| +0#0000e05#a8a8a8255@1|l+0#0000000#ffffff0|i|n|e|2| @67
+| +0#0000e05#a8a8a8255@1|a+0#af5f00255#ffffff0|!|@+0#0000000&|#|$|%+0#af5f00255&|^+0#0000000&|&|*+0#af5f00255&|(+0#e000e06&|)|_+0#0000000&|++0#af5f00255&| +0#0000000&@59
+| +0#0000e05#a8a8a8255@1> +0#0000000#ffffff0@72
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+| +0#0000000&@56|1|9|6|,|0|-|1| @6|B|o|t| 
diff --git a/runtime/syntax/testdir/input/vim_ex_let_heredoc.vim b/runtime/syntax/testdir/input/vim_ex_let_heredoc.vim
index da9adff..2f88f93 100644
--- a/runtime/syntax/testdir/input/vim_ex_let_heredoc.vim
+++ b/runtime/syntax/testdir/input/vim_ex_let_heredoc.vim
@@ -13,6 +13,9 @@
 line2
 END
 
+
+" trim
+
 let foo =<< trim END
   line1
   line2
@@ -114,3 +117,80 @@
     END 
   END
 
+
+" end marker must be vertically aligned with :let (if preceded by whitespace)
+
+" assert_equal(foo, ["END"])
+let foo =<< trim END
+  END
+END
+
+  " assert_equal(foo, ["END"])
+  let foo =<< trim END
+    END
+  END
+
+" assert_equal(foo, ["END "])
+let foo =<< trim END
+END 
+END
+
+  " assert_equal(foo, ["END"])
+  let foo =<< trim END
+    END
+  END
+
+  " assert_equal(foo, ["END "])
+  let foo =<< trim END
+    END 
+  END
+
+  " assert_equal(foo, ["END"])
+  let foo =<< trim END
+     END
+  END
+
+  " assert_equal(foo, ["END "])
+  let foo =<< trim END
+     END 
+  END
+
+  " assert_equal(foo, ["END "])
+  let foo =<< trim END
+END 
+END
+
+  " assert_equal(foo, ["END"])
+  let foo =<< trim END
+ END
+END
+
+  " assert_equal(foo, ["END"])
+  let foo =<< trim END
+   END
+END
+
+
+" end markers
+
+let foo =<< !@#$%^&*()_+
+line1
+line2
+!@#$%^&*()_+
+
+let foo =<< 0!@#$%^&*()_+
+line1
+line2
+0!@#$%^&*()_+
+
+let foo =<< A!@#$%^&*()_+
+line1
+line2
+A!@#$%^&*()_+
+
+" error - leading lowercase character
+let foo =<< a!@#$%^&*()_+
+line1
+line2
+a!@#$%^&*()_+
+
diff --git a/runtime/syntax/vim.vim b/runtime/syntax/vim.vim
index 1ae39cf..323aa7c 100644
--- a/runtime/syntax/vim.vim
+++ b/runtime/syntax/vim.vim
@@ -3,7 +3,7 @@
 " Maintainer:	   Hirohito Higashi <h.east.727 ATMARK gmail.com>
 "	   Doug Kearns <dougkearns@gmail.com>
 " URL:	   https://github.com/vim-jp/syntax-vim-ex
-" Last Change:	   2024 Aug 21
+" Last Change:	   2024 Aug 23
 " Former Maintainer: Charles E. Campbell
 
 " DO NOT CHANGE DIRECTLY.
@@ -565,9 +565,9 @@
 syn match	vimUnletBang	contained	"!"	skipwhite nextgroup=vimUnletVars
 syn region	vimUnletVars	contained	start="$\I\|\h" skip="\n\s*\\" end="$" end="|" contains=vimVar,vimEnvvar,vimContinue,vimString,vimNumber
 
-VimFoldh syn region vimLetHereDoc	matchgroup=vimLetHereDocStart start='\%(^\z(\s*\)\S.*\)\@<==<<\s*trim\%(\s\+\)\@>\z(\L\S*\)'	matchgroup=vimLetHereDocStop end='^\z1\z2$' extend
+VimFoldh syn region vimLetHereDoc	matchgroup=vimLetHereDocStart start='\%(^\z(\s*\)\S.*\)\@<==<<\s*trim\%(\s\+\)\@>\z(\L\S*\)'	matchgroup=vimLetHereDocStop end='^\z1\=\z2$' extend
 VimFoldh syn region vimLetHereDoc	matchgroup=vimLetHereDocStart start='=<<\%(\s*\)\@>\z(\L\S*\)'			matchgroup=vimLetHereDocStop end='^\z1$' extend
-VimFoldh syn region vimLetHereDoc	matchgroup=vimLetHereDocStart start='\%(^\z(\s*\)\S.*\)\@<==<<\s*\%(trim\s\+eval\|eval\s\+trim\)\%(\s\+\)\@>\z(\L\S*\)'	matchgroup=vimLetHereDocStop end='^\z1\z2$' contains=@vimStringInterpolation extend
+VimFoldh syn region vimLetHereDoc	matchgroup=vimLetHereDocStart start='\%(^\z(\s*\)\S.*\)\@<==<<\s*\%(trim\s\+eval\|eval\s\+trim\)\%(\s\+\)\@>\z(\L\S*\)'	matchgroup=vimLetHereDocStop end='^\z1\=\z2$' contains=@vimStringInterpolation extend
 VimFoldh syn region vimLetHereDoc	matchgroup=vimLetHereDocStart start='=<<\s*eval\%(\s\+\)\@>\z(\L\S*\)'			matchgroup=vimLetHereDocStop end='^\z1$' contains=@vimStringInterpolation extend
 
 Vim9 syn keyword	vim9Const	const	skipwhite nextgroup=vim9Variable,vim9VariableList