diff --git a/runtime/doc/syntax.txt b/runtime/doc/syntax.txt
index 0c15693c5e..dc8b3f99c5 100644
--- a/runtime/doc/syntax.txt
+++ b/runtime/doc/syntax.txt
@@ -370,6 +370,20 @@ ADA
 See |ft-ada-syntax|
 
 
+ALGOL 68					*algol68* *ft-algol68-syntax*
+
+This syntax file currently targets the Algol 68 Genie project using the
+default UPPER stropping regime.  It should also be usuable in other
+environments using the UPPER stropping regime, though somewhat less complete.
+
+Highlighting can be further configured with the following variables.
+
+Variable			Highlight ~
+*algol68_no_preludes*		no prelude identifiers, procedures or
+				bold word operators
+*algol68_symbolic_operators*	all prelude symbolic operators
+
+
 ANT							*ft-ant-syntax*
 
 The ant syntax file provides syntax highlighting for javascript and python
diff --git a/runtime/doc/various.txt b/runtime/doc/various.txt
index 4069513af2..f10014ab2e 100644
--- a/runtime/doc/various.txt
+++ b/runtime/doc/various.txt
@@ -186,6 +186,9 @@ gx			Opens the current filepath, URL (decided by
 			If the mark is "=", a line of dashes is printed
 			around the current line.
 
+			If the 'number' or 'relativenumber' option is set,
+			absolute line numbers will be included in the output.
+
 							*:z!*
 :[range]z![+-^.=][count]
 			Like ":z", but when [count] is not specified, it
diff --git a/runtime/ftplugin/algol68.vim b/runtime/ftplugin/algol68.vim
new file mode 100644
index 0000000000..b995a1fcee
--- /dev/null
+++ b/runtime/ftplugin/algol68.vim
@@ -0,0 +1,47 @@
+" Vim filetype plugin
+" Language:		Algol 68
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Last Change:		2026 Apr 23
+
+if exists("b:did_ftplugin")
+  finish
+endif
+let b:did_ftplugin = 1
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+" TODO: 'comments'
+
+setlocal commentstring=#\ %s\ #
+
+let &l:include='\c\%(^\|;\)\s*\%(PR\|PRAGMAT\)\s\+\%(read\|include\)'
+
+let b:undo_ftplugin = "setl cms< inc<"
+
+if exists("loaded_matchit") && !exists("b:match_words")
+  let b:match_ignorecase = 0
+  let b:match_words = '\<BEGIN\>:\<END\>,' ..
+	\	      '\<IF\>:\<THEN\>:\<ELIF\>:\<ELSE\>:\<FI\>,' ..
+	\	      '\<CASE\>:\<IN\>:\<OUSE\>:\<OUT\>:\<ESAC\>,' ..
+	"\ TODO: loops have overlapping start and intermediate keywords like
+	"\ `TO` which are difficult to match with patterns alone.
+	\	      '\<DO\>:\<OD\>'
+  let b:match_skip = 's:Comment\|String\|PreProc'
+  let b:undo_ftplugin ..= " | unlet! b:match_ignorecase b:match_skip b:match_words"
+endif
+
+if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
+  let b:browsefilter = "Algol 68 Source Files (*.a68)\t*.a68\n"
+  if has("win32")
+    let b:browsefilter ..= "All Files (*.*)\t*\n"
+  else
+    let b:browsefilter ..= "All Files (*)\t*\n"
+  endif
+  let b:undo_ftplugin ..= " | unlet! b:browsefilter"
+endif
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
+" vim: nowrap sw=2 sts=2 ts=8
diff --git a/runtime/ftplugin/help.vim b/runtime/ftplugin/help.vim
index 7f60953738..86315b21ec 100644
--- a/runtime/ftplugin/help.vim
+++ b/runtime/ftplugin/help.vim
@@ -4,6 +4,7 @@
 " Last Change:          2025 Apr 08
 " 2025 Apr 08 by Vim project (set 'omnifunc' and 'iskeyword', #17073)
 " 2025 Aug 08 by Vim project (unset comment options, #17889)
+" 2026 Apr 26 by Vim project (make HelpComplete global, #20024)
 
 if exists("b:did_ftplugin")
   finish
@@ -17,14 +18,14 @@ let b:undo_ftplugin = "setl isk< fo< tw< cole< cocu< keywordprg< omnifunc< comme
 
 setl comments= cms=
 
-setlocal formatoptions+=tcroql textwidth=78 keywordprg=:help! omnifunc=s:HelpComplete
+setlocal formatoptions+=tcroql textwidth=78 keywordprg=:help! omnifunc=HelpComplete
 let &l:iskeyword='!-~,^*,^|,^",192-255'
 if has("conceal")
   setlocal cole=2 cocu=nc
 endif
 
-if !exists('*s:HelpComplete')
-  func s:HelpComplete(findstart, base)
+if !exists('*HelpComplete')
+  func HelpComplete(findstart, base)
     if a:findstart
       let colnr = col('.') - 1 " Get the column number before the cursor
       let line = getline('.')
diff --git a/runtime/lua/vim/filetype.lua b/runtime/lua/vim/filetype.lua
index 01824fe74c..6c70d8929a 100644
--- a/runtime/lua/vim/filetype.lua
+++ b/runtime/lua/vim/filetype.lua
@@ -245,6 +245,7 @@ local extension = {
   adb = 'ada',
   tdf = 'ahdl',
   aidl = 'aidl',
+  a68 = 'algol68',
   aml = 'aml',
   run = 'ampl',
   g4 = 'antlr4',
diff --git a/runtime/syntax/algol68.vim b/runtime/syntax/algol68.vim
new file mode 100644
index 0000000000..129e938074
--- /dev/null
+++ b/runtime/syntax/algol68.vim
@@ -0,0 +1,469 @@
+" Vim syntax file
+" Language:		Algol 68
+" Version:		0.4
+" Maintainer:		Janis Papanagnou
+" Previous Maintainer:	NevilleD.ALGOL_68@sgr-a.net
+" Last Change:		2026 Apr 23
+
+if exists("b:current_syntax")
+  finish
+endif
+
+syn sync minlines=250 maxlines=500
+
+" Algol68 Final Report, unrevised
+syn keyword algol68PreProc	PRIORITY
+syn keyword algol68Operator	BTB CTB CONJ QUOTE CT CTAB EITHER SIGN
+
+
+" Algol68 Revised Report
+syn keyword algol68Boolean	TRUE FALSE
+syn keyword algol68Conditional	IF THEN ELSE ELIF FI
+syn keyword algol68Conditional	CASE IN OUT OUSE ESAC
+syn keyword algol68Constant	NIL SKIP EMPTY
+syn keyword algol68Statement	MODE OP PRIO PROC
+syn keyword algol68Label	GOTO 
+syn match   algol68Label	"\<GO TO\>"
+syn keyword algol68Operator	ABS REPR ROUND ENTIER ARG BIN LENG SHORTEN ODD
+syn keyword algol68Operator	SHL SHR ROL ROR UP DOWN LEVEL LWB UPB I RE IM
+syn keyword algol68Operator	OVER MOD ELEM SET CLEAR
+syn keyword algol68Operator	LT LE GE GT
+syn keyword algol68Operator	EQ NE
+syn keyword algol68Operator	AND OR XOR NOT
+" Genie short-circuit pseudo operators
+syn keyword algol68Operator	THEF ANDF ANDTH ELSF ORF OREL
+syn keyword algol68Operator	ANDTHEN ORELSE
+syn keyword algol68Operator	MINUSAB PLUSAB TIMESAB DIVAB OVERAB MODAB PLUSTO
+syn keyword algol68Operator	IS ISNT OF AT
+syn keyword algol68Operator	SORT ELEMS
+syn keyword algol68Repeat	FOR FROM BY UPTO DOWNTO TO WHILE DO UNTIL OD
+syn keyword algol68Statement	PAR BEGIN END EXIT
+syn keyword algol68Struct	STRUCT
+syn keyword algol68PreProc	VECTOR
+syn keyword algol68Type		FLEX HEAP LOC LONG REF SHORT
+syn keyword algol68Type		VOID BOOL INT REAL COMPL CHAR STRING COMPLEX
+syn keyword algol68Type		BITS BYTES FILE CHANNEL PIPE SEMA SOUND
+syn keyword algol68Type		FORMAT STRUCT UNION 
+" Genie extensions in addition to ROUND and ENTIER
+syn keyword algol68Operator	FLOOR CEIL NINT TRUNC FRAC FIX
+
+    " 20011222az: Added new items.
+syn keyword algol68Todo contained	TODO FIXME XXX DEBUG NOTE
+
+
+" String
+syn region  algol68String	matchgroup=algol68String start=+"+ end=+"+ contains=algol68StringEscape
+syn match   algol68StringEscape	contained '""'
+syn match   algol68StringEscape	contained "\\$"
+
+
+syn match   algol68Identifier		"\<[a-z][a-z0-9_]*\>"
+
+
+if exists("algol68_symbolic_operators")
+  syn match   algol68SymbolOperator	"\\"
+  syn match   algol68SymbolOperator	":=\|="
+  syn match   algol68SymbolOperator	"[~^]"
+  syn match   algol68SymbolOperator	"[~^]="
+  syn match   algol68SymbolOperator	"[<>]"
+  syn match   algol68SymbolOperator	"[<>]="
+  syn match   algol68SymbolOperator	"\%([-+*%/]\|%\*\)"
+  syn match   algol68SymbolOperator	"\%([-+*%/]\|%\*\):="
+  syn match   algol68SymbolOperator	"+=:"
+  syn match   algol68SymbolOperator	"*\*\|&"
+endif
+
+syn match  algol68Number	"\<\d\+\%(\s\+\d\+\)*\>"
+
+syn match  algol68Float		"\c\.\d\+\%(\s\+\d\+\)*\%(\s*[e\\⏨]\s*[-+]\?\s*\d\+\%(\s\+\d\+\)*\)\?\>"
+syn match  algol68Float		"\c\<\d\+\%(\s\+\d\+\)*\%(\s*[e\\⏨]\s*[-+]\?\s*\d\+\%(\s\+\d\+\)*\)\>"
+syn match  algol68Float		"\c\<\d\+\%(\s\+\d\+\)*\s*\.\s*\d\+\%(\s\+\d\+\)*\%(\s*[e\\⏨]\s*[-+]\?\s*\d\+\%(\s\+\d\+\)*\)\?\>"
+
+syn match  algol68HexNumber	"\c\<2r\s*[01]\+\%(\s\+[01]\+\)*\>"
+syn match  algol68HexNumber	"\c\<4r\s*[0-3]\+\%(\s\+[0-3]\+\)*\>"
+syn match  algol68HexNumber	"\c\<8r\s*[0-7]\+\%(\s\+[0-7]\+\)*\>"
+syn match  algol68HexNumber	"\c\<16r\s*[0-9a-f]\+\%(\s\+[0-9a-f]\+\)*\>"
+
+
+syn region algol68Special	start="\$"  end="\$" contains=algol68String
+syn region algol68Comment	start="¢"  end="¢" contains=algol68Todo,algol68SpaceError
+syn region algol68Comment	start="£"  end="£" contains=algol68Todo,algol68SpaceError
+syn region algol68Comment	start="#"  end="#" contains=algol68Todo,algol68SpaceError
+syn region algol68Comment	start="\<CO\>"  end="\<CO\>" contains=algol68Todo,algol68SpaceError
+syn region algol68Comment	start="\<COMMENT\>"  end="\<COMMENT\>" contains=algol68Todo,algol68SpaceError
+syn region algol68PreProc	start="\<PR\>"  end="\<PR\>" contains=algol68Todo,algol68SpaceError
+syn region algol68PreProc	start="\<PRAGMAT\>"  end="\<PRAGMAT\>" contains=algol68Todo,algol68SpaceError
+" algol68r
+syn region algol68Comment	start="{"  end="}" contains=algol68Todo,algol68SpaceError
+syn region algol68Comment	start="{{{"  end="}}}" contains=algol68Todo,algol68SpaceError
+
+" ALGOL 68r
+syn keyword algol68PreProc DECS CONTEXT configinfo A68CONFIG KEEP FINISH USE SYSPROCS IOSTATE FORALL
+" ALGOL 68c
+syn keyword algol68PreProc USING ENVIRON FOREACH ASSERT
+
+if !exists("algol68_no_preludes")
+
+
+"  THE STANDARD ENVIRONMENT
+
+"      Enquiries
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(blank\|formfeed\|newline\|null\|tab\|eof\)\s*char\%(acter\)\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(max\s*abs\|exp\|error\)\s*char\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(long\s*\)\?long\s*\)\?max\s*\%(bits\|int\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(long\s*\)\?long\s*\)\?\%(max\|min\|small\)\s*real\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(\%(long\s*\)\?long\s*\)\?\%(bits\|bytes\|exp\|int\|real\)\s*width\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(bits\|bytes\|compl\|int\|real\)\s*\%(lengths\|shorths\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(blank\|flip\|flop\)\>\%(\s*[a-z0-9]\)\@!"
+
+"      Transput Files and Channels
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<stand\s*\%(in\|out\|back\|error\)\%(\s*channel\)\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<stand\s*draw\s*channel\>\%(\s*[a-z0-9]\)\@!"
+
+"      Transput Event Routines
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<on\s*\%(\%(line\|page\|\%(logical\s*\|physical\s*\)\?file\|format\)\s*\)end\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<on\s*\%(\%(format\|value\|open\|transput\)\s*\)error\>\%(\s*[a-z0-9]\)\@!"
+
+"      Connections to Files
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(open\|establish\|append\|create\|associate\|close\|lock\|erase\|scratch\)\>\%(\s*[a-z0-9]\)\@!"
+
+"      Positioning on Files
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<new\s*line\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<new\s*page\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<back\s*space\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(reset\|rewind\|rewrite\|set\|seek\|space\)\>\%(\s*[a-z0-9]\)\@!"
+
+"      I/O on Files (Standard)
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(get\|put\|print\|read\|write\)\%(f\|\s*bin\)\?\>\%(\s*[a-z0-9]\)\@!"
+
+"      I/O on Files (Algol68C)
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(print\|read\)\s*\%(\%(long\s*\)\?long\s*\)\?\%(int\|real\|complex\|bits\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(print\|read\)\s*\%(bool\|char\|string\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<read\s*line\>\%(\s*[a-z0-9]\)\@!"
+
+"      Enquiries on Files
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(get\|put\|bin\|set\|reset\|rewind\|reidf\|draw\)\s*possible\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<end\s*of\s*\%(file\|line\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(make\s*\)\?term\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(compressible\|eof\|eoln\)\>\%(\s*[a-z0-9]\)\@!"
+
+"      Keyboard Control
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cooked\|raw\)\>\%(\s*[a-z0-9]\)\@!"
+
+"      Math Constants
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(long\s*\)\?long\s*\)\?\%(min\s*real\|\%(minus\s*\)\?infinity\|\%(min\s*\)\?inf\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(\%(long\s*\)\?long\s*\)\|[qd]\)\?pi\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<mp\s*radix\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<nan\>\%(\s*[a-z0-9]\)\@!"
+
+"      Math Basic Functions
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\%([a-z0-9]\s\+\)\@8<!\<\%(\%(\%(long\s*\)\?long\s*\)\|[qd]\)\?\%(sqrt\|cbrt\|curt\|exp\|ln\|log\)\>\%(\s*[a-z0-9]\)\@!\%(\s\{1,7}[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<ln\s*abs\>\%(\s*[a-z0-9]\)\@!"
+
+"      Math Trigonometric Functions
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(\%(long\s*\)\?long\s*\)\|[qd]\)\?\%(arc\s*\|a\)\?\%(sin\|cos\|tan\|cot\|sec\|csc\|cas\)\%(h\|\%(\s*dg\)\)\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(\%(long\s*\)\?long\s*\)\|[qd]\)\?\%(arc\s*\|a\)\?tan2\%(\s*dg\)\?\>\%(\s*[a-z0-9]\)\@!"
+  " long-long-sinpi/cospi/tanpi/cotpi
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(\%(long\s*\)\?long\s*\)\|[qd]\)\?\%(sin\|cos\|tan\|cot\)\s*pi\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<ln\s*\%(sinh\|cosh\)\>\%(\s*[a-z0-9]\)\@!"
+  " a special case in Genie?
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<atan\s*int\>\%(\s*[a-z0-9]\)\@!"
+
+"      Random Number Generator
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(long\s*\)\?long\s*\)\?\%(next\s*\)\?random\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<first\s*random\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<rnd\>\%(\s*[a-z0-9]\)\@!"
+
+"      Garbage Collection and Memory
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<collect\s*seconds\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<garbage\%(\s*\%(collections\|freed\|refused\|seconds\)\)\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<gc\s*heap\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<on\s*gc\s*event\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<preemptive\s*\%(gc\|sweep\%(\s*heap\)\?\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<sweep\s*heap\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<sweeps\%(\s*refused\)\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(system\s*\)\?\%(heap\|stack\)\s*pointer\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(actual\|system\)\s*stack\s*size\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(blocks\|collections\)\>\%(\s*[a-z0-9]\)\@!"
+
+"      I/O on Strings
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(puts\|gets\|string\)f\?\>\%(\s*[a-z0-9]\)\@!"
+"      Character Type Tests
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<is\s*\%(alnum\|alpha\|cntrl\|digit\|graph\|lower\|print\|punct\|space\|upper\|xdigit\)\>\%(\s*[a-z0-9]\)\@!"
+"      Operations on Characters
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<to\s*\%(upper\|lower\)\>\%(\s*[a-z0-9]\)\@!"
+"      Search in Strings
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(char\|last\s*char\|string\)\s*in\s*string\>\%(\s*[a-z0-9]\)\@!"
+
+"      Time and Date
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cpu\|wall\|utc\|local\)\s*time\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(wall\s*\)\?clock\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(wall\s*\)\?seconds\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<sleep\>\%(\s*[a-z0-9]\)\@!"
+
+"      Type Operations
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(long\s*\)\?\%(bits\|bytes\)\s*pack\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(long\s*long\s*\)\?bits\s*pack\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\%([a-z0-9]\s\+\)\@8<!\<\%(bits\|whole\|fixed\|float\|real\)\>\%(\s*[a-z0-9]\)\@!\%(\s*[a-z0-9]\)\@!"
+
+"      Runtime
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(program\s*\)\?idf\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(backtrace\|break\|debug\|monitor\|abend\|evaluate\|system\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(i32\|i64\|r64\|r128\)mach\>\%(\s*[a-z0-9]\)\@!"
+
+
+"  UNIX EXTENSIONS
+
+"      Environment Functions
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(a68g\s*\)\?\%(argc\|argv\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<get\s*env\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<reset\s*errno\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<str\s*error\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(get\|set\)\s*pwd\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(rows\|columns\|abend\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<errno\>\%(\s*[a-z0-9]\)\@!"
+
+"      Processes
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<execve\%(\s*child\%(\s*pipe\)\?\|\s*output\)\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<exec\%(\s*sub\%(\s*pipeline\|\s*output\)\?\)\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<fork\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<wait\s*pid\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<create\s*pipe\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<peek\s*char\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<sig\s*segv\>\%(\s*[a-z0-9]\)\@!"
+
+"      File types and attributes
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<file\s*is\s*\%(block\s*device\|char\s*device\|directory\|regular\|fifo\|link\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<file\s*mode\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<get\s*directory\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<real\s*path\>\%(\s*[a-z0-9]\)\@!"
+
+"      Fetching web page contents and sending requests
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<https\?\s*\%(content\|timeout\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<tcp\s*request\>\%(\s*[a-z0-9]\)\@!"
+
+"      Regular expressions in string manipulation
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<grep\s*in\s*\%(sub\)\?string\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<sub\s*in\s*string\>\%(\s*[a-z0-9]\)\@!"
+
+"      Curses support
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<curses\s*\%(start\|end\|clear\|refresh\|get\s*char\|put\s*char\|move\|lines\|columns\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<curses\s*\%(green\|cyan\|red\|yellow\|magenta\|blue\|white\)\%(\s*inverse\)\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<curses\s*del\s*char\>\%(\s*[a-z0-9]\)\@!"
+
+
+"  POSTGRESQL CLIENT ROUTINES
+
+"      Connecting to a server
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<pq\s*\%(connect\s*db\|finish\|reset\|parameter\s*status\)\>\%(\s*[a-z0-9]\)\@!"
+
+"      Sending queries and retrieving results
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<pq\s*\%(exec\|ntuples\|nfields\|fname\|fnumber\|fformat\|get\s*is\s*null\|get\s*value\|cmd\s*status\|cmd\s*tuples\)\>\%(\s*[a-z0-9]\)\@!"
+
+"      Connection status information
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<pq\s*\%(\%(result\s*\)\?error\s*message\|db\|user\|pass\|host\|port\|tty\|options\|\%(protocol\|server\)\s*version\|socket\|backend\s*pid\)\>\%(\s*[a-z0-9]\)\@!"
+
+
+"  SOUND
+
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(new\|get\|set\)\s*sound\>\%(\s*[a-z0-9]\)\@!"
+  syn keyword algol68Operator RESOLUTION CHANNELS RATE SAMPLES
+
+
+"  DRAWING USING THE GNU PLOTTING UTILITIES
+
+"      Setting up a graphics device
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<draw\s*\%(device\|erase\|show\|move\|aspect\|fill\s*style\|line\s*style\|line\s*width\|clear\|flush\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<make\s*device\>\%(\s*[a-z0-9]\)\@!"
+
+"      Specifying colours
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<draw\s*\%(\%(background\s*\)\?colou\?r\%(\s*name\)\?\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<draw\s*get\s*colou\?r\s*name\>\%(\s*[a-z0-9]\)\@!"
+
+"      Drawing objects
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<draw\s*\%(point\|line\|rect\|circle\|ball\|star\)\>\%(\s*[a-z0-9]\)\@!"
+
+"      Drawing text
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<draw\s*\%(text\%(\s*angle\)\?\|font\s*\%(name\|size\)\)\>\%(\s*[a-z0-9]\)\@!"
+
+
+"  EXTRA NUMERICAL PROCEDURES
+
+"      COMPLEX Functions
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(\%(long\s*\)\?long\s*\)\|[qd]\)\?c\%(omplex\s*\)\?\%(sqrt\|exp\|ln\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(long\s*\)\?long\s*\)\?complex\s*\%(arc\s*\)\?\%(sin\|cos\|tan\)h\?\>\%(\s*[a-z0-9]\)\@!"
+  " cas casin casinh dcas dcasin dcasinh qcas qcasin qcasinh longcas longlongcas
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(\%(long\s*\)\?long\s*\)\|[dq]\?\)ca\?\%(sin\|cos\|tan\)h\?\>\%(\s*[a-z0-9]\)\@!"
+  " a special case in Genie?
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<long\s*complex\s*atanh\>\%(\s*[a-z0-9]\)\@!"
+
+"      REAL Airy Functions
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<airy\s*[ab]i\%(\s*deriv\)\?\%(\s*scaled\)\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<airy\s*[ab]i\%(\s*derivative\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<airy\s*zero\s*[ab]i\%(\s*deriv\)\?\>\%(\s*[a-z0-9]\)\@!"
+
+"      REAL Bessel Functions
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<bessel\s*\%(jn\|yn\|in\|exp\s*in\|kn\|exp\s*kn\|jl\|yl\|exp\s*il\|exp\s*kl\|jnu\|ynu\|inu\|exp\s*inu\|knu\|exp\s*knu\)\>\%(\s*[a-z0-9]\)\@!"
+
+  " only a few could be sensibly merged; we keep them apart
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<bessel\s*\%(il[012]\?\s*scaled\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<bessel\s*\%(in[01]\%(\s*scaled\)\?\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<bessel\s*\%(in\s*u\?\s*scaled\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<bessel\s*\%(j\%(\l[012]\|n[01]\)\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<bessel\s*\%(kl[012]\?\s*scaled\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<bessel\s*\%(kn[01]\%(\s*scaled\)\?\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<bessel\s*\%(kn\s*[u_]\?\s*scaled\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<bessel\s*ln\s*knu\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<bessel\s*\%(y\%(\l[012]\|n[01]\)\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<bessel\s*zero\s*j\%([01]\|nu\)\>\%(\s*[a-z0-9]\)\@!"
+
+"      REAL Elliptic Integrals
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<elliptic\s*integral\s*\%(k\|e\|rf\<rd\|rj\|rc\)\>\%(\s*[a-z0-9]\)\@!"
+
+"      REAL Error and Gamma Functions
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(ln\s*\)\?\%(fact\|choose\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<prime\s*factors\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(\%(long\s*\)\?long\s*\)\|[qd]\)\?\%(inv\%(erse\)\?\s*\)\?erfc\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<mpfr\s*\%(\%(\%(long\s*\)\?long\s*\)\|q\)\?\%(inv\s*\)\?erfc\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(\%(\%(mpfr\s*\)\?long\s*\)\?long\s*\)\|\%(d\|\%(mpfr\s*\)\?q\)\)\?\%(beta\|gamma\)\%(\s*inc\s*g\?f\?\)\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<beta\s*inc\s*gsl\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(\%(\%(\%(mpfr\s*\)\?long\s*\)\?long\s*\)\|\%(d\|\%(mpfr\s*\)\?q\)\)\?ln\s*\%(beta\|gamma\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<mpfr\s*mp\>\%(\s*[a-z0-9]\)\@!"
+  " is the following a special case in Genie?
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<mpfr\s*\%(long\s*\|d\)gamma\s*inc\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "gamma\s*\%(\%(inc\s*\%(gsl\|[pq]\)\)\|inv\|star\)\>\%(\s*\%([a-z_]\|\l\d\+\)\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<lj[ef]\s*126\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<ln1p\>\%(\s*[a-z0-9]\)\@!"
+
+
+
+"      Scaling Factors
+
+  " strangely missing some common factors (hecto, deca, deci, centi),
+  " also myria, and the more extreme factors (quetta, ronna, ronto, quecto)
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<num\s*\%(yotta\|zetta\|exa\|peta\|tera\|giga\|mega\|kilo\|milli\|micro\|nano\|pico\|femto\|atto\|zepto\|yocto\)\>\%(\s*[a-z0-9]\)\@!"
+
+
+"      Physical Constants
+
+"          Fundamental Constants
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cgs\|mksa\)\s*\%(boltzmann\|faraday\|gauss\|hectare\|\%(kilometers\|miles\)\s*per\s*hour\|micron\|molar\s*gas\|planck\s*constant\%(\s*bar\)\?\|speed\s*of\s*light\|standard\s*gas\s*volume\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<mksa\s*vacuum\s*\%(permeability\|permittivity\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<num\s*avogadro\>\%(\s*[a-z0-9]\)\@!"
+
+"          Astronomy and Astrophysics
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cgs\|mksa\)\s*\%(astronomical\s*unit\|grav\s*accel\|gravitational\s*constant\|light\s*year\|parsec\|solar\s*mass\)\>\%(\s*[a-z0-9]\)\@!"
+
+"          Atomic and Nuclear Physics
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cgs\|mksa\)\s*\%(angstrom\|barn\|bohr\s*magneton\|bohr\s*radius\|electron\s*\%(charge\|magnetic\s*moment\|volt\)\|mass\s*\%(electron\|muon\|neutron\|proton\)\|nuclear\s*magneton\|proton\s*magnetic\s*moment\|rydberg\|unified\s*atomic\s*mass\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<num\s*fine\s*structure\>\%(\s*[a-z0-9]\)\@!"
+
+"          Time
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cgs\|mksa\)\s*\%(day\|hour\|minute\|week\)\>\%(\s*[a-z0-9]\)\@!"
+
+"          Imperial units
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cgs\|mksa\)\s*\%(foot\|inch\|mil\|mile\|yard\|\%(tex\)\?point\)\>\%(\s*[a-z0-9]\)\@!"
+
+"          Nautical units
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cgs\|mksa\)\s*\%(fathom\|knot\|nautical\s*mile\)\>\%(\s*[a-z0-9]\)\@!"
+
+"          Volume
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cgs\|mksa\)\s*\%(acre\|\%(canadian\|uk\|us\)\s*gallon\|liter\|pint\|quart\|cup\|fluid\s*ounce\|\%(table\|tea\)\s*spoon\)\>\%(\s*[a-z0-9]\)\@!"
+
+"          Mass and weight
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cgs\|mksa\)\s*\%(carat\|\%(gram\|\%(kilo\s*\)\?pound\)\s*force\|\%(metric\s*\|uk\s*\)\?ton\|\%(ounce\|pound\)\s*mass\|poundal\|troy\s*ounce\)\>\%(\s*[a-z0-9]\)\@!"
+
+"          Thermal energy and power
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cgs\|mksa\)\s*\%(btu\|calorie\|horsepower\|therm\)\>\%(\s*[a-z0-9]\)\@!"
+
+"          Pressure
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cgs\|mksa\)\s*\%(bar\|inch\s*of\s*\%(mercury\|water\)\|meter\s*of\s*mercury\|psi\|std\s*atmosphere\|torr\)\>\%(\s*[a-z0-9]\)\@!"
+
+"          Viscosity
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cgs\|mksa\)\s*\%(poise\|stokes\)\>\%(\s*[a-z0-9]\)\@!"
+
+"          Light and illumination
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cgs\|mksa\)\s*\%(foot\s*candle\|foot\s*lambert\|lambert\|lumen\|lux\|phot\|stilb\)\>\%(\s*[a-z0-9]\)\@!"
+
+"          Radioactivity
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cgs\|mksa\)\s*\%(curie\|rad\|roentgen\)\>\%(\s*[a-z0-9]\)\@!"
+
+"          Force and energy
+  syn match algol68Predefined "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(cgs\|mksa\)\s*\%(dyne\|erg\|joule\|newton\)\>\%(\s*[a-z0-9]\)\@!"
+
+
+" Functions from GSL
+
+  syn keyword algol68Operator	CV RV T INV PINV MEAN DET TRACE NORM DYAD BEFORE ABOVE
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<angle\s*restrict\s*\%(pos\|symm\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<conical\s*p\s*\%([01]\|cylreg\|m\?half\|sph\s*reg\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<cholesky\s*\%(decomp\|solve\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<debye\s*[1-6]\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<ellint\s*\%([defp]\|[ekp]\s*comp\|r[cdfj]\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(expint\s*\%(3\|e[12in]\)\|expm1\|exprel[2n]\?\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<fermi\s*dirac\s*\%([012]\|3\?half\|inc0\|int\|m1\|mhalf\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<fft\s*\%(complex\s*\)\?\%(forward\|backward\|inverse\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(gegenpoly\|laguerre\)\s*[123n]\s*real\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<lambert\s*\%(w0\|wm1\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<legendre\s*\%(h3d\%([01]\)\?\|p[123l]\|q[01l]\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<pseudo\s*inv\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<psi\s*\%(1\%(\s*int\|\s*piy\)\?\|int\|n\)\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<synchrotron\s*[12]\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<taylor\s*coeff\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<transport\s*[2-5]\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<zeta\%(\s*m1\)\?\%(\s*int\)\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(chi\|ci\|clausen\|dawson\|digamma\|dilog\|\%(ln\s*\)\?doublefact\|eta\|eta\s*int\|hermite\s*func\|hypot\|hzeta\|laplace\|shi\|si\|sinc\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<ln1\s*\%(plusx\%(mx\)\?\)\?\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(compl\s*\)\?\%(matrix\|vector\)\s*echo\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<print\s*\%(matrix\|vector\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(complex\s*\)\?lu\s*\%(decomp\|det\|inv\|solve\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<left\s*columns\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(ols\|tls\|pcacv\|pcasvd\|pcr\|pls[12]\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<\%(ln\s*poch\|poch\s*\%(rel\)\?\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<qr\s*\%(decomp\|\%(ls\s*\)\?solve\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<svd\s*\%(decomp\|solve\)\>\%(\s*[a-z0-9]\)\@!"
+
+
+" Functions from R Mathlib
+
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<r\s*[dpqr]n\?\s*binom\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<r\s*\%(di\|tri\|tetra\|penta\|psi\)\s*gamma\>\%(\s*[a-z0-9]\)\@!"
+  " note: Genie documents 'r rn chisq' but it's missing in the code?
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<r\s*[dpqr]n\?\s*chisq\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<r\s*[dpqr]\%(\s*n\)\?\s*f\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<r\s*[dpq]\%(\s*n\)\?\s*t\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<r\s*[dpqr]\s*\%(l\s*\)\?norm\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<r\s*[dpqr]\s*\%(beta\|cauchy\|exp\|geom\|hyper\|logis\|pois\|sign\s*rank\|t\|unif\|weibull\|wilcox\)\>\%(\s*[a-z0-9]\)\@!"
+  syn match algol68Function "\%(\%([a-z_]\|\l\d\+\)\s\+\)\@8<!\<r\s*[pq]\s*tu\s*key\>\%(\s*[a-z0-9]\)\@!"
+
+
+endif
+
+" Define the default highlighting.
+hi def link algol68Boolean		Boolean
+hi def link algol68Comment		Comment
+hi def link algol68Conditional		Conditional
+hi def link algol68Constant		Constant
+hi def link algol68Float		Float
+hi def link algol68Function		Function
+hi def link algol68Label		Label
+hi def link algol68MatrixDelimiter	Identifier
+hi def link algol68HexNumber		Number
+hi def link algol68Number		Number
+hi def link algol68Operator		Operator
+hi def link algol68Predefined		Identifier
+hi def link algol68PreProc		PreProc
+hi def link algol68Repeat		Repeat
+hi def link algol68SpaceError		Error
+hi def link algol68Statement		Statement
+hi def link algol68String		String
+hi def link algol68StringEscape		Special
+hi def link algol68Struct		algol68Statement
+hi def link algol68SymbolOperator	algol68Operator
+hi def link algol68Todo			Todo
+hi def link algol68Type			Type
+hi def link algol68ShowTab		Error
+
+let b:current_syntax = "algol68"
+
+" vim: ts=8 sw=2
diff --git a/runtime/syntax/dockerfile.vim b/runtime/syntax/dockerfile.vim
index f1d612f4ad..17b32d2942 100644
--- a/runtime/syntax/dockerfile.vim
+++ b/runtime/syntax/dockerfile.vim
@@ -1,6 +1,7 @@
 " dockerfile.vim - Syntax highlighting for Dockerfiles
 " Maintainer:   Honza Pokorny <https://honza.ca>
 " Last Change:  2024 Dec 20
+"               2026 Mar 26 by Vim Project: dockerfileShell comments (#19829)
 " License:      BSD
 
 " https://docs.docker.com/engine/reference/builder/
@@ -31,7 +32,7 @@ syntax match dockerfileInstruction contained /\v<(SHELL|VOLUME)>/
 
 syntax region dockerfileString contained start=/\v"/ skip=/\v\\./ end=/\v"/
 syntax region dockerfileJSON   contained keepend start=/\v\[/ skip=/\v\\\_./ end=/\v$/ contains=@JSON
-syntax region dockerfileShell  contained keepend start=/\v/ skip=/\v\\\_./ end=/\v$/ contains=@Shell
+syntax region dockerfileShell  contained keepend start=/\v/ skip=/\v\\\_.|^\s*#.*/ end=/\v$/ contains=@Shell
 syntax region dockerfileValue  contained keepend start=/\v/ skip=/\v\\\_./ end=/\v$/ contains=dockerfileString
 
 syntax region dockerfileComment start=/\v^\s*#/ end=/\v$/ contains=@Spell
diff --git a/runtime/syntax/javascript.vim b/runtime/syntax/javascript.vim
index c89fcedce6..c910a668a2 100644
--- a/runtime/syntax/javascript.vim
+++ b/runtime/syntax/javascript.vim
@@ -1,18 +1,12 @@
 " Vim syntax file
-" Language:	JavaScript
-" Maintainer:	Claudio Fleiner <claudio@fleiner.com>
-" Updaters:	Scott Shattuck (ss) <ss@technicalpursuit.com>
-" URL:		http://www.fleiner.com/vim/syntax/javascript.vim
-" Changes:	(ss) added keywords, reserved words, and other identifiers
-"		(ss) repaired several quoting and grouping glitches
-"		(ss) fixed regex parsing issue with multiple qualifiers [gi]
-"		(ss) additional factoring of keywords, globals, and members
-" Last Change:	2022 Jun 09
-" 		2013 Jun 12: adjusted javaScriptRegexpString (Kevin Locke)
-" 		2018 Apr 14: adjusted javaScriptRegexpString (LongJohnCoder)
-" 		2024 Aug 14: fix a few stylistic issues (#15480)
-" 		2025 Aug 07: as is a reserved keyword (#17912)
-" 		2025 Sep 24: using is a reserved keyword (Devin Weaver)
+" Language:		JavaScript
+" Maintainer:		This runtime file is looking for a maintainer.
+" Previous Maintainer:	Claudio Fleiner <claudio@fleiner.com>
+" Contributors:		Scott Shattuck <ss@technicalpursuit.com>
+" 			Kevin Locke
+" 			LongJohnCoder
+" 			Devin Weaver
+" Last Change:		2026 Apr 26
 
 " tuning parameters:
 " unlet javaScript_fold
@@ -52,7 +46,14 @@ syn match   javaScriptNumber           "\<\d\+\(_\d\+\)*[eE][+-]\?\d\+\>"
 syn match   javaScriptNumber           "\<[1-9]\d*\(_\d\+\)*\(\.\(\d\+\(_\d\+\)*\([eE][+-]\?\d\+\)\?\)\?\)\?\>"
 syn match   javaScriptNumber           "\<\(\d\+\(_\d\+\)*\)\?\.\d\+\(_\d\+\)*\([eE][+-]\?\d\+\)\?\>"
 syn match   javaScriptNumber           "\<\d\+\(_\d\+\)*\.\(\d\+\(_\d\+\)*\([eE][+-]\?\d\+\)\?\)\?\>"
-syn region  javaScriptRegexpString     start=+[,(=+]\s*/[^/*]+ms=e-1,me=e-1 skip=+\\\\\|\\/+ end=+/[gimuys]\{0,2\}\s*$+ end=+/[gimuys]\{0,2\}\s*[+;.,)\]}]+me=e-1 end=+/[gimuys]\{0,2\}\s\+\/+me=e-1 contains=@htmlPreproc,javaScriptComment oneline
+syn region  javaScriptRegexpString
+      \ start=+\%([,(=+]\s*\)\@8<=/[^/*]+
+      \ skip=+\\\\\|\\/+
+      \ end=+/[dgimsuvy]\{0,7\}\ze\s*$+
+      \ end=+/[dgimsuvy]\{0,7\}\ze\s*[+;.,)\]}]+
+      \ end=+/[dgimsuvy]\{0,7\}\ze\s\+\/+
+      \ contains=@htmlPreproc,javaScriptComment
+      \ oneline
 
 syn keyword javaScriptConditional	if else switch
 syn keyword javaScriptRepeat		while for do in of