new file mode 100644
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+++ b/runtime/syntax/modula2/opt/r10.vim
@@ -0,0 +1,452 @@
+" Vim syntax file
+" Language:    Modula-2 (R10)
+" Maintainer:  B.Kowarsch <trijezdci@moc.liamg>
+" Last Change: 2020 June 18 (moved repository from bb to github)
+
+" ----------------------------------------------------
+" THIS FILE IS LICENSED UNDER THE VIM LICENSE
+" see https://github.com/vim/vim/blob/master/LICENSE
+" ----------------------------------------------------
+
+" Remarks:
+" Vim Syntax files are available for the following Modula-2 dialects:
+" * for the PIM dialect : m2pim.vim
+" * for the ISO dialect : m2iso.vim
+" * for the R10 dialect : m2r10.vim (this file)
+
+" -----------------------------------------------------------------------------
+" This syntax description follows the Modula-2 Revision 2010 language report
+" (Kowarsch and Sutcliffe, 2015) available at http://modula-2.info/m2r10.
+" -----------------------------------------------------------------------------
+
+" Parameters:
+"
+" Vim's filetype script recognises Modula-2 dialect tags within the first 200
+" lines of Modula-2 .def and .mod input files.  The script sets filetype and
+" dialect automatically when a valid dialect tag is found in the input file.
+" The dialect tag for the R10 dialect is (*!m2r10*).  It is recommended to put
+" the tag immediately after the module header in the Modula-2 input file.
+"
+" Example:
+"  DEFINITION MODULE Foolib; (*!m2r10*)
+"
+" Variable g:modula2_default_dialect sets the default Modula-2 dialect when the
+" dialect cannot be determined from the contents of the Modula-2 input file:
+" if defined and set to 'm2r10', the default dialect is R10.
+"
+" Variable g:modula2_r10_allow_lowline controls support for lowline in identifiers:
+" if defined and set to a non-zero value, they are recognised, otherwise not
+"
+" Variables may be defined in Vim startup file .vimrc
+"
+" Examples:
+"  let g:modula2_default_dialect = 'm2r10'
+"  let g:modula2_r10_allow_lowline = 1
+
+
+if exists("b:current_syntax")
+  finish
+endif
+
+" Modula-2 is case sensitive
+syn case match
+
+
+" -----------------------------------------------------------------------------
+" Reserved Words
+" -----------------------------------------------------------------------------
+" Note: MODULE, PROCEDURE and END are defined separately further below
+syn keyword modula2Resword ALIAS AND ARGLIST ARRAY BEGIN CASE CONST COPY DEFINITION
+syn keyword modula2Resword DIV DO ELSE ELSIF EXIT FOR FROM GENLIB IF IMPLEMENTATION
+syn keyword modula2Resword IMPORT IN LOOP MOD NEW NOT OF OPAQUE OR POINTER READ
+syn keyword modula2Resword RECORD RELEASE REPEAT RETAIN RETURN SET THEN TO TYPE
+syn keyword modula2Resword UNTIL VAR WHILE WRITE YIELD
+
+
+" -----------------------------------------------------------------------------
+" Schroedinger's Tokens
+" -----------------------------------------------------------------------------
+syn keyword modula2SchroedToken CAPACITY COROUTINE LITERAL
+
+
+" -----------------------------------------------------------------------------
+" Builtin Constant Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2ConstIdent NIL FALSE TRUE
+
+
+" -----------------------------------------------------------------------------
+" Builtin Type Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2TypeIdent BOOLEAN CHAR UNICHAR OCTET
+syn keyword modula2TypeIdent CARDINAL LONGCARD INTEGER LONGINT REAL LONGREAL
+
+
+" -----------------------------------------------------------------------------
+" Builtin Procedure and Function Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2ProcIdent APPEND INSERT REMOVE SORT SORTNEW
+syn keyword modula2FuncIdent CHR ORD ODD ABS SGN MIN MAX LOG2 POW2 ENTIER
+syn keyword modula2FuncIdent PRED SUCC PTR COUNT LENGTH
+
+
+" -----------------------------------------------------------------------------
+" Builtin Macro Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2MacroIdent NOP TMIN TMAX TSIZE TLIMIT
+
+
+" -----------------------------------------------------------------------------
+" Builtin Primitives
+" -----------------------------------------------------------------------------
+syn keyword modula2PrimitiveIdent SXF VAL STORE VALUE SEEK SUBSET
+
+
+" -----------------------------------------------------------------------------
+" Unsafe Facilities via Pseudo-Module UNSAFE
+" -----------------------------------------------------------------------------
+syn keyword modula2UnsafeIdent UNSAFE BYTE WORD LONGWORD OCTETSEQ
+syn keyword modula2UnsafeIdent ADD SUB INC DEC SETBIT HALT
+syn keyword modula2UnsafeIdent ADR CAST BIT SHL SHR BWNOT BWAND BWOR
+
+
+" -----------------------------------------------------------------------------
+" Non-Portable Language Extensions
+" -----------------------------------------------------------------------------
+syn keyword modula2NonPortableIdent ASSEMBLER ASM REG
+
+
+" -----------------------------------------------------------------------------
+" User Defined Identifiers
+" -----------------------------------------------------------------------------
+syn match modula2Ident "[a-zA-Z][a-zA-Z0-9]*\(_\)\@!"
+syn match modula2LowLineIdent "[a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)\+"
+
+syn match modula2ReswordDo "\(TO\)\@<!DO"
+syn match modula2ReswordTo "TO\(\sDO\)\@!"
+
+" TODO: support for OpenVMS reswords and identifiers which may include $ and %
+
+
+" -----------------------------------------------------------------------------
+" String Literals
+" -----------------------------------------------------------------------------
+syn region modula2String start=/"/ end=/"/ oneline
+syn region modula2String start="\(^\|\s\|[({=<>&#,]\|\[\)\@<='" end=/'/ oneline
+
+
+" -----------------------------------------------------------------------------
+" Numeric Literals
+" -----------------------------------------------------------------------------
+syn match modula2Base2Num "0b[01]\+\('[01]\+\)*"
+syn match modula2Base16Num "0[ux][0-9A-F]\+\('[0-9A-F]\+\)*"
+
+"| *** VMSCRIPT BUG ALERT ***
+"| The regular expression below causes errors when split into separate strings
+"|
+"| syn match modula2Base10Num
+"|   \ "\(\(0[bux]\@!\|[1-9]\)[0-9]*\('[0-9]\+\)*\)" .
+"|   \ "\(\.[0-9]\+\('[0-9]\+\)*\(e[+-]\?[0-9]\+\('[0-9]\+\)*\)\?\)\?"
+"|
+"| E475: Invalid argument: modula2Base10Num "\(\(0[bux]\@!\|[1-9]\)[0-9]*\('[0-9]\+\)*\)"
+"|  . "\(\.[0-9]\+\('[0-9]\+\)*\(e[+-]\?[0-9]\+\('[0-9]\+\)*\)\?\)\?"
+"|
+"| However, the same regular expression works just fine as a sole string.
+"|
+"| As a consequence, we have no choice but to put it all into a single line
+"| which greatly diminishes readability and thereby increases the opportunity
+"| for error during maintenance. Ideally, regular expressions should be split
+"| into small human readable pieces with interleaved comments that explain
+"| precisely what each piece is doing.  Vimscript imposes poor design. :-(
+
+syn match modula2Base10Num
+  \ "\(\(0[bux]\@!\|[1-9]\)[0-9]*\('[0-9]\+\)*\)\(\.[0-9]\+\('[0-9]\+\)*\(e[+-]\?[0-9]\+\('[0-9]\+\)*\)\?\)\?"
+
+
+" -----------------------------------------------------------------------------
+" Punctuation
+" -----------------------------------------------------------------------------
+syn match modula2Punctuation
+  \ "\.\|[,:;]\|\*\|[/+-]\|\#\|[=<>&]\|\^\|\[\|\]\|(\(\*\)\@!\|[){}]"
+
+
+" -----------------------------------------------------------------------------
+" Pragmas
+" -----------------------------------------------------------------------------
+syn region modula2Pragma start="<\*" end="\*>"
+  \ contains = modula2PragmaKey, modula2TechDebtPragma
+syn keyword modula2PragmaKey contained MSG IF ELSIF ELSE END INLINE NOINLINE OUT
+syn keyword modula2PragmaKey contained GENERATED ENCODING ALIGN PADBITS NORETURN
+syn keyword modula2PragmaKey contained PURITY SINGLEASSIGN LOWLATENCY VOLATILE
+syn keyword modula2PragmaKey contained FORWARD ADDR FFI FFIDENT
+
+syn match modula2DialectTag "(\*!m2r10\(+[a-z0-9]\+\)\?\*)"
+
+
+" -----------------------------------------------------------------------------
+" Line Comments
+" -----------------------------------------------------------------------------
+syn region modula2Comment start=/^!/ end=/$/ oneline
+
+
+" -----------------------------------------------------------------------------
+" Block Comments
+" -----------------------------------------------------------------------------
+syn region modula2Comment
+  \ start="\(END\s\)\@<!(\*\(!m2r10\(+[a-z0-9]\+\)\?\*)\)\@!" end="\*)"
+  \ contains = modula2Comment, modula2CommentKey, modula2TechDebtMarker
+
+syn match modula2CommentKey
+  \ "[Aa]uthor[s]\?\|[Cc]opyright\|[Ll]icense\|[Ss]ynopsis" contained
+syn match modula2CommentKey
+  \ "\([Pp]re\|[Pp]ost\|[Ee]rror\)\-condition[s]\?:" contained
+
+
+" -----------------------------------------------------------------------------
+" Block Statement Tails
+" -----------------------------------------------------------------------------
+syn match modula2ReswordEnd
+  \ "END" nextgroup = modula2StmtTailComment skipwhite
+syn match modula2StmtTailComment
+  \ "(\*\s\(IF\|CASE\|FOR\|LOOP\|WHILE\)\s\*)" contained
+
+
+" -----------------------------------------------------------------------------
+" Technical Debt Markers
+" -----------------------------------------------------------------------------
+syn match modula2ToDoHeader "TO DO"
+
+syn match modula2ToDoTail
+  \ "END\(\s(\*\sTO DO\s\*)\)\@=" nextgroup = modula2ToDoTailComment skipwhite
+syntax match modula2ToDoTailComment "(\*\sTO DO\s\*)" contained
+
+" contained within pragma
+syn keyword modula2TechDebtPragma contained DEPRECATED
+
+" contained within comment
+syn keyword modula2TechDebtMarker contained FIXME
+
+
+" -----------------------------------------------------------------------------
+" Disabled Code Sections
+" -----------------------------------------------------------------------------
+syn region modula2DisabledCode start="^?<" end="^>?"
+
+
+" -----------------------------------------------------------------------------
+" Headers
+" -----------------------------------------------------------------------------
+" !!! this section must be second last !!!
+
+" module header
+syn match modula2ModuleHeader
+  \ "\(MODULE\|BLUEPRINT\)\( [A-Z][a-zA-Z0-9]*\)\?"
+  \ contains = modula2ReswordModule, modula2ReswordBlueprint, modula2ModuleIdent
+
+syn match modula2ModuleIdent
+  \ "[A-Z][a-zA-Z0-9]*" contained
+
+syn match modula2ModuleTail
+  \ "END [A-Z][a-zA-Z0-9]*\.$"
+  \ contains = modula2ReswordEnd, modula2ModuleIdent, modula2Punctuation
+
+" procedure, sole occurrence
+syn match modula2ProcedureHeader
+  \ "PROCEDURE\(\s\[\|\s[a-zA-Z]\)\@!" contains = modula2ReswordProcedure
+
+" procedure header
+syn match modula2ProcedureHeader
+  \ "PROCEDURE [a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*"
+  \ contains = modula2ReswordProcedure,
+  \ modula2ProcedureIdent, modula2ProcedureLowlineIdent, modula2IllegalChar, modula2IllegalIdent
+
+" procedure binding to operator
+syn match modula2ProcedureHeader
+  \ "PROCEDURE \[[+-\*/\\=<>]\] [a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*"
+  \ contains = modula2ReswordProcedure, modula2Punctuation,
+  \ modula2ProcedureIdent, modula2ProcedureLowlineIdent, modula2IllegalChar, modula2IllegalIdent
+
+" procedure binding to builtin
+syn match modula2ProcedureHeader
+  \ "PROCEDURE \[[A-Z]\+\(:\([#\*,]\|++\|--\)\?\)\?\] [a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*"
+  \ contains = modula2ReswordProcedure,
+  \ modula2Punctuation, modula2Resword, modula2SchroedToken,
+  \ modula2ProcIdent, modula2FuncIdent, modula2PrimitiveIdent,
+  \ modula2ProcedureIdent, modula2ProcedureLowlineIdent, modula2IllegalChar, modula2IllegalIdent
+
+syn match modula2ProcedureIdent
+  \ "\([a-zA-Z]\)\([a-zA-Z0-9]*\)" contained
+
+syn match modula2ProcedureLowlineIdent
+  \ "[a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)\+" contained
+
+syn match modula2ProcedureTail
+  \ "END [a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*;$"
+  \ contains = modula2ReswordEnd,
+  \ modula2ProcedureIdent, modula2ProcedureLowLineIdent,
+  \ modula2Punctuation, modula2IllegalChar, modula2IllegalIdent
+
+syn keyword modula2ReswordModule contained MODULE
+syn keyword modula2ReswordBlueprint contained BLUEPRINT
+syn keyword modula2ReswordProcedure contained PROCEDURE
+syn keyword modula2ReswordEnd contained END
+
+
+" -----------------------------------------------------------------------------
+" Illegal Symbols
+" -----------------------------------------------------------------------------
+" !!! this section must be last !!!
+
+" any '`' '~' '@' '$' '%'
+syn match modula2IllegalChar "[`~@$%]"
+
+" any solitary sequence of '_'
+syn match modula2IllegalChar "\<_\+\>"
+
+" any '?' at start of line if not followed by '<'
+syn match modula2IllegalChar "^?\(<\)\@!"
+
+" any '?' not following '>' at start of line
+syn match modula2IllegalChar "\(\(^>\)\|\(^\)\)\@<!?"
+
+" any identifiers with leading occurrences of '_'
+syn match modula2IllegalIdent "_\+[a-zA-Z][a-zA-Z0-9]*\(_\+[a-zA-Z0-9]*\)*"
+
+" any identifiers containing consecutive occurences of '_'
+syn match modula2IllegalIdent
+  \ "[a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*\(__\+[a-zA-Z0-9]\+\(_[a-zA-Z0-9]\+\)*\)\+"
+
+" any identifiers with trailing occurrences of '_'
+syn match modula2IllegalIdent "[a-zA-Z][a-zA-Z0-9]*\(_\+[a-zA-Z0-9]\+\)*_\+\>"
+
+
+" -----------------------------------------------------------------------------
+" Define Rendering Styles
+" -----------------------------------------------------------------------------
+
+" highlight default link modula2PredefIdentStyle Keyword
+" highlight default link modula2ConstIdentStyle modula2PredefIdentStyle
+" highlight default link modula2TypeIdentStyle modula2PredefIdentStyle
+" highlight default link modula2ProcIdentStyle modula2PredefIdentStyle
+" highlight default link modula2FuncIdentStyle modula2PredefIdentStyle
+" highlight default link modula2MacroIdentStyle modula2PredefIdentStyle
+
+highlight default link modula2ConstIdentStyle Constant
+highlight default link modula2TypeIdentStyle Type
+highlight default link modula2ProcIdentStyle Function
+highlight default link modula2FuncIdentStyle Function
+highlight default link modula2MacroIdentStyle Function
+highlight default link modula2PrimitiveIdentStyle Function
+highlight default link modula2UnsafeIdentStyle Question
+highlight default link modula2NonPortableIdentStyle Question
+highlight default link modula2StringLiteralStyle String
+highlight default link modula2CommentStyle Comment
+highlight default link modula2PragmaStyle PreProc
+highlight default link modula2PragmaKeyStyle PreProc
+highlight default link modula2DialectTagStyle SpecialComment
+highlight default link modula2TechDebtMarkerStyle SpecialComment
+highlight default link modula2ReswordStyle Keyword
+highlight default link modula2HeaderIdentStyle Function
+highlight default link modula2UserDefIdentStyle Normal
+highlight default link modula2NumericLiteralStyle Number
+highlight default link modula2PunctuationStyle Delimiter
+highlight default link modula2CommentKeyStyle SpecialComment
+highlight default link modula2DisabledCodeStyle NonText
+
+
+" -----------------------------------------------------------------------------
+" Assign Rendering Styles
+" -----------------------------------------------------------------------------
+
+" headers
+highlight default link modula2ModuleIdent modula2HeaderIdentStyle
+highlight default link modula2ProcedureIdent modula2HeaderIdentStyle
+highlight default link modula2ModuleHeader modula2HeaderIdentStyle
+highlight default link modula2ModuleTail Normal
+highlight default link modula2ProcedureHeader Normal
+highlight default link modula2ProcedureTail Normal
+
+" lowline identifiers are rendered as errors if g:modula2_r10_allow_lowline is unset
+if exists("g:modula2_r10_allow_lowline")
+  if g:modula2_r10_allow_lowline != 0
+    highlight default link modula2ProcedureLowlineIdent modula2HeaderIdentStyle
+  else
+    highlight default link modula2ProcedureLowlineIdent Error
+  endif
+else
+  highlight default link modula2ProcedureLowlineIdent modula2HeaderIdentStyle
+endif
+
+" reserved words
+highlight default link modula2Resword modula2ReswordStyle
+highlight default link modula2ReswordModule modula2ReswordStyle
+highlight default link modula2ReswordProcedure modula2ReswordStyle
+highlight default link modula2ReswordEnd modula2ReswordStyle
+highlight default link modula2ReswordDo modula2ReswordStyle
+highlight default link modula2ReswordTo modula2ReswordStyle
+highlight default link modula2SchroedToken modula2ReswordStyle
+
+" predefined identifiers
+highlight default link modula2ConstIdent modula2ConstIdentStyle
+highlight default link modula2TypeIdent modula2TypeIdentStyle
+highlight default link modula2ProcIdent modula2ProcIdentStyle
+highlight default link modula2FuncIdent modula2FuncIdentStyle
+highlight default link modula2MacroIdent modula2MacroIdentStyle
+highlight default link modula2PrimitiveIdent modula2PrimitiveIdentStyle
+
+" unsafe and non-portable identifiers
+highlight default link modula2UnsafeIdent modula2UnsafeIdentStyle
+highlight default link modula2NonPortableIdent modula2NonPortableIdentStyle
+
+" user defined identifiers
+highlight default link modula2Ident modula2UserDefIdentStyle
+
+" lowline identifiers are rendered as errors if g:modula2_r10_allow_lowline is unset
+if exists("g:modula2_r10_allow_lowline")
+  if g:modula2_r10_allow_lowline != 0
+    highlight default link modula2LowLineIdent modula2UserDefIdentStyle
+  else
+    highlight default link modula2LowLineIdent Error
+  endif
+else
+  highlight default link modula2LowLineIdent modula2UserDefIdentStyle
+endif
+
+" literals
+highlight default link modula2String modula2StringLiteralStyle
+highlight default link modula2Base2Num modula2NumericLiteralStyle
+highlight default link modula2Base10Num modula2NumericLiteralStyle
+highlight default link modula2Base16Num modula2NumericLiteralStyle
+
+" punctuation
+highlight default link modula2Punctuation modula2PunctuationStyle
+
+" pragmas
+highlight default link modula2Pragma modula2PragmaStyle
+highlight default link modula2PragmaKey modula2PragmaKeyStyle
+highlight default link modula2DialectTag modula2DialectTagStyle
+
+" comments
+highlight default link modula2Comment modula2CommentStyle
+highlight default link modula2CommentKey modula2CommentKeyStyle
+highlight default link modula2ToDoTailComment modula2CommentStyle
+highlight default link modula2StmtTailComment modula2CommentStyle
+
+" technical debt markers
+highlight default link modula2ToDoHeader modula2TechDebtMarkerStyle
+highlight default link modula2ToDoTail modula2TechDebtMarkerStyle
+highlight default link modula2TechDebtPragma modula2TechDebtMarkerStyle
+
+" disabled code
+highlight default link modula2DisabledCode modula2DisabledCodeStyle
+
+" illegal symbols
+highlight default link modula2IllegalChar Error
+highlight default link modula2IllegalIdent Error
+
+
+let b:current_syntax = "modula2"
+
+" vim: ts=4
+
+" END OF FILE