Merge remote-tracking branch 'upstream/master' into mix_20240309HEADrahm

33 files changed, 2461 insertions, 978 deletions

diff --git a/runtime/syntax/apache.vim b/runtime/syntax/apache.vim
index e73045e4c8..65317fd36a 100644
--- a/runtime/syntax/apache.vim
+++ b/runtime/syntax/apache.vim
@@ -3,8 +3,8 @@
 " Maintainer: David Necas (Yeti) <yeti@physics.muni.cz>
 " License: This file can be redistribued and/or modified under the same terms
 "		as Vim itself.
-" Last Change: 2022 Apr 25
-" Notes: Last synced with apache-2.2.3, version 1.x is no longer supported
+" Last Change: 2024 Nov 24
+" Notes: Last synced with apache-2.4.62, version 1.x is no longer supported
 " TODO: see particular FIXME's scattered through the file
 "		make it really linewise?
 "		+ add `display' where appropriate
@@ -14,6 +14,7 @@ if exists("b:current_syntax")
 	finish
 endif
 
+syn iskeyword @,48-57,_,192-255,-
 syn case ignore
 
 " Base constructs
@@ -45,9 +46,9 @@ syn keyword apacheMethodOption GET POST PUT DELETE CONNECT OPTIONS TRACE PATCH P
 " Added as suggested by Mikko Koivunalho
 syn keyword apacheMethodOption BASELINE-CONTROL CHECKIN CHECKOUT LABEL MERGE MKACTIVITY MKWORKSPACE REPORT UNCHECKOUT UPDATE VERSION-CONTROL contained
 syn case ignore
-syn match apacheSection "<\/\=\(Directory\|DirectoryMatch\|Files\|FilesMatch\|IfModule\|IfDefine\|Location\|LocationMatch\|VirtualHost\)[^>]*>" contains=apacheAnything
+syn match apacheSection "<\/\=\(Directory\|Files\|If\|Else\|Location\|VirtualHost\)[^>]*>" contains=apacheAnything
 syn match apacheSection "<\/\=\(RequireAll\|RequireAny\|RequireNone\)>" contains=apacheAnything
-syn match apacheLimitSection "<\/\=\(Limit\|LimitExcept\)[^>]*>" contains=apacheLimitSectionKeyword,apacheMethodOption,apacheError
+syn match apacheLimitSection "<\/\=Limit[^>]*>" contains=apacheLimitSectionKeyword,apacheMethodOption,apacheError
 syn keyword apacheLimitSectionKeyword Limit LimitExcept contained
 syn match apacheAuthType "AuthType\s.*$" contains=apacheAuthTypeValue
 syn keyword apacheAuthTypeValue Basic Digest
@@ -68,7 +69,7 @@ syn keyword apacheDeclaration AuthAuthoritative AuthGroupFile AuthUserFile
 syn keyword apacheDeclaration AuthBasicAuthoritative AuthBasicProvider
 syn keyword apacheDeclaration AuthDigestAlgorithm AuthDigestDomain AuthDigestNcCheck AuthDigestNonceFormat AuthDigestNonceLifetime AuthDigestProvider AuthDigestQop AuthDigestShmemSize
 syn keyword apacheOption none auth auth-int MD5 MD5-sess
-syn match apacheSection "<\/\=\(<AuthnProviderAlias\)[^>]*>" contains=apacheAnything
+syn match apacheSection "<\/\=Auth[ntz]ProviderAlias[^>]*>" contains=apacheAnything
 syn keyword apacheDeclaration Anonymous Anonymous_Authoritative Anonymous_LogEmail Anonymous_MustGiveEmail Anonymous_NoUserID Anonymous_VerifyEmail
 syn keyword apacheDeclaration AuthDBDUserPWQuery AuthDBDUserRealmQuery
 syn keyword apacheDeclaration AuthDBMGroupFile AuthDBMAuthoritative
@@ -155,7 +156,7 @@ syn keyword apacheDeclaration PerlCleanupHandler PerlChildInitHandler PerlChildE
 syn keyword apacheDeclaration PerlRestartHandler PerlDispatchHandler
 syn keyword apacheDeclaration PerlFreshRestart PerlSendHeader
 syn keyword apacheDeclaration php_value php_flag php_admin_value php_admin_flag
-syn match apacheSection "<\/\=\(Proxy\|ProxyMatch\)[^>]*>" contains=apacheAnything
+syn match apacheSection "<\/\=\(Macro\|MDomain\|Proxy\)[^>]*>" contains=apacheAnything
 syn keyword apacheDeclaration AllowCONNECT NoProxy ProxyBadHeader ProxyBlock ProxyDomain ProxyErrorOverride ProxyIOBufferSize ProxyMaxForwards ProxyPass ProxyPassMatch ProxyPassReverse ProxyPassReverseCookieDomain ProxyPassReverseCookiePath ProxyPreserveHost ProxyReceiveBufferSize ProxyRemote ProxyRemoteMatch ProxyRequests ProxyTimeout ProxyVia
 syn keyword apacheDeclaration RewriteBase RewriteCond RewriteEngine RewriteLock RewriteLog RewriteLogLevel RewriteMap RewriteOptions RewriteRule
 syn keyword apacheOption inherit
@@ -173,8 +174,8 @@ syn keyword apacheDeclaration SuexecUserGroup
 syn keyword apacheDeclaration UserDir
 syn keyword apacheDeclaration CookieDomain CookieExpires CookieName CookieStyle CookieTracking
 syn keyword apacheOption Netscape Cookie Cookie2 RFC2109 RFC2965
-syn match apacheSection "<\/\=\(<IfVersion\)[^>]*>" contains=apacheAnything
 syn keyword apacheDeclaration VirtualDocumentRoot VirtualDocumentRootIP VirtualScriptAlias VirtualScriptAliasIP
+syn keyword apacheDeclaration AcceptErrorsNonFatal AsyncFilter AsyncRequestWorkerFactor AuthBasicFake AuthBasicUseDigestAlgorithm AuthBearerAuthoritative AuthBearerProvider AuthBearerProxy AuthDBMType AuthDBMUserFile AuthFormAuthoritative AuthFormBody AuthFormDisableNoStore AuthFormFakeBasicAuth AuthFormLocation AuthFormLoginRequiredLocation AuthFormLoginSuccessLocation AuthFormLogoutLocation AuthFormMethod AuthFormMimetype AuthFormPassword AuthFormProvider AuthFormSitePassphrase AuthFormSize AuthFormUsername AuthLDAPAuthorizePrefix AuthLDAPBindAuthoritative AuthLDAPCompareAsUser AuthLDAPInitialBindAsUser AuthLDAPInitialBindPattern AuthLDAPMaxSubGroupDepth AuthLDAPRemoteUserAttribute AuthLDAPSearchAsUser AuthLDAPSubGroupAttribute AuthLDAPSubGroupClass AuthLDAPURL AuthMerging AuthnCacheContext AuthnCacheEnable AuthnCacheProvideFor AuthnCacheSOCache AuthnCacheTimeout AuthnzFcgiCheckAuthnProvider AuthnzFcgiDefineProvider AuthtJwtClaim AuthtJwtDriver AuthtJwtSign AuthtJwtVerify AuthzDBDLoginToReferer AuthzDBDQuery AuthzDBDRedirectQuery AuthzSendForbiddenOnFailure BalancerGrowth BalancerInherit BalancerMember BalancerPersist BrotliAlterETag BrotliCompressionMaxInputBlock BrotliCompressionQuality BrotliCompressionWindow BrotliFilterNote BufferSize CacheDetailHeader CacheHeader CacheIgnoreQueryString CacheIgnoreURLSessionIdentifiers CacheKeyBaseURL CacheLock CacheLockMaxAge CacheLockPath CacheMinExpire CacheQuickHandler CacheReadSize CacheReadTime CacheSocache CacheSocacheMaxSize CacheSocacheMaxTime CacheSocacheMinTime CacheSocacheReadSize CacheSocacheReadTime CacheStaleOnError CacheStoreExpired CGIDScriptTimeout CGIPassAuth CGIScriptTimeout CGIVar CheckBasenameMatch ChrootDir CookieHTTPOnly CookieSameSite CookieSecure CryptoCipher CryptoDriver CryptoIV CryptoKey CryptoSize CTAuditStorage CTLogClient CTLogConfigDB CTMaxSCTAge CTProxyAwareness CTSCTStorage CTServerHelloSCTLimit CTStaticLogConfig CTStaticSCTs DBDInitSQL DefaultRuntimeDir DefaultStateDir DeflateAlterETag DeflateInflateLimitRequestBody DeflateInflateRatioBurst DeflateInflateRatioLimit DirectoryCheckHandler DTracePrivileges FallbackResource Files FilesMatch FirehoseConnectionInput FirehoseConnectionOutput FirehoseProxyConnectionInput FirehoseProxyConnectionOutput FirehoseRequestInput FirehoseRequestOutput FlushMaxPipelined FlushMaxThreshold GlobalLog GprofDir H2CopyFiles H2Direct H2EarlyHint H2EarlyHints H2MaxDataFrameLen H2MaxSessionStreams H2MaxWorkerIdleSeconds H2MaxWorkers H2MinWorkers H2ModernTLSOnly H2OutputBuffering H2Padding H2ProxyRequests H2Push H2PushDiarySize H2PushPriority H2PushResource H2SerializeHeaders H2StreamMaxMemSize H2StreamTimeout H2TLSCoolDownSecs H2TLSWarmUpSize H2Upgrade H2WebSockets H2WindowSize HeartbeatAddress HeartbeatListen HeartbeatMaxServers HeartbeatStorage HeartbeatStorage HostnameLookups HttpProtocolOptions IndexForbiddenReturn404 IndexHeadInsert InputSed ISAPIFakeAsync KeptBodySize LDAPConnectionPoolTTL LDAPLibraryDebug LDAPReferralHopLimit LDAPReferrals LDAPRetries LDAPRetryDelay LDAPTimeout Location LocationMatch LogIOTrackTTFB LogIOTrackTTFU LogMessage LuaAuthzProvider LuaCodeCache LuaHookAccessChecker LuaHookAuthChecker LuaHookCheckUserID LuaHookFixups LuaHookInsertFilter LuaHookLog LuaHookMapToStorage LuaHookPreTranslate LuaHookTranslateName LuaHookTypeChecker LuaInherit LuaInputFilter LuaMapHandler LuaOutputFilter LuaPackageCPath LuaPackagePath LuaQuickHandler LuaRoot LuaScope MacroIgnoreBadNesting MacroIgnoreEmptyArgs MaxConnectionsPerChild MaxRangeOverlaps MaxRangeReversals MaxRanges MaxRequestWorkers MDActivationDelay MDBaseServer MDCAChallenges MDCertificateAgreement MDCertificateAuthority MDCertificateCheck MDCertificateFile MDCertificateKeyFile MDCertificateMonitor MDCertificateProtocol MDCertificateStatus MDChallengeDns01 MDChallengeDns01Version MDCheckInterval MDContactEmail MDDriveMode MDExternalAccountBinding MDHttpProxy MDMatchNames MDMember MDMembers MDMessageCmd MDMustStaple MDNotifyCmd MDomain MDPortMap MDPrivateKeys MDRenewMode MDRenewWindow MDRequireHttps MDRetryDelay MDRetryFailover MDServerStatus MDStapleOthers MDStapling MDStaplingKeepResponse MDStaplingRenewWindow MDStoreDir MDStoreLocks MDWarnWindow MemcacheConnTTL MergeSlashes MergeTrailers MimeOptions ModemStandard Mutex Order OutputSed PolicyConditional PolicyConditionalURL PolicyEnvironment PolicyFilter PolicyKeepalive PolicyKeepaliveURL PolicyLength PolicyLengthURL PolicyMaxage PolicyMaxageURL PolicyNocache PolicyNocacheURL PolicyType PolicyTypeURL PolicyValidation PolicyValidationURL PolicyVary PolicyVaryURL PolicyVersion PolicyVersionURL PrivilegesMode Protocol Protocols ProtocolsHonorOrder Proxy100Continue ProxyAddHeaders ProxyExpressDBMFile ProxyExpressDBMType ProxyExpressEnable ProxyFCGIBackendType ProxyFCGISetEnvIf ProxyFtpDirCharset ProxyFtpEscapeWildcards ProxyFtpListOnWildcard ProxyHCExpr ProxyHCTemplate ProxyHCTPsize ProxyHTMLBufSize ProxyHTMLCharsetOut ProxyHTMLDocType ProxyHTMLEnable ProxyHTMLEvents ProxyHTMLExtended ProxyHTMLFixups ProxyHTMLInterp ProxyHTMLLinks ProxyHTMLMeta ProxyHTMLStripComments ProxyHTMLURLMap ProxySCGIInternalRedirect ProxySCGISendfile ProxySet ProxySourceAddress ProxyStatus ProxyWebsocketAsync ProxyWebsocketAsyncDelay ProxyWebsocketFallbackToProxyHttp ProxyWebsocketIdleTimeout QualifyRedirectURL ReadBufferSize ReceiveBufferSize RedisConnPoolTTL RedisTimeout ReflectorHeader RegexDefaultOptions RegisterHttpMethod RemoteIPHeader RemoteIPInternalProxy RemoteIPInternalProxyList RemoteIPProxiesHeader RemoteIPProxyProtocol RemoteIPProxyProtocolExceptions RemoteIPTrustedProxy RemoteIPTrustedProxyList RemoveLanguage RequestReadTimeout SeeRequestTail Session SessionCookieMaxAge SessionCookieName SessionCookieName2 SessionCookieRemove SessionCryptoCipher SessionCryptoDriver SessionCryptoPassphrase SessionCryptoPassphraseFile SessionDBDCookieName SessionDBDCookieName2 SessionDBDCookieRemove SessionDBDDeleteLabel SessionDBDInsertLabel SessionDBDPerUser SessionDBDSelectLabel SessionDBDUpdateLabel SessionEnv SessionExclude SessionExpiryUpdateInterval SessionHeader SessionInclude SessionMaxAge SSIETag SSILastModified SSILegacyExprParser SSLCARevocationCheck SSLClientHelloVars SSLOCSPDefaultResponder SSLOCSPEnable SSLOCSPNoverify SSLOCSPOverrideResponder SSLOCSPProxyURL SSLOCSPResponderCertificateFile SSLOCSPResponderTimeout SSLOCSPResponseMaxAge SSLOCSPResponseTimeSkew SSLOCSPUseRequestNonce SSLOpenSSLConfCmd SSLPolicy SSLProxyCARevocationCheck SSLProxyCheckPeerName SSLSRPUnknownUserSeed SSLSRPVerifierFile SSLStaplingCache SSLStaplingErrorCacheTimeout SSLStaplingFakeTryLater SSLStaplingForceURL SSLStaplingResponderTimeout SSLStaplingResponseMaxAge SSLStaplingResponseTimeSkew SSLStaplingReturnResponderErrors SSLStaplingStandardCacheTimeout SSLUseStapling StrictHostCheck Substitute SubstituteInheritBefore SubstituteMaxLineLength Suexec UNCList UnDefine UndefMacro Use UseCanonicalPhysicalPort VHostCGIMode VHostCGIPrivs VHostGroup VHostPrivs VHostSecure VHostUser Warning WatchdogInterval xml2EncAlias xml2EncDefault xml2StartParse
 
 " Define the default highlighting
 
diff --git a/runtime/syntax/apkbuild.vim b/runtime/syntax/apkbuild.vim
new file mode 100644
index 0000000000..f969ff0e2e
--- /dev/null
+++ b/runtime/syntax/apkbuild.vim
@@ -0,0 +1,17 @@
+" Vim syntax file
+" Language:	apkbuild
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2024 Dec 22
+
+" quit when a syntax file was already loaded
+if exists("b:current_syntax")
+  finish
+endif
+
+" The actual syntax is in sh.vim and controlled by buffer-local variables.
+unlet! b:is_bash b:is_kornshell
+let b:is_sh = 1
+
+runtime! syntax/sh.vim
+
+let b:current_syntax = 'apkbuild'
diff --git a/runtime/syntax/asm.vim b/runtime/syntax/asm.vim
index 73f283a4a7..18f3de1c63 100644
--- a/runtime/syntax/asm.vim
+++ b/runtime/syntax/asm.vim
@@ -3,8 +3,8 @@
 " Maintainer:		Doug Kearns dougkearns@gmail.com
 " Previous Maintainers: Erik Wognsen <erik.wognsen@gmail.com>
 "			Kevin Dahlhausen <kdahlhaus@yahoo.com>
-" Contributors:		Ori Avtalion, Lakshay Garg
-" Last Change:		2020 Oct 31
+" Contributors:		Ori Avtalion, Lakshay Garg, Nir Lichtman
+" Last Change:		2025 Jan 26
 
 " quit when a syntax file was already loaded
 if exists("b:current_syntax")
@@ -32,6 +32,9 @@ syn match asmType "\.single"
 syn match asmType "\.space"
 syn match asmType "\.string"
 syn match asmType "\.word"
+syn match asmType "\.2byte"
+syn match asmType "\.4byte"
+syn match asmType "\.8byte"
 
 syn match asmIdentifier		"[a-z_][a-z0-9_]*"
 syn match asmLabel		"[a-z_][a-z0-9_]*:"he=e-1
diff --git a/runtime/syntax/c.vim b/runtime/syntax/c.vim
index 30db9438d0..68b6778c73 100644
--- a/runtime/syntax/c.vim
+++ b/runtime/syntax/c.vim
@@ -1,7 +1,7 @@
 " Vim syntax file
-" Language:	C
-" Maintainer:	The Vim Project <https://github.com/vim/vim>
-" Last Change:	2023 Aug 10
+" Language:		C
+" Maintainer:		The Vim Project <https://github.com/vim/vim>
+" Last Change:		2025 Jan 18
 " Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 
 " Quit when a (custom) syntax file was already loaded
@@ -111,6 +111,20 @@ if (s:ft ==# "c" && !exists("c_no_c11")) || (s:in_cpp_family && !exists("cpp_no_
   syn match	cSpecialCharacter display "[Uu]'\\x\x\+'"
 endif
 
+if (s:ft ==# "c" && !exists("c_no_c23")) || (s:in_cpp_family && !exists("cpp_no_cpp17"))
+  syn match	cCharacter	"u8'[^\\]'"
+  syn match	cCharacter	"u8'[^']*'" contains=cSpecial
+  if exists("c_gnu")
+    syn match	cSpecialError	"u8'\\[^'\"?\\abefnrtv]'"
+    syn match	cSpecialCharacter "u8'\\['\"?\\abefnrtv]'"
+  else
+    syn match	cSpecialError	"u8'\\[^'\"?\\abfnrtv]'"
+    syn match	cSpecialCharacter "u8'\\['\"?\\abfnrtv]'"
+  endif
+  syn match	cSpecialCharacter display "u8'\\\o\{1,3}'"
+  syn match	cSpecialCharacter display "u8'\\x\x\+'"
+endif
+
 "when wanted, highlight trailing white space
 if exists("c_space_errors")
   if !exists("c_no_trail_space_error")
@@ -191,12 +205,25 @@ syn case ignore
 syn match	cNumbers	display transparent "\<\d\|\.\d" contains=cNumber,cFloat,cOctalError,cOctal
 " Same, but without octal error (for comments)
 syn match	cNumbersCom	display contained transparent "\<\d\|\.\d" contains=cNumber,cFloat,cOctal
-syn match	cNumber		display contained "\d\+\%(u\=l\{0,2}\|ll\=u\)\>"
-"hex number
-syn match	cNumber		display contained "0x\x\+\%(u\=l\{0,2}\|ll\=u\)\>"
-" Flag the first zero of an octal number as something special
-syn match	cOctal		display contained "0\o\+\%(u\=l\{0,2}\|ll\=u\)\>" contains=cOctalZero
-syn match	cOctalZero	display contained "\<0"
+
+" cpp.vim handles these
+if !exists("c_no_c23") && !s:in_cpp_family
+  syn match	cNumber		display contained "\d\%('\=\d\+\)*\%(u\=l\{0,2}\|ll\=u\|u\=wb\|wbu\=\)\>"
+  "hex number
+  syn match	cNumber		display contained "0x\x\%('\=\x\+\)*\%(u\=l\{0,2}\|ll\=u\|u\=wb\|wbu\=\)\>"
+  " Flag the first zero of an octal number as something special
+  syn match	cOctal		display contained "0\o\%('\=\o\+\)*\%(u\=l\{0,2}\|ll\=u\|u\=wb\|wbu\=\)\>" contains=cOctalZero
+  "binary number
+  syn match	cNumber		display contained "0b[01]\%('\=[01]\+\)*\%(u\=l\{0,2}\|ll\=u\|u\=wb\|wbu\=\)\>"
+else
+  syn match	cNumber		display contained "\d\+\%(u\=l\{0,2}\|ll\=u\)\>"
+  "hex number
+  syn match	cNumber		display contained "0x\x\+\%(u\=l\{0,2}\|ll\=u\)\>"
+  " Flag the first zero of an octal number as something special
+  syn match	cOctal		display contained "0\o\+\%(u\=l\{0,2}\|ll\=u\)\>" contains=cOctalZero
+  syn match	cOctalZero	display contained "\<0"
+endif
+
 "floating point number, with dot, optional exponent
 syn match	cFloat		display contained "\d\+\.\d*\%(e[-+]\=\d\+\)\=[fl]\="
 "floating point number, starting with a dot, optional exponent
@@ -277,6 +304,13 @@ if !exists("c_no_c99") " ISO C99
   syn keyword	cType		intptr_t uintptr_t
   syn keyword	cType		intmax_t uintmax_t
 endif
+if !exists("c_no_c23") && !s:in_cpp_family
+  syn keyword	cOperator	typeof typeof_unqual
+  syn keyword	cType           _BitInt _Decimal32 _Decimal64 _Decimal128
+endif
+if (s:ft ==# "c" && !exists("c_no_c23")) || (s:in_cpp_family && !exists("cpp_no_cpp11"))
+  syn keyword	cType           nullptr_t
+endif
 
 syn keyword	cTypedef	typedef
 syn keyword	cStructure	struct union enum
@@ -284,6 +318,9 @@ syn keyword	cStorageClass	static register auto volatile extern const
 if !exists("c_no_c99") && !s:in_cpp_family
   syn keyword	cStorageClass	inline restrict
 endif
+if (s:ft ==# "c" && !exists("c_no_c23")) || (s:in_cpp_family && !exists("cpp_no_cpp11"))
+  syn keyword	cStorageClass	constexpr
+endif
 if !exists("c_no_c11")
   syn keyword	cStorageClass	_Alignas alignas
   syn keyword	cOperator	_Alignof alignof
@@ -312,10 +349,15 @@ if !exists("c_no_c11")
   syn keyword	cType		atomic_intmax_t atomic_uintmax_t
 endif
 
+if (s:ft ==# "c" && !exists("c_no_c23")) || (s:in_cpp_family && !exists("cpp_no_cpp20"))
+  syn keyword   cType		char8_t
+endif
+
 if !exists("c_no_ansi") || exists("c_ansi_constants") || exists("c_gnu")
   if exists("c_gnu")
     syn keyword cConstant __GNUC__ __FUNCTION__ __PRETTY_FUNCTION__ __func__
   endif
+  " TODO: __STDC_HOSTED__ is C99 and C++11
   syn keyword cConstant __LINE__ __FILE__ __DATE__ __TIME__ __STDC__ __STDC_VERSION__ __STDC_HOSTED__
   syn keyword cConstant CHAR_BIT MB_LEN_MAX MB_CUR_MAX
   syn keyword cConstant UCHAR_MAX UINT_MAX ULONG_MAX USHRT_MAX
@@ -324,6 +366,8 @@ if !exists("c_no_ansi") || exists("c_ansi_constants") || exists("c_gnu")
   syn keyword cConstant SCHAR_MIN SINT_MIN SLONG_MIN SSHRT_MIN
   syn keyword cConstant SCHAR_MAX SINT_MAX SLONG_MAX SSHRT_MAX
   if !exists("c_no_c99")
+    syn keyword cConstant __STDC_ISO_10646__ __STDC_IEC_559_COMPLEX__
+    syn keyword cConstant __STDC_MB_MIGHT_NEQ_WC__
     syn keyword cConstant __func__ __VA_ARGS__
     syn keyword cConstant LLONG_MIN LLONG_MAX ULLONG_MAX
     syn keyword cConstant INT8_MIN INT16_MIN INT32_MIN INT64_MIN
@@ -340,6 +384,26 @@ if !exists("c_no_ansi") || exists("c_ansi_constants") || exists("c_gnu")
     syn keyword cConstant PTRDIFF_MIN PTRDIFF_MAX SIG_ATOMIC_MIN SIG_ATOMIC_MAX
     syn keyword cConstant SIZE_MAX WCHAR_MIN WCHAR_MAX WINT_MIN WINT_MAX
   endif
+  if !exists("c_no_c11")
+    syn keyword cConstant __STDC_UTF_16__ __STDC_UTF_32__ __STDC_ANALYZABLE__
+    syn keyword cConstant __STDC_LIB_EXT1__ __STDC_NO_ATOMICS__
+    syn keyword cConstant __STDC_NO_COMPLEX__ __STDC_NO_THREADS__
+    syn keyword cConstant __STDC_NO_VLA__
+  endif
+  if !exists("c_no_c23")
+    syn keyword cConstant __STDC_UTF_16__ __STDC_UTF_32__
+    syn keyword cConstant __STDC_EMBED_NOT_FOUND__ __STDC_EMBED_FOUND__
+    syn keyword cConstant __STDC_EMBED_EMPTY__ __STDC_IEC_60559_BFP__
+    syn keyword cConstant __STDC_IEC_60559_DFP__ __STDC_IEC_60559_COMPLEX__
+    syn keyword cConstant __STDC_IEC_60559_TYPES__
+    syn keyword cConstant BITINT_MAXWIDTH
+  endif
+  if (s:ft ==# "c" && !exists("c_no_c23")) || (s:in_cpp_family && !exists("cpp_no_cpp20"))
+    syn keyword cConstant __VA_OPT__
+  endif
+  if (s:ft ==# "c" && !exists("c_no_c23")) || (s:in_cpp_family && !exists("cpp_no_cpp11"))
+    syn keyword cConstant nullptr
+  endif
   syn keyword cConstant FLT_RADIX FLT_ROUNDS FLT_DIG FLT_MANT_DIG FLT_EPSILON DBL_DIG DBL_MANT_DIG DBL_EPSILON
   syn keyword cConstant LDBL_DIG LDBL_MANT_DIG LDBL_EPSILON FLT_MIN FLT_MAX FLT_MIN_EXP FLT_MAX_EXP FLT_MIN_10_EXP FLT_MAX_10_EXP
   syn keyword cConstant DBL_MIN DBL_MAX DBL_MIN_EXP DBL_MAX_EXP DBL_MIN_10_EXP DBL_MAX_10_EXP LDBL_MIN LDBL_MAX LDBL_MIN_EXP LDBL_MAX_EXP
@@ -377,37 +441,77 @@ if !exists("c_no_ansi") || exists("c_ansi_constants") || exists("c_gnu")
 endif
 if !exists("c_no_c99") " ISO C99
   syn keyword cConstant true false
+  syn keyword cConstant INFINITY NAN
+  " math.h
+  syn keyword cConstant HUGE_VAL HUGE_VALF HUGE_VALL
+  syn keyword cConstant FP_FAST_FMAF FP_FAST_FMA FP_FAST_FMAL
+  syn keyword cConstant FP_ILOGB0 FP_ILOGBNAN
+  syn keyword cConstant math_errhandling MATH_ERRNO MATH_ERREXCEPT
+  syn keyword cConstant FP_NORMAL FP_SUBNORMAL FP_ZERO FP_INFINITE FP_NAN
 endif
 
 " Accept %: for # (C99)
-syn region	cPreCondit	start="^\s*\zs\%(%:\|#\)\s*\%(if\|ifdef\|ifndef\|elif\)\>" skip="\\$" end="$" keepend contains=cComment,cCommentL,cCppString,cCharacter,cCppParen,cParenError,cNumbers,cCommentError,cSpaceError
+syn cluster	cPreProcGroup	contains=cPreCondit,cIncluded,cInclude,cDefine,cErrInParen,cErrInBracket,cUserLabel,cSpecial,cOctalZero,cCppOutWrapper,cCppInWrapper,@cCppOutInGroup,cFormat,cNumber,cFloat,cOctal,cOctalError,cNumbersCom,cString,cCommentSkip,cCommentString,cComment2String,@cCommentGroup,cCommentStartError,cParen,cBracket,cMulti,cBadBlock
+if !exists("c_no_c23")
+  syn region	cPreCondit	start="^\s*\zs\%(%:\|#\)\s*\%(el\)\=\%(if\|ifdef\|ifndef\)\>" skip="\\$" end="$" keepend contains=cComment,cCommentL,cCppString,cCharacter,cCppParen,cParenError,cNumbers,cCommentError,cSpaceError
+else
+  syn region	cPreCondit	start="^\s*\zs\%(%:\|#\)\s*\%(if\|ifdef\|ifndef\|elif\)\>"    skip="\\$" end="$" keepend contains=cComment,cCommentL,cCppString,cCharacter,cCppParen,cParenError,cNumbers,cCommentError,cSpaceError
+endif
 syn match	cPreConditMatch	display "^\s*\zs\%(%:\|#\)\s*\%(else\|endif\)\>"
 if !exists("c_no_if0")
   syn cluster	cCppOutInGroup	contains=cCppInIf,cCppInElse,cCppInElse2,cCppOutIf,cCppOutIf2,cCppOutElse,cCppInSkip,cCppOutSkip
   syn region	cCppOutWrapper	start="^\s*\zs\%(%:\|#\)\s*if\s\+0\+\s*\%($\|//\|/\*\|&\)" end=".\@=\|$" contains=cCppOutIf,cCppOutElse,@NoSpell fold
   syn region	cCppOutIf	contained start="0\+" matchgroup=cCppOutWrapper end="^\s*\%(%:\|#\)\s*endif\>" contains=cCppOutIf2,cCppOutElse
   if !exists("c_no_if0_fold")
-    syn region	cCppOutIf2	contained matchgroup=cCppOutWrapper start="0\+" end="^\s*\%(%:\|#\)\s*\%(else\>\|elif\s\+\%(0\+\s*\%($\|//\|/\*\|&\)\)\@!\|endif\>\)"me=s-1 contains=cSpaceError,cCppOutSkip,@Spell fold
+    if !exists("c_no_c23")
+      syn region	cCppOutIf2	contained matchgroup=cCppOutWrapper start="0\+" end="^\s*\%(%:\|#\)\s*\%(else\>\|el\%(if\|ifdef\|ifndef\)\s\+\%(0\+\s*\%($\|//\|/\*\|&\)\)\@!\|endif\>\)"me=s-1 contains=cSpaceError,cCppOutSkip,@Spell fold
+    else
+      syn region	cCppOutIf2	contained matchgroup=cCppOutWrapper start="0\+" end="^\s*\%(%:\|#\)\s*\%(else\>\|elif\s\+\%(0\+\s*\%($\|//\|/\*\|&\)\)\@!\|endif\>\)"me=s-1 contains=cSpaceError,cCppOutSkip,@Spell fold
+    endif
+  else
+    if !exists("c_no_c23")
+      syn region	cCppOutIf2	contained matchgroup=cCppOutWrapper start="0\+" end="^\s*\%(%:\|#\)\s*\%(else\>\|el\%(if\|ifdef\|ifndef\)\s\+\%(0\+\s*\%($\|//\|/\*\|&\)\)\@!\|endif\>\)"me=s-1 contains=cSpaceError,cCppOutSkip,@Spell
+    else
+      syn region	cCppOutIf2	contained matchgroup=cCppOutWrapper start="0\+" end="^\s*\%(%:\|#\)\s*\%(else\>\|elif\s\+\%(0\+\s*\%($\|//\|/\*\|&\)\)\@!\|endif\>\)"me=s-1 contains=cSpaceError,cCppOutSkip,@Spell
+    endif
+  endif
+  if !exists("c_no_c23")
+    syn region	cCppOutElse	contained matchgroup=cCppOutWrapper start="^\s*\%(%:\|#\)\s*\%(else\|el\%(if\|ifdef\|ifndef\)\)" end="^\s*\%(%:\|#\)\s*endif\>"me=s-1 contains=TOP,cPreCondit
   else
-    syn region	cCppOutIf2	contained matchgroup=cCppOutWrapper start="0\+" end="^\s*\%(%:\|#\)\s*\%(else\>\|elif\s\+\%(0\+\s*\%($\|//\|/\*\|&\)\)\@!\|endif\>\)"me=s-1 contains=cSpaceError,cCppOutSkip,@Spell
+    syn region	cCppOutElse	contained matchgroup=cCppOutWrapper start="^\s*\%(%:\|#\)\s*\%(else\|elif\)" end="^\s*\%(%:\|#\)\s*endif\>"me=s-1 contains=TOP,cPreCondit
   endif
-  syn region	cCppOutElse	contained matchgroup=cCppOutWrapper start="^\s*\%(%:\|#\)\s*\%(else\|elif\)" end="^\s*\%(%:\|#\)\s*endif\>"me=s-1 contains=TOP,cPreCondit
   syn region	cCppInWrapper	start="^\s*\zs\%(%:\|#\)\s*if\s\+0*[1-9]\d*\s*\%($\|//\|/\*\||\)" end=".\@=\|$" contains=cCppInIf,cCppInElse fold
   syn region	cCppInIf	contained matchgroup=cCppInWrapper start="\d\+" end="^\s*\%(%:\|#\)\s*endif\>" contains=TOP,cPreCondit
   if !exists("c_no_if0_fold")
-    syn region	cCppInElse	contained start="^\s*\%(%:\|#\)\s*\%(else\>\|elif\s\+\%(0*[1-9]\d*\s*\%($\|//\|/\*\||\)\)\@!\)" end=".\@=\|$" containedin=cCppInIf contains=cCppInElse2 fold
+    if !exists("c_no_c23")
+      syn region	cCppInElse	contained start="^\s*\%(%:\|#\)\s*\%(else\>\|el\%(if\|ifdef\|ifndef\)\s\+\%(0*[1-9]\d*\s*\%($\|//\|/\*\||\)\)\@!\)" end=".\@=\|$" containedin=cCppInIf contains=cCppInElse2 fold
+    else
+      syn region	cCppInElse	contained start="^\s*\%(%:\|#\)\s*\%(else\>\|elif\s\+\%(0*[1-9]\d*\s*\%($\|//\|/\*\||\)\)\@!\)" end=".\@=\|$" containedin=cCppInIf contains=cCppInElse2 fold
+    endif
   else
-    syn region	cCppInElse	contained start="^\s*\%(%:\|#\)\s*\%(else\>\|elif\s\+\%(0*[1-9]\d*\s*\%($\|//\|/\*\||\)\)\@!\)" end=".\@=\|$" containedin=cCppInIf contains=cCppInElse2
+    if !exists("c_no_c23")
+      syn region	cCppInElse	contained start="^\s*\%(%:\|#\)\s*\%(else\>\|el\%(if\|ifdef\|ifndef\)\s\+\%(0*[1-9]\d*\s*\%($\|//\|/\*\||\)\)\@!\)" end=".\@=\|$" containedin=cCppInIf contains=cCppInElse2
+    else
+      syn region	cCppInElse	contained start="^\s*\%(%:\|#\)\s*\%(else\>\|elif\s\+\%(0*[1-9]\d*\s*\%($\|//\|/\*\||\)\)\@!\)" end=".\@=\|$" containedin=cCppInIf contains=cCppInElse2
+    endif
+  endif
+  if !exists("c_no_c23")
+    syn region	cCppInElse2	contained matchgroup=cCppInWrapper start="^\s*\%(%:\|#\)\s*\%(else\|el\%(if\|ifdef\|ifndef\)\)\%([^/]\|/[^/*]\)*" end="^\s*\%(%:\|#\)\s*endif\>"me=s-1 contains=cSpaceError,cCppOutSkip,@Spell
+  else
+    syn region	cCppInElse2	contained matchgroup=cCppInWrapper start="^\s*\%(%:\|#\)\s*\%(else\|elif\)\%([^/]\|/[^/*]\)*" end="^\s*\%(%:\|#\)\s*endif\>"me=s-1 contains=cSpaceError,cCppOutSkip,@Spell
   endif
-  syn region	cCppInElse2	contained matchgroup=cCppInWrapper start="^\s*\%(%:\|#\)\s*\%(else\|elif\)\%([^/]\|/[^/*]\)*" end="^\s*\%(%:\|#\)\s*endif\>"me=s-1 contains=cSpaceError,cCppOutSkip,@Spell
   syn region	cCppOutSkip	contained start="^\s*\%(%:\|#\)\s*\%(if\>\|ifdef\>\|ifndef\>\)" skip="\\$" end="^\s*\%(%:\|#\)\s*endif\>" contains=cSpaceError,cCppOutSkip
   syn region	cCppInSkip	contained matchgroup=cCppInWrapper start="^\s*\%(%:\|#\)\s*\%(if\s\+\%(\d\+\s*\%($\|//\|/\*\||\|&\)\)\@!\|ifdef\>\|ifndef\>\)" skip="\\$" end="^\s*\%(%:\|#\)\s*endif\>" containedin=cCppOutElse,cCppInIf,cCppInSkip contains=TOP,cPreProc
 endif
 syn region	cIncluded	display contained start=+"+ skip=+\\\\\|\\"+ end=+"+
 syn match	cIncluded	display contained "<[^>]*>"
 syn match	cInclude	display "^\s*\zs\%(%:\|#\)\s*include\>\s*["<]" contains=cIncluded
+if !exists("c_no_c23") && !s:in_cpp_family
+  syn region	cInclude	start="^\s*\zs\%(%:\|#\)\s*embed\>" skip="\\$" end="$" keepend contains=cEmbed,cComment,cCommentL,cCppString,cCharacter,cCppParen,cParenError,cNumbers,cCommentError,cSpaceError
+  syn match     cEmbed		contained "\%(%:\|#\)\s*embed\>" nextgroup=cIncluded skipwhite transparent
+  syn cluster	cPreProcGroup	add=cEmbed
+endif
 "syn match cLineSkip	"\\$"
-syn cluster	cPreProcGroup	contains=cPreCondit,cIncluded,cInclude,cDefine,cErrInParen,cErrInBracket,cUserLabel,cSpecial,cOctalZero,cCppOutWrapper,cCppInWrapper,@cCppOutInGroup,cFormat,cNumber,cFloat,cOctal,cOctalError,cNumbersCom,cString,cCommentSkip,cCommentString,cComment2String,@cCommentGroup,cCommentStartError,cParen,cBracket,cMulti,cBadBlock
 syn region	cDefine		start="^\s*\zs\%(%:\|#\)\s*\%(define\|undef\)\>" skip="\\$" end="$" keepend contains=ALLBUT,@cPreProcGroup,@Spell
 syn region	cPreProc	start="^\s*\zs\%(%:\|#\)\s*\%(pragma\>\|line\>\|warning\>\|warn\>\|error\>\)" skip="\\$" end="$" keepend contains=ALLBUT,@cPreProcGroup,@Spell
 
diff --git a/runtime/syntax/checkhealth.vim b/runtime/syntax/checkhealth.vim
index a4f6e016cb..14c80640ba 100644
--- a/runtime/syntax/checkhealth.vim
+++ b/runtime/syntax/checkhealth.vim
@@ -1,6 +1,5 @@
 " Vim syntax file
 " Language:     Nvim :checkhealth buffer
-" Last Change:  2022 Nov 10
 
 if exists("b:current_syntax")
   finish
diff --git a/runtime/syntax/chordpro.vim b/runtime/syntax/chordpro.vim
index 41a0a1e9d1..02c34b8466 100644
--- a/runtime/syntax/chordpro.vim
+++ b/runtime/syntax/chordpro.vim
@@ -2,6 +2,7 @@
 " Language:     ChordPro 6 (https://www.chordpro.org)
 " Maintainer:   Niels Bo Andersen <niels@niboan.dk>
 " Last Change:  2022-04-15
+" 2024 Dec 31:  add "keys" as syntax keyword (via: https://groups.google.com/g/vim_dev/c/vP4epus0euM/m/mNoDY6hsCQAJ)
 
 " Quit when a syntax file was already loaded
 if exists("b:current_syntax")
@@ -104,7 +105,7 @@ syn match chordproStandardMetadata /instrument\.description/ contained
 syn match chordproStandardMetadata /user\.name/ contained
 syn match chordproStandardMetadata /user\.fullname/ contained
 
-syn keyword chordproDefineKeyword contained frets fingers
+syn keyword chordproDefineKeyword contained frets fingers keys
 syn match chordproDefineKeyword /base-fret/ contained
 
 syn match chordproArgumentsNumber /\d\+/ contained
diff --git a/runtime/syntax/cmacro.vim b/runtime/syntax/cmacro.vim
new file mode 100644
index 0000000000..1d448f0d1b
--- /dev/null
+++ b/runtime/syntax/cmacro.vim
@@ -0,0 +1,77 @@
+" Vim syntax file
+" Language:	C macro for C preprocessor
+" Maintainer:	Wu, Zhenyu <wuzhenyu@ustc.edu>
+" Last Change:	2024 Dec 31
+" modified from syntax/c.vim
+
+" C compiler has a preprocessor: `cpp -P test.txt`
+" test.txt doesn't need to be a C file
+if exists("b:current_syntax")
+  finish
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+" Accept %: for # (C99)
+syn region	cmacroPreCondit	start="^\s*\zs\%(%:\|#\)\s*\%(if\|ifdef\|ifndef\|elif\)\>" skip="\\$" end="$" keepend contains=cmacroCppParen,cmacroNumbers
+syn match	cmacroPreConditMatch	display "^\s*\zs\%(%:\|#\)\s*\%(else\|endif\)\>"
+if !exists("c_no_if0")
+  syn cluster	cmacroCppOutInGroup	contains=cmacroCppInIf,cmacroCppInElse,cmacroCppInElse2,cmacroCppOutIf,cmacroCppOutIf2,cmacroCppOutElse,cmacroCppInSkip,cmacroCppOutSkip
+  syn region	cmacroCppOutWrapper	start="^\s*\zs\%(%:\|#\)\s*if\s\+0\+\s*\%($\|//\|/\*\|&\)" end=".\@=\|$" contains=cmacroCppOutIf,cmacroCppOutElse,@NoSpell fold
+  syn region	cmacroCppOutIf	contained start="0\+" matchgroup=cmacroCppOutWrapper end="^\s*\%(%:\|#\)\s*endif\>" contains=cmacroCppOutIf2,cmacroCppOutElse
+  if !exists("c_no_if0_fold")
+    syn region	cmacroCppOutIf2	contained matchgroup=cmacroCppOutWrapper start="0\+" end="^\s*\%(%:\|#\)\s*\%(else\>\|elif\s\+\%(0\+\s*\%($\|//\|/\*\|&\)\)\@!\|endif\>\)"me=s-1 contains=cmacroCppOutSkip,@Spell fold
+  else
+    syn region	cmacroCppOutIf2	contained matchgroup=cmacroCppOutWrapper start="0\+" end="^\s*\%(%:\|#\)\s*\%(else\>\|elif\s\+\%(0\+\s*\%($\|//\|/\*\|&\)\)\@!\|endif\>\)"me=s-1 contains=cmacroCppOutSkip,@Spell
+  endif
+  syn region	cmacroCppOutElse	contained matchgroup=cmacroCppOutWrapper start="^\s*\%(%:\|#\)\s*\%(else\|elif\)" end="^\s*\%(%:\|#\)\s*endif\>"me=s-1 contains=TOP,cmacroPreCondit
+  syn region	cmacroCppInWrapper	start="^\s*\zs\%(%:\|#\)\s*if\s\+0*[1-9]\d*\s*\%($\|//\|/\*\||\)" end=".\@=\|$" contains=cmacroCppInIf,cmacroCppInElse fold
+  syn region	cmacroCppInIf	contained matchgroup=cmacroCppInWrapper start="\d\+" end="^\s*\%(%:\|#\)\s*endif\>" contains=TOP,cmacroPreCondit
+  if !exists("c_no_if0_fold")
+    syn region	cmacroCppInElse	contained start="^\s*\%(%:\|#\)\s*\%(else\>\|elif\s\+\%(0*[1-9]\d*\s*\%($\|//\|/\*\||\)\)\@!\)" end=".\@=\|$" containedin=cmacroCppInIf contains=cmacroCppInElse2 fold
+  else
+    syn region	cmacroCppInElse	contained start="^\s*\%(%:\|#\)\s*\%(else\>\|elif\s\+\%(0*[1-9]\d*\s*\%($\|//\|/\*\||\)\)\@!\)" end=".\@=\|$" containedin=cmacroCppInIf contains=cmacroCppInElse2
+  endif
+  syn region	cmacroCppInElse2	contained matchgroup=cmacroCppInWrapper start="^\s*\%(%:\|#\)\s*\%(else\|elif\)\%([^/]\|/[^/*]\)*" end="^\s*\%(%:\|#\)\s*endif\>"me=s-1 contains=cmacroCppOutSkip,@Spell
+  syn region	cmacroCppOutSkip	contained start="^\s*\%(%:\|#\)\s*\%(if\>\|ifdef\>\|ifndef\>\)" skip="\\$" end="^\s*\%(%:\|#\)\s*endif\>" contains=cmacroCppOutSkip
+  syn region	cmacroCppInSkip	contained matchgroup=cmacroCppInWrapper start="^\s*\%(%:\|#\)\s*\%(if\s\+\%(\d\+\s*\%($\|//\|/\*\||\|&\)\)\@!\|ifdef\>\|ifndef\>\)" skip="\\$" end="^\s*\%(%:\|#\)\s*endif\>" containedin=cmacroCppOutElse,cmacroCppInIf,cmacroCppInSkip contains=TOP,cmacroPreProc
+endif
+syn region	cmacroIncluded	display contained start=+"+ skip=+\\\\\|\\"+ end=+"+
+syn match	cmacroIncluded	display contained "<[^>]*>"
+syn match	cmacroInclude	display "^\s*\zs\%(%:\|#\)\s*include\>\s*["<]" contains=cmacroIncluded
+"syn match cmacroLineSkip	"\\$"
+syn cluster	cmacroPreProcmacroGroup	contains=cmacroPreCondit,cmacroIncluded,cmacroInclude,cmacroDefine,cmacroCppOutWrapper,cmacroCppInWrapper,@cmacroCppOutInGroup,cmacroNumbersCom,@cmacroCommentGroup,cmacroParen,cmacroBracket,cmacroMulti,cmacroBadBlock
+syn region	cmacroDefine		start="^\s*\zs\%(%:\|#\)\s*\%(define\|undef\)\>" skip="\\$" end="$" keepend contains=ALLBUT,@cmacroPreProcmacroGroup,@Spell
+syn region	cmacroPreProc	start="^\s*\zs\%(%:\|#\)\s*\%(pragma\>\|line\>\|warning\>\|warn\>\|error\>\)" skip="\\$" end="$" keepend contains=ALLBUT,@cmacroPreProcmacroGroup,@Spell
+
+" be able to fold #pragma regions
+syn region	cmacroPragma		start="^\s*#pragma\s\+region\>" end="^\s*#pragma\s\+endregion\>" transparent keepend extend fold
+
+syn keyword cmacroTodo			contained TODO FIXME XXX NOTE
+syn region  cmacroComment		start='/\*' end='\*/' contains=cmacroTodo,@Spell
+syn match   cmacroCommentError "\*/"
+syn region  cmacroComment		start='//' end='$' contains=cmacroTodo,@Spell
+
+" Define the default highlighting.
+" Only used when an item doesn't have highlighting yet
+hi def link cmacroInclude		Include
+hi def link cmacroPreProc		PreProc
+hi def link cmacroDefine		Macro
+hi def link cmacroIncluded		cmacroString
+hi def link cmacroCppInWrapper	cmacroCppOutWrapper
+hi def link cmacroCppOutWrapper	cmacroPreCondit
+hi def link cmacroPreConditMatch	cmacroPreCondit
+hi def link cmacroPreCondit		PreCondit
+hi def link cmacroCppOutSkip		cmacroCppOutIf2
+hi def link cmacroCppInElse2		cmacroCppOutIf2
+hi def link cmacroCppOutIf2		cmacroCppOut
+hi def link cmacroCppOut		Comment
+hi def link cmacroTodo			Todo
+hi def link cmacroComment		Comment
+hi def link cmacroCommentError		Error
+
+let b:current_syntax = "cmacro"
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
diff --git a/runtime/syntax/dircolors.vim b/runtime/syntax/dircolors.vim
index 74a7068488..d968ed8fdd 100644
--- a/runtime/syntax/dircolors.vim
+++ b/runtime/synta