--- a/runtime/syntax/vim.vim
+++ b/runtime/syntax/vim.vim
@@ -29,16 +29,12 @@ syn cluster vimCommentGroup	contains=vim
 " regular vim commands {{{2
 " GEN_SYN_VIM: vimCommand normal, START_STR='syn keyword vimCommand contained', END_STR=''
 syn keyword vimCommand contained abc[lear] abo[veleft] abs[tract] al[l] ar[gs] arga[dd] argd[elete] argdo argded[upe] arge[dit] argg[lobal] argl[ocal] argu[ment] as[cii] b[uffer] bN[ext] ba[ll] bad[d] balt bd[elete] bel[owright] bf[irst] bl[ast] bm[odified] bn[ext] bo[tright] bp[revious] br[ewind] brea[k] breaka[dd] breakd[el] breakl[ist] bro[wse] buffers bufd[o] bun[load] bw[ipeout] c[hange] cN[ext] cNf[ile] cabc[lear] cabo[ve] cad[dbuffer] cadde[xpr] caddf[ile] caf[ter] cal[l] cat[ch] cb[uffer] cbe[fore] cbel[ow] cbo[ttom] cc ccl[ose] cd cdo ce[nter] cex[pr] cf[ile] cfd[o] cfir[st] cg[etfile] cgetb[uffer] cgete[xpr] chd[ir] changes che[ckpath] checkt[ime] chi[story] cl[ist] cla[st] class clo[se] cle[arjumps] cn[ext] cnew[er] cnf[ile] co[py] col[der] colo[rscheme]
-syn keyword vimCommand contained com[mand] comc[lear] comp[iler] con[tinue] conf[irm] cons[t] cope[n] cp[revious] cpf[ile] cq[uit] cr[ewind] cs[cope] cst[ag] cw[indow] d[elete] delm[arks] deb[ug] debugg[reedy] def defc[ompile] defe[r] delc[ommand] delf[unction] di[splay] dif[fupdate] diffg[et] diffo[ff] diffp[atch] diffpu[t] diffs[plit] difft[his] dig[raphs] disa[ssemble] dj[ump] dli[st] dr[op] ds[earch] dsp[lit] e[dit] ea[rlier] echoe[rr] echom[sg] echoc[onsole] echon echow[indow] el[se] elsei[f] em[enu] en[dif] endin[terface] endc[lass] endd[ef] ende[num] endf[unction] endfo[r] endt[ry] endw[hile] ene[w] enu[m] ev[al] ex exi[t] exp[ort] exu[sage] f[ile] files filet[ype] filt[er] fin[d] fina[l] finall[y] fini[sh] fir[st] fix[del] fo[ld] foldc[lose] foldd[oopen]
-syn keyword vimCommand contained folddoc[losed] foldo[pen] for fu[nction] g[lobal] go[to] gr[ep] grepa[dd] gu[i] gv[im] h[elp] helpc[lose] helpf[ind] helpg[rep] helpt[ags] ha[rdcopy] hi[ghlight] hid[e] his[tory] ho[rizontal] iabc[lear] if ij[ump] il[ist] imp[ort] int[ro] inte[rface] is[earch] isp[lit] j[oin] ju[mps] k kee[pmarks] keepj[umps] keepp[atterns] keepa[lt] l[ist] lN[ext] lNf[ile] la[st] lab[ove] lan[guage] lad[dexpr] laddb[uffer] laddf[ile] laf[ter] lat[er] lb[uffer] lbe[fore] lbel[ow] lbo[ttom] lc[d] lch[dir] lcl[ose] lcs[cope] ld[o] le[ft] lefta[bove] let lex[pr] leg[acy] lf[ile] lfd[o] lfir[st] lg[etfile] lgetb[uffer] lgete[xpr] lgr[ep] lgrepa[dd] lh[elpgrep] lhi[story] ll lla[st] lli[st] lmak[e] lne[xt] lnew[er] lnf[ile] lo[adview] loadk[eymap] loc[kmarks]
-syn keyword vimCommand contained lockv[ar] lol[der] lop[en] lp[revious] lpf[ile] lr[ewind] lt[ag] lua luad[o] luaf[ile] lv[imgrep] lvimgrepa[dd] lw[indow] ls m[ove] ma[rk] mak[e] marks mat[ch] menut[ranslate] mes[sages] mk[exrc] mks[ession] mksp[ell] mkv[imrc] mkvie[w] mod[e] mz[scheme] mzf[ile] n[ext] nb[key] nbc[lose] nbs[tart] noa[utocmd] noh[lsearch] nos[wapfile] nu[mber] o[pen] ol[dfiles] on[ly] opt[ions] ow[nsyntax] p[rint] pa[ckadd] packl[oadall] pc[lose] pe[rl] perld[o] ped[it] po[p] popu[p] pp[op] pre[serve] prev[ious] pro[mptfind] promptr[epl] prof[ile] profd[el] ps[earch] pt[ag] ptN[ext] ptf[irst] ptj[ump] ptl[ast] ptn[ext] ptp[revious] ptr[ewind] pts[elect] pu[t] pub[lic] pw[d] py[thon] pyd[o] pyf[ile] py3 py3d[o] python3 py3f[ile] pyx pyxd[o] pythonx
-syn keyword vimCommand contained pyxf[ile] q[uit] quita[ll] qa[ll] r[ead] rec[over] red[o] redi[r] redr[aw] redraws[tatus] redrawt[abline] reg[isters] res[ize] ret[ab] retu[rn] rew[ind] ri[ght] rightb[elow] ru[ntime] rub[y] rubyd[o] rubyf[ile] rund[o] rv[iminfo] sN[ext] sa[rgument] sal[l] san[dbox] sav[eas] sb[uffer] sbN[ext] sba[ll] sbf[irst] sbl[ast] sbm[odified] sbn[ext] sbp[revious] sbr[ewind] sc[riptnames] scripte[ncoding] scriptv[ersion] scs[cope] setf[iletype] sf[ind] sfir[st] sh[ell] si[malt] sig[n] sil[ent] sl[eep] sla[st] sn[ext] so[urce] sor[t] sp[lit] spe[llgood] spelld[ump] spelli[nfo] spellr[epall] spellra[re] spellu[ndo] spellw[rong] spr[evious] sr[ewind] st[op] sta[g] star[tinsert] startg[replace] startr[eplace] stat[ic] stopi[nsert] stj[ump] sts[elect]
-syn keyword vimCommand contained sun[hide] sus[pend] sv[iew] sw[apname] synti[me] sync[bind] smi[le] t tN[ext] ta[g] tags tab tabc[lose] tabd[o] tabe[dit] tabf[ind] tabfir[st] tabm[ove] tabl[ast] tabn[ext] tabnew tabo[nly] tabp[revious] tabN[ext] tabr[ewind] tabs tc[d] tch[dir] tcl tcld[o] tclf[ile] te[aroff] ter[minal] tf[irst] th[row] thi[s] tj[ump] tl[ast] tm[enu] tn[ext] to[pleft] tp[revious] tr[ewind] try ts[elect] tu[nmenu] ty[pe] u[ndo] undoj[oin] undol[ist] unh[ide] unl[et] unlo[ckvar] uns[ilent] up[date] v[global] ve[rsion] verb[ose] vert[ical] vi[sual] vie[w] vim[grep] vimgrepa[dd] vim9[cmd] vim9s[cript] viu[sage] vne[w] vs[plit] w[rite] wN[ext] wa[ll] wh[ile] wi[nsize] winc[md] wind[o] winp[os] wn[ext] wp[revious] wq wqa[ll] wu[ndo] wv[iminfo] x[it]
-syn keyword vimCommand contained xa[ll] xr[estore] y[ank] z dl dell delel deletl deletel dp dep delp delep deletp deletep a i
-syn keyword vimCommand contained am[enu] an[oremenu] aun[menu] cme[nu] cnoreme[nu] cunme[nu] ime[nu] inoreme[nu] iunme[nu] me[nu] nme[nu] nnoreme[nu] noreme[nu] nunme[nu] ome[nu] onoreme[nu] ounme[nu] sme[nu] snoreme[nu] sunme[nu] tlm[enu] tln[oremenu] tlu[nmenu] unme[nu] vme[nu] vnoreme[nu] vunme[nu] xme[nu] xnoreme[nu] xunme[nu]
-syn keyword vimCommand contained cm[ap] cno[remap] im[ap] ino[remap] lm[ap] ln[oremap] nm[ap] nn[oremap] no[remap] om[ap] ono[remap] smap snor[emap] tma[p] tno[remap] vm[ap] vn[oremap] xm[ap] xn[oremap]
-syn keyword vimCommand contained cmapc[lear] imapc[lear] lmapc[lear] nmapc[lear] omapc[lear] smapc[lear] tmapc[lear] vmapc[lear] xmapc[lear]
-syn keyword vimCommand contained cu[nmap] iu[nmap] lu[nmap] nun[map] ou[nmap] sunm[ap] tunma[p] unm[ap] vu[nmap] xu[nmap]
+syn keyword vimCommand contained com[mand] comc[lear] comp[iler] con[tinue] conf[irm] cons[t] cope[n] cp[revious] cpf[ile] cq[uit] cr[ewind] cs[cope] cst[ag] cw[indow] d[elete] delm[arks] deb[ug] debugg[reedy] def defc[ompile] defe[r] delc[ommand] delf[unction] di[splay] dif[fupdate] diffg[et] diffo[ff] diffp[atch] diffpu[t] diffs[plit] difft[his] dig[raphs] disa[ssemble] dj[ump] dli[st] dr[op] ds[earch] dsp[lit] e[dit] ea[rlier] el[se] elsei[f] em[enu] en[dif] endin[terface] endc[lass] endd[ef] ende[num] endf[unction] endfo[r] endt[ry] endw[hile] ene[w] enu[m] ev[al] ex exi[t] exp[ort] exu[sage] f[ile] files filet[ype] filt[er] fin[d] fina[l] finall[y] fini[sh] fir[st] fix[del] fo[ld] foldc[lose] foldd[oopen] folddoc[losed] foldo[pen] for fu[nction] g[lobal]
+syn keyword vimCommand contained go[to] gr[ep] grepa[dd] gu[i] gv[im] h[elp] helpc[lose] helpf[ind] helpg[rep] helpt[ags] ha[rdcopy] hi[ghlight] hid[e] his[tory] ho[rizontal] iabc[lear] if ij[ump] il[ist] imp[ort] int[ro] inte[rface] is[earch] isp[lit] j[oin] ju[mps] k kee[pmarks] keepj[umps] keepp[atterns] keepa[lt] l[ist] lN[ext] lNf[ile] la[st] lab[ove] lan[guage] lad[dexpr] laddb[uffer] laddf[ile] laf[ter] lat[er] lb[uffer] lbe[fore] lbel[ow] lbo[ttom] lc[d] lch[dir] lcl[ose] lcs[cope] ld[o] le[ft] lefta[bove] let lex[pr] leg[acy] lf[ile] lfd[o] lfir[st] lg[etfile] lgetb[uffer] lgete[xpr] lgr[ep] lgrepa[dd] lh[elpgrep] lhi[story] ll lla[st] lli[st] lmak[e] lne[xt] lnew[er] lnf[ile] lo[adview] loadk[eymap] loc[kmarks] lockv[ar] lol[der] lop[en] lp[revious]
+syn keyword vimCommand contained lpf[ile] lr[ewind] lt[ag] lua luad[o] luaf[ile] lv[imgrep] lvimgrepa[dd] lw[indow] ls m[ove] ma[rk] mak[e] marks mat[ch] menut[ranslate] mes[sages] mk[exrc] mks[ession] mksp[ell] mkv[imrc] mkvie[w] mod[e] mz[scheme] mzf[ile] n[ext] nb[key] nbc[lose] nbs[tart] noa[utocmd] noh[lsearch] nos[wapfile] nu[mber] o[pen] ol[dfiles] on[ly] opt[ions] ow[nsyntax] p[rint] pa[ckadd] packl[oadall] pc[lose] pe[rl] perld[o] ped[it] po[p] popu[p] pp[op] pre[serve] prev[ious] pro[mptfind] promptr[epl] prof[ile] profd[el] ps[earch] pt[ag] ptN[ext] ptf[irst] ptj[ump] ptl[ast] ptn[ext] ptp[revious] ptr[ewind] pts[elect] pu[t] pub[lic] pw[d] py[thon] pyd[o] pyf[ile] py3 py3d[o] python3 py3f[ile] pyx pyxd[o] pythonx pyxf[ile] q[uit] quita[ll] qa[ll] r[ead]
+syn keyword vimCommand contained rec[over] red[o] redi[r] redr[aw] redraws[tatus] redrawt[abline] reg[isters] res[ize] ret[ab] retu[rn] rew[ind] ri[ght] rightb[elow] ru[ntime] rub[y] rubyd[o] rubyf[ile] rund[o] rv[iminfo] sN[ext] sa[rgument] sal[l] san[dbox] sav[eas] sb[uffer] sbN[ext] sba[ll] sbf[irst] sbl[ast] sbm[odified] sbn[ext] sbp[revious] sbr[ewind] sc[riptnames] scripte[ncoding] scriptv[ersion] scs[cope] setf[iletype] sf[ind] sfir[st] sh[ell] si[malt] sig[n] sil[ent] sl[eep] sla[st] sn[ext] so[urce] sor[t] sp[lit] spe[llgood] spelld[ump] spelli[nfo] spellr[epall] spellra[re] spellu[ndo] spellw[rong] spr[evious] sr[ewind] st[op] sta[g] star[tinsert] startg[replace] startr[eplace] stat[ic] stopi[nsert] stj[ump] sts[elect] sun[hide] sus[pend] sv[iew] sw[apname]
+syn keyword vimCommand contained synti[me] sync[bind] smi[le] t tN[ext] ta[g] tags tab tabc[lose] tabd[o] tabe[dit] tabf[ind] tabfir[st] tabm[ove] tabl[ast] tabn[ext] tabnew tabo[nly] tabp[revious] tabN[ext] tabr[ewind] tabs tc[d] tch[dir] tcl tcld[o] tclf[ile] te[aroff] ter[minal] tf[irst] th[row] thi[s] tj[ump] tl[ast] tm[enu] tn[ext] to[pleft] tp[revious] tr[ewind] try ts[elect] tu[nmenu] ty[pe] u[ndo] undoj[oin] undol[ist] unh[ide] unl[et] unlo[ckvar] uns[ilent] up[date] v[global] ve[rsion] verb[ose] vert[ical] vi[sual] vie[w] vim[grep] vimgrepa[dd] vim9[cmd] vim9s[cript] viu[sage] vne[w] vs[plit] w[rite] wN[ext] wa[ll] wh[ile] wi[nsize] winc[md] wind[o] winp[os] wn[ext] wp[revious] wq wqa[ll] wu[ndo] wv[iminfo] x[it] xa[ll] xr[estore] y[ank] z dl dell delel
+syn keyword vimCommand contained deletl deletel dp dep delp delep deletp deletep a i
 
 syn keyword vimCommand contained	2mat[ch] 3mat[ch]
 
@@ -218,6 +214,8 @@ syn match vimVar        	"\s\zs&t_k;"
 syn match vimFBVar      contained   "\<[bwglstav]:\h[a-zA-Z0-9#_]*\>"
 syn keyword vimCommand  contained	in
 
+syn cluster vimExprList contains=vimEnvvar,vimFunc,vimFuncVar,vimNumber,vimOper,vimOperParen,vimLetRegister,vimString,vimVar
+
 " Insertions And Appends: insert append {{{2
 "   (buftype != nofile test avoids having append, change, insert show up in the command window)
 " =======================
@@ -387,11 +385,11 @@ syn match	vimEscape	contained	"\\\o\{1,3
 syn match	vimEscape	contained	"\\<" contains=vimNotation
 syn match	vimEscape	contained	"\\<\*[^>]*>\=>"
 
-syn region	vimString start=+$'+ end=+'+ skip=+''+ oneline contains=vimStringInterpolationBrace,vimStringInterpolationExpr
-syn region	vimString start=+$"+ end=+"+ oneline contains=@vimStringGroup,vimStringInterpolationBrace,vimStringInterpolationExpr
-syn region	vimStringInterpolationExpr matchgroup=vimSep start=+{+ end=+}+ oneline contains=vimFunc,vimFuncVar,vimOper,vimOperParen,vimNotation,vimNumber,vimString,vimVar
-syn match	vimStringInterpolationBrace "{{"
-syn match	vimStringInterpolationBrace "}}"
+syn region	vimString	oneline start=+$'+ skip=+''+ end=+'+ contains=vimStringInterpolationBrace,vimStringInterpolationExpr
+syn region	vimString	oneline start=+$"+ end=+"+ contains=@vimStringGroup,vimStringInterpolationBrace,vimStringInterpolationExpr
+syn region	vimStringInterpolationExpr  oneline contained matchgroup=vimSep start=+{+ end=+}+ contains=@vimExprList
+syn match	vimStringInterpolationBrace contained "{{"
+syn match	vimStringInterpolationBrace contained "}}"
 
 " Substitutions: {{{2
 " =============
@@ -486,13 +484,17 @@ syn match	vimAutoCmdMod	"\(++\)\=\(once\
 
 " Echo And Execute: -- prefer strings! {{{2
 " ================
-syn region	vimEcho	oneline excludenl matchgroup=vimCommand start="\<ec\%[ho]\>" skip="\(\\\\\)*\\|" end="$\||" contains=vimFunc,vimFuncVar,vimString,vimVar
-syn region	vimExecute	oneline excludenl matchgroup=vimCommand start="\<exe\%[cute]\>" skip="\(\\\\\)*\\|" end="$\||\|<[cC][rR]>" contains=vimFuncVar,vimIsCommand,vimOper,vimNotation,vimOperParen,vimString,vimVar
-syn match	vimEchoHL	"echohl\="	skipwhite nextgroup=vimGroup,vimHLGroup,vimEchoHLNone
+" GEN_SYN_VIM: vimCommand echo, START_STR='syn keyword vimEcho', END_STR='skipwhite nextgroup=vimEchoExpr'
+syn keyword vimEcho ec[ho] echoe[rr] echom[sg] echoc[onsole] echon echow[indow] skipwhite nextgroup=vimEchoExpr
+syn region	vimEchoExpr 	contained	start="[^[:space:]|]" skip=+\\\\\|\\|\|\n\s*\\\|\n\s*"\\ + matchgroup=vimCmdSep end="|" end="$" contains=@vimContinue,@vimExprList
+
+syn match	vimEchoHL	"\<echohl\=\>"	skipwhite nextgroup=vimGroup,vimHLGroup,vimEchoHLNone
 syn case ignore
 syn keyword	vimEchoHLNone	none
 syn case match
 
+syn region	vimExecute	oneline excludenl matchgroup=vimCommand start="\<exe\%[cute]\>" skip="\(\\\\\)*\\|" end="$\||\|<[cC][rR]>" contains=vimFuncVar,vimIsCommand,vimOper,vimNotation,vimOperParen,vimString,vimVar
+
 " Maps: {{{2
 " ====
 syn match	vimMap		"\<map\>\ze\s*(\@!" 	    skipwhite nextgroup=vimMapMod,vimMapLhs
@@ -997,6 +999,7 @@ if !exists("skip_vim_syntax_inits")
  hi def link vimContinue	Special
  hi def link vimContinueComment	vimComment
  hi def link vimCtrlChar	SpecialChar
+ hi def link vimEcho	vimCommand
  hi def link vimEchoHLNone	vimGroup
  hi def link vimEchoHL	vimCommand
  hi def link vimElseIfErr	Error