compiles now on current devel (1.3.5)

10 files changed, 527 insertions, 121 deletions

diff --git a/src/args.nim b/src/args.nim
index fd03ee0..490bd2b 100644
--- a/src/args.nim
+++ b/src/args.nim
@@ -104,9 +104,14 @@ proc splitArgs*(params: seq[string],
       let argsResult = toSeq(splitSingle(current[1 .. ^1], optionsWithParameter, next))
       let consumedNext = argsResult.map(a => a.consumedNext).foldl(a or b)
       let newNext = next.filter(n => not consumedNext)
-
-      return (lc[(x.key, x.value, ArgumentType.short) | (x <- argsResult), Argument],
-        newNext, stdinConsumed, false)
+      when NimVersion >= "1.2":
+        let lc = collect(newSeq):
+          for x in argsResult:
+            (x.key,x.value,ArgumentType.short)
+        return (lc, newNext, stdinConsumed, false)
+      else:
+        return (lc[(x.key, x.value, ArgumentType.short) | (x <- argsResult), Argument],
+          newNext, stdinConsumed, false)
     else:
       return (@[(current, none(string), ArgumentType.target)], next, stdinConsumed, false)
 
@@ -132,14 +137,20 @@ proc splitArgs*(params: seq[string],
       else:
         input
 
-  let cycle: ParseCycle = (params.map(some) & none(string))
+  let cycle: ParseCycle = (params.mapIt(some(it)) & none(string))
     .foldl(buildArgs(a, b), (newSeq[ParseArgument](), false, false))
 
   if cycle.stdinConsumed:
     discard close(0)
     discard open("/dev/tty", O_RDONLY)
 
-  lc[x | (y <- cycle.args, x <- y.arg), Argument]
+  when NimVersion >= "1.2":
+    collect(newSeq):
+      for y in cycle.args:
+        for x in y.arg:
+          x
+  else:
+    lc[x | (y <- cycle.args, x <- y.arg), Argument]
 
 proc isShort*(arg: Argument): bool = arg.atype == ArgumentType.short
 proc isLong*(arg: Argument): bool = arg.atype == ArgumentType.long
@@ -168,8 +179,13 @@ iterator items*(op: OptionPair): OptionKey =
 proc filter*(args: seq[Argument], removeMatches: bool, keepTargets: bool,
   pairs: varargs[OptionPair]): seq[Argument] =
   let pairsSeq = @pairs
-  let argsSet = lc[x | (y <- pairsSeq, x <- y), OptionKey].toHashSet
-
+  when NimVersion >= "1.2":
+    let argsSet = collect(initHashSet):
+      for y in pairsSeq:
+        for x in y:
+          {x}
+  else:
+    let argsSet = lc[x | (y <- pairsSeq, x <- y), OptionKey].toHashSet
   args.filter(arg => (arg.isShort and (removeMatches xor (arg.key, false) in argsSet)) or
     (arg.isLong and (removeMatches xor (arg.key, true) in argsSet)) or
     (arg.isTarget and keepTargets))
diff --git a/src/aur.nim b/src/aur.nim
index 399183c..a8be70b 100644
--- a/src/aur.nim
+++ b/src/aur.nim
@@ -70,9 +70,22 @@ proc getRpcPackageInfos*(pkgs: seq[string], repo: string, useTimeout: bool):
               .foldl(a & "&arg[]=" & b)
             performString(url, useTimeout)))
 
-        let table = lc[(x.name, x) | (z <- responses, y <- parseJson(z)["results"],
-          x <- parseRpcPackageInfo(y, repo)), (string, RpcPackageInfo)].toTable
-        (lc[x | (p <- pkgs, x <- table.opt(p)), RpcPackageInfo], none(string))
+        when NimVersion >= "1.2":
+          let table = collect(initTable):
+            for z in responses:
+              for y in parseJson(z)["results"]:
+                for x in parseRpcPackageInfo(y,repo):
+                  {x.name:x}
+          block:
+            let tmp = collect(newSeq):
+              for p in pkgs:
+                for x in table.opt(p):
+                  x
+            (tmp,none(string))
+        else:
+          let table = lc[(x.name, x) | (z <- responses, y <- parseJson(z)["results"],
+            x <- parseRpcPackageInfo(y, repo)), (string, RpcPackageInfo)].toTable
+          (lc[x | (p <- pkgs, x <- table.opt(p)), RpcPackageInfo], none(string))
       except CurlError:
         (@[], some(getCurrentException().msg))
       except JsonParsingError:
@@ -95,7 +108,14 @@ proc getAurPackageInfos*(pkgs: seq[string], repo: string, arch: string, useTimeo
             error: Option[string]
           ]
 
-        let deduplicated = lc[x.base | (x <- rpcInfos), string].deduplicate
+        when NimVersion >= "1.2":
+          let deduplicated = block:
+            let tmp = collect(newSeq):
+              for x in rpcInfos:
+                x.base
+            tmp.deduplicate
+        else:
+          let deduplicated = lc[x.base | (x <- rpcInfos), string].deduplicate
 
         proc obtainAndParse(base: string, index: int): ParseResult =
           let (srcInfo, operror) = obtainPkgBaseSrcInfo(base, useTimeout)
@@ -108,11 +128,27 @@ proc getAurPackageInfos*(pkgs: seq[string], repo: string, arch: string, useTimeo
             (pkgInfos, none(string))
 
         let parsed = deduplicated.foldl(a & obtainAndParse(b, a.len), newSeq[ParseResult]())
-        let infos = lc[x | (y <- parsed, x <- y.infos), PackageInfo]
-        let errors = lc[x | (y <- parsed, x <- y.error), string]
+        when NimVersion >= "1.2":
+          let infos = collect(newSeq):
+            for y in parsed:
+              for x in y.infos:
+                x
+          let errors = collect(newSeq):
+            for y in parsed:
+              for x in y.error:
+                x
+        else:
+          let infos = lc[x | (y <- parsed, x <- y.infos), PackageInfo]
+          let errors = lc[x | (y <- parsed, x <- y.error), string]
 
         let table = infos.map(i => (i.rpc.name, i)).toTable
-        let pkgInfos = lc[x | (p <- pkgs, x <- table.opt(p)), PackageInfo]
+        when NimVersion >= "1.2":
+          let pkgInfos = collect(newSeq):
+            for p in pkgs:
+              for x in table.opt(p):
+                x
+        else:
+          let pkgInfos = lc[x | (p <- pkgs, x <- table.opt(p)), PackageInfo]
 
         let names = rpcInfos.map(i => i.name).toHashSet
         let additionalPkgInfos = infos.filter(i => not (i.rpc.name in names))
@@ -132,7 +168,13 @@ proc findAurPackages*(query: seq[string], repo: string, useTimeout: bool):
 
           let response = performString(url, useTimeout)
           let results = parseJson(response)["results"]
-          let rpcInfos = lc[x | (y <- results, x <- parseRpcPackageInfo(y, repo)), RpcPackageInfo]
+          when NimVersion >= "1.2":
+            let rpcInfos = collect(newSeq):
+              for y in results:
+                for x in parseRpcPackageInfo(y,repo):
+                  x
+          else:
+            let rpcInfos = lc[x | (y <- results, x <- parseRpcPackageInfo(y, repo)), RpcPackageInfo]
 
           let filteredRpcInfos = if query.len > 1: (block:
               let queryLow = query[1 .. ^1].map(q => q.toLowerAscii)
diff --git a/src/common.nim b/src/common.nim
index 8db3a79..58d4d08 100644
--- a/src/common.nim
+++ b/src/common.nim
@@ -153,8 +153,17 @@ proc findSyncTargets*(handle: ptr AlpmHandle, dbs: seq[ptr AlpmDatabase],
         return @[]
     else:
       if allowGroups and target.reference.constraint.isNone:
-        let groupRepo = lc[d | (d <- dbs, g <- d.groups,
-          $g.name == target.reference.name), ptr AlpmDatabase].optFirst
+        when NimVersion >= "1.2":
+          let groupRepo = block:
+            let tmp = collect(newSeq):
+              for d in dbs:
+                for g in d.groups:
+                  if $g.name == target.reference.name:
+                    d
+            tmp.optFirst
+        else:
+          let groupRepo = lc[d | (d <- dbs, g <- d.groups,
+            $g.name == target.reference.name), ptr AlpmDatabase].optFirst
         if groupRepo.isSome:
           return @[($groupRepo.unsafeGet.name, none(SyncFoundPackageInfo))]
 
@@ -240,18 +249,36 @@ proc queryUnrequired*(handle: ptr AlpmHandle, withOptional: bool, withoutOptiona
 
     (installed, explicit.toHashSet + assumeExplicit, dependsTable, alternatives)
 
-  let providedBy = lc[(y, x.key) | (x <- alternatives.namedPairs, y <- x.value),
-    tuple[reference: PackageReference, name: string]]
+  when NimVersion >= "1.2":
+    let providedBy = collect(newSeq):
+      for x in alternatives.namedPairs:
+        for y in x.value:
+          (reference:y,name:x.key)
+  else:
+    let providedBy = lc[(y, x.key) | (x <- alternatives.namedPairs, y <- x.value),
+      tuple[reference: PackageReference, name: string]]
 
   proc findRequired(withOptional: bool, results: HashSet[string],
     check: HashSet[string]): HashSet[string] =
     let full = results + check
 
-    let direct = lc[x.reference | (y <- dependsTable.namedPairs, y.key in check,
-      x <- y.value, withOptional or not x.optional), PackageReference]
-
-    let indirect = lc[x.name | (y <- direct, x <- providedBy,
-      y.isProvidedBy(x.reference, true)), string].toHashSet
+    when NimVersion >= "1.2":
+      let direct = collect(newSeq):
+        for y in dependsTable.namedPairs:
+          if y.key in check:
+            for x in y.value:
+              if withOptional or not x.optional:
+                x.reference
+      let indirect = collect(initHashSet):
+        for y in direct:
+          for x in providedBy:
+            if y.isProvidedBy(x.reference, true):
+              {x.name}
+    else:
+      let direct = lc[x.reference | (y <- dependsTable.namedPairs, y.key in check,
+        x <- y.value, withOptional or not x.optional), PackageReference]
+      let indirect = lc[x.name | (y <- direct, x <- providedBy,
+        y.isProvidedBy(x.reference, true)), string].toHashSet
 
     let checkNext = (direct.map(p => p.name).toHashSet + indirect) - full
     if checkNext.len > 0: findRequired(withOptional, full, checkNext) else: full
@@ -622,13 +649,29 @@ proc obtainBuildPkgInfosInternal(config: Config, bases: seq[LookupBaseGroup],
           (list[tuple[pkgInfos: seq[PackageInfo], path: Option[string]]](), 0))
 
         let pkgInfosWithPaths = pkgInfosWithPathsReversed.reversed
-        let pkgInfos = lc[x | (y <- pkgInfosWithPaths, x <- y.pkgInfos), PackageInfo]
-        let paths = lc[x | (y <- pkgInfosWithPaths, x <- y.path), string]
+        when NimVersion >= "1.2":
+          let pkgInfos = collect(newSeq):
+            for y in pkgInfosWithPaths:
+              for x in y.pkgInfos:
+                x
+          let paths = collect(newSeq):
+            for y in pkgInfosWithPaths:
+              for x in y.path:
+                x
+        else:
+          let pkgInfos = lc[x | (y <- pkgInfosWithPaths, x <- y.pkgInfos), PackageInfo]
+          let paths = lc[x | (y <- pkgInfosWithPaths, x <- y.path), string]
 
         let pkgInfosTable = pkgInfos.map(i => (i.rpc.name, i)).toTable
-
-        let foundPkgInfos = lc[x | (y <- pacmanTargetNames,
-          x <- pkgInfosTable.opt(y)), PackageInfo]
+        
+        when NimVersion >= "1.2":
+          let foundPkgInfos = collect(newSeq):
+            for y in pacmanTargetNames:
+              for x in pkgInfosTable.opt(y):
+                x
+        else:
+          let foundPkgInfos = lc[x | (y <- pacmanTargetNames,
+            x <- pkgInfosTable.opt(y)), PackageInfo]
         let errorMessages = pacmanTargetNames
           .filter(n => not pkgInfosTable.hasKey(n))
           .map(n => tr"$#: failed to get package info" % [n])
@@ -738,7 +781,13 @@ proc cloneAurReposWithPackageInfos*(config: Config, rpcInfos: seq[RpcPackageInfo
 
   let (fullPkgInfos, paths, errors) = cloneNext(0, nil, nil, nil)
   let pkgInfosTable = fullPkgInfos.map(i => (i.rpc.name, i)).toTable
-  let resultPkgInfos = lc[x | (y <- rpcInfos, x <- pkgInfosTable.opt(y.name)), PackageInfo]
+  when NimVersion >= "1.2":
+    let resultPkgInfos = collect(newSeq):
+      for y in rpcInfos:
+        for x in pkgInfosTable.opt(y.name):
+          x
+  else:
+    let resultPkgInfos = lc[x | (y <- rpcInfos, x <- pkgInfosTable.opt(y.name)), PackageInfo]
 
   let names = rpcInfos.map(i => i.name).toHashSet
   let additionalPkgInfos = fullPkgInfos.filter(i => not (i.rpc.name in names))
diff --git a/src/feature/syncinfo.nim b/src/feature/syncinfo.nim
index 4f758fe..9dd1331 100644
--- a/src/feature/syncinfo.nim
+++ b/src/feature/syncinfo.nim
@@ -131,7 +131,14 @@ proc handleSyncInfo*(args: seq[Argument], config: Config): int =
       let padding = pacmanInfoStrings.map(s => s.trp).computeMaxLength
       let pkgInfosTable = pkgInfos.map(i => (i.rpc.toPackageReference, i)).toTable
 
-      let codes = code & lc[handleTarget(config, padding, finalArgs, x,
-        x.rpcInfo.map(i => pkgInfosTable.opt(i.toPackageReference)).flatten) |
-        (x <- fullTargets), int]
+      when NimVersion >= "1.2":
+        let codes = block:
+          let tmp = collect(newSeq):
+            for x in fullTargets:
+              handleTarget(config, padding, finalArgs, x, x.rpcInfo.map(i => pkgInfosTable.opt(i.toPackageReference)).flatten)
+          code & tmp
+      else:
+        let codes = code & lc[handleTarget(config, padding, finalArgs, x,
+          x.rpcInfo.map(i => pkgInfosTable.opt(i.toPackageReference)).flatten) |
+          (x <- fullTargets), int]
       codes.filter(c => c != 0).optFirst.get(0)
diff --git a/src/feature/syncinstall.nim b/src/feature/syncinstall.nim
index 7aba043..36115cc 100644
--- a/src/feature/syncinstall.nim
+++ b/src/feature/syncinstall.nim
@@ -66,7 +66,14 @@ proc isVcs(name: string): bool =
 
 proc orderInstallation(ordered: seq[seq[seq[PackageInfo]]], grouped: seq[seq[PackageInfo]],
   satisfied: Table[PackageReference, SatisfyResult]): seq[seq[seq[PackageInfo]]] =
-  let orderedNamesSet = lc[c.rpc.name | (a <- ordered, b <- a, c <- b), string].toHashSet
+  when NimVersion >= "1.2":
+    let orderedNamesSet = collect(initHashSet):
+      for a in ordered:
+        for b in a:
+          for c in b:
+            {c.rpc.name}
+  else:
+    let orderedNamesSet = lc[c.rpc.name | (a <- ordered, b <- a, c <- b), string].toHashSet
 
   proc hasBuildDependency(pkgInfos: seq[PackageInfo]): bool =
     for pkgInfo in pkgInfos:
@@ -241,8 +248,18 @@ proc findDependencies(config: Config, handle: ptr AlpmHandle, dbs: seq[ptr AlpmD
     success.map(r => (r.reference, r.result.unsafeGet)) &
     aurSuccess.map(r => (r.reference, r.result.unsafeGet))).toTable
 
-  let newUnsatisfied = lc[x | (y <- aurSuccess, r <- y.result, i <- r.buildPkgInfo,
-    x <- i.allDepends), PackageReference].deduplicate
+  when NimVersion >= "1.2":
+    let newUnsatisfied = block:
+      let tmp = collect(newSeq):
+        for y in aurSuccess:
+          for r in y.result:
+            for i in r.buildPkgInfo:
+              for x in i.allDepends:
+                x
+      tmp.deduplicate
+  else:
+    let newUnsatisfied = lc[x | (y <- aurSuccess, r <- y.result, i <- r.buildPkgInfo,
+      x <- i.allDepends), PackageReference].deduplicate
 
   let newTotalAurFail = (totalAurFail & aurFail).deduplicate
   let newTotalUnsatisfied = (newUnsatisfied & newTotalAurFail).deduplicate
@@ -261,7 +278,15 @@ proc findDependencies(config: Config, handle: ptr AlpmHandle,
   (Table[PackageReference, SatisfyResult], seq[PackageReference], seq[string]) =
   let satisfied = pkgInfos.map(p => ((p.rpc.name, none(string), none(VersionConstraint)),
     (false, p.rpc.name, some(p)))).toTable
-  let unsatisfied = lc[x | (i <- pkgInfos, x <- i.allDepends), PackageReference].deduplicate
+  when NimVersion >= "1.2":
+    let unsatisfied = block:
+      let tmp = collect(newSeq):
+        for i in pkgInfos:
+          for x in i.allDepends:
+            x
+      tmp.deduplicate
+  else:
+    let unsatisfied = lc[x | (i <- pkgInfos, x <- i.allDepends), PackageReference].deduplicate
   findDependencies(config, handle, dbs, satisfied, unsatisfied, @[],
     additionalPkgInfos, @[], nodepsCount, assumeInstalled, printMode, noaur)
 
@@ -473,7 +498,13 @@ proc buildLoop(config: Config, pkgInfos: seq[PackageInfo], skipDeps: bool,
         else:
           resultByNames
 
-      let failedNames = lc[x.name | (x <- resultByIndices, x.pkgInfo.isNone), string]
+      when NimVersion >= "1.2":
+        let failedNames = collect(newSeq):
+          for x in resultByIndices:
+            if x.pkgInfo.isNone:
+              x.name
+      else:
+        let failedNames = lc[x.name | (x <- resultByIndices, x.pkgInfo.isNone), string]
 
       if failedNames.len > 0:
         for name in failedNames:
@@ -563,11 +594,24 @@ proc installGroupFromSources(config: Config, commonArgs: seq[Argument],
     let arch = if pkgInfo.archs.len > 0: config.common.arch else: "any"
     config.tmpRootInitial & "/" & pkgInfo.rpc.name & "-" & pkgInfo.rpc.version & "-" & arch & ext
 
-  let allFiles = lc[(r.name, formatArchiveFile(r.pkgInfo, br.ext)) |
-    (br <- buildResults, r <- br.replacePkgInfos), tuple[name: Option[string], file: string]]
+  when NimVersion >= "1.2":
+    let allFiles = collect(newSeq):
+      for br in buildResults:
+        for r in br.replacePkgInfos:
+          (name:r.name, file:formatArchiveFile(r.pkgInfo, br.ext))
+  else:
+    let allFiles = lc[(r.name, formatArchiveFile(r.pkgInfo, br.ext)) |
+      (br <- buildResults, r <- br.replacePkgInfos), tuple[name: Option[string], file: string]]
   let filesTable = allFiles.filter(f => f.name.isSome).map(f => (f.name.unsafeGet, f.file)).toTable
-  let install = lc[(i.rpc.name, x) | (g <- basePackages, i <- g, x <- filesTable.opt(i.rpc.name)),
-    tuple[name: string, file: string]]
+  when NimVersion >= "1.2":
+    let install = collect(newSeq):
+      for g in basePackages:
+        for i in g:
+          for x in filesTable.opt(i.rpc.name):
+            (name:i.rpc.name,file:x)
+  else:
+    let install = lc[(i.rpc.name, x) | (g <- basePackages, i <- g, x <- filesTable.opt(i.rpc.name)),
+      tuple[name: string, file: string]]
 
   proc handleTmpRoot(clear: bool) =
     let installFiles = install.map(p => p.file)
@@ -628,11 +672,24 @@ proc installGroupFromSources(config: Config, commonArgs: seq[Argument],
       let pacmanDatabaseParams = pacmanCmd & pacmanParams(config.color,
         commonArgs.keepOnlyOptions(commonOptions) & ("D", none(string), ArgumentType.short))
 
-      let installParams = sudoPrefix & (pkgLibDir & "/install") &
-        cacheDir & $cacheUser & $cacheGroup &
-        $pacmanUpgradeParams.len & pacmanUpgradeParams &
-        $pacmanDatabaseParams.len & pacmanDatabaseParams &
-        lc[x | (i <- installWithReason, x <- [i.name, i.file, i.mode]), string]
+      when NimVersion >= "1.2":
+        
+        let installParams = block:
+          let tmp = collect(newSeq):
+            for i in installWithReason:
+              for x in [i.name,i.file,i.mode]:
+                x
+          sudoPrefix & (pkgLibDir & "/install") &
+          cacheDir & $cacheUser & $cacheGroup &
+          $pacmanUpgradeParams.len & pacmanUpgradeParams &
+          $pacmanDatabaseParams.len & pacmanDatabaseParams &
+          tmp
+      else:
+        let installParams = sudoPrefix & (pkgLibDir & "/install") &
+          cacheDir & $cacheUser & $cacheGroup &
+          $pacmanUpgradeParams.len & pacmanUpgradeParams &
+          $pacmanDatabaseParams.len & pacmanDatabaseParams &
+          lc[x | (i <- installWithReason, x <- [i.name, i.file, i.mode]), string]
 
       let code = forkWait(() => execResult(installParams))
       if code != 0:
@@ -662,8 +719,15 @@ proc installGroupFromSources(config: Config, commonArgs: seq[Argument],
             run(gitCmd, "-C", bareRepoPath, "tag", tag)
 
         handleTmpRoot(true)
-        let installedAs = lc[(r.name.unsafeGet, r.pkgInfo.rpc.name) | (br <- buildResults,
-          r <- br.replacePkgInfos, r.name.isSome), (string, string)]
+        when NimVersion >= "1.2":
+          let installedAs = collect(newSeq):
+            for br in buildResults:
+              for r in br.replacePkgInfos:
+                if r.name.isSome:
+                  (r.name.unsafeGet, r.pkgInfo.rpc.name)
+        else:
+          let installedAs = lc[(r.name.unsafeGet, r.pkgInfo.rpc.name) | (br <- buildResults,
+            r <- br.replacePkgInfos, r.name.isSome), (string, string)]
         (installedAs, 0)
 
 proc deduplicatePkgInfos(pkgInfos: seq[PackageInfo],
@@ -695,12 +759,25 @@ proc resolveDependencies(config: Config, pkgInfos: seq[PackageInfo],
       newSeq[seq[seq[PackageInfo]]](), newSeq[string]())
   else:
     let buildAndAurNamesSet = pkgInfos.map(i => i.rpc.name).toHashSet
-    let fullPkgInfos = (pkgInfos & lc[i | (s <- satisfied.values,
-      i <- s.buildPkgInfo, not (i.rpc.name in buildAndAurNamesSet)), PackageInfo])
-      .deduplicatePkgInfos(config, false)
+    when NimVersion >= "1.2":
+      let fullPkgInfos = block:
+        let tmp = collect(newSeq):
+          for s in satisfied.values:
+            for i in s.buildPkgInfo:
+              if not (i.rpc.name in buildAndAurNamesSet):
+                i
+        (pkgInfos & tmp).deduplicatePkgInfos(config,false)
+      let additionalPacmanTargets = collect(newSeq):
+        for x in satisfied.values:
+          if not x.installed and x.buildPkgInfo.isNone:
+            x.name
+    else:
+      let fullPkgInfos = (pkgInfos & lc[i | (s <- satisfied.values,
+        i <- s.buildPkgInfo, not (i.rpc.name in buildAndAurNamesSet)), PackageInfo])
+        .deduplicatePkgInfos(config, false)
 
-    let additionalPacmanTargets = lc[x.name | (x <- satisfied.values,
-      not x.installed and x.buildPkgInfo.isNone), string]
+      let additionalPacmanTargets = lc[x.name | (x <- satisfied.values,
+        not x.installed and x.buildPkgInfo.isNone), string]
     let orderedPkgInfos = orderInstallation(fullPkgInfos, satisfied)
 
     (true, satisfied, additionalPacmanTargets, orderedPkgInfos, paths)
@@ -709,16 +786,31 @@ proc confirmViewAndImportKeys(config: Config, basePackages: seq[seq[seq[PackageI
   installed: seq[Installed], noconfirm: bool): int =
   if basePackages.len > 0: (block:
     let installedVersions = installed.map(i => (i.name, i.version)).toTable
-
-    printPackages(config.color, config.common.verbosePkgLists,
-      lc[(i.rpc.name, i.rpc.repo, installedVersions.opt(i.rpc.name), i.rpc.version) |
-        (g <- basePackages, b <- g, i <- b), PackageInstallFormat]
-        .sorted((a, b) => cmp(a.name, b.name)))
+    when NimVersion >= "1.2":
+      block:
+        let tmp = collect(newSeq):
+          for g in basePackages:
+            for b in g:
+              for i in b:
+                (i.rpc.name,i.rpc.repo,installedVersions.opt(i.rpc.name),i.rpc.version).PackageInstallFormat
+        printPackages(config.color, config.common.verbosePkgLists,
+          tmp.sorted((a,b) => cmp(a.name, b.name)))
+    else:
+      printPackages(config.color, config.common.verbosePkgLists,
+        lc[(i.rpc.name, i.rpc.repo, installedVersions.opt(i.rpc.name), i.rpc.version) |
+          (g <- basePackages, b <- g, i <- b), PackageInstallFormat]
+          .sorted((a, b) => cmp(a.name, b.name)))
     let input = printColonUserChoice(config.color,
       tr"Proceed with building?", ['y', 'n'], 'y', 'n', noconfirm, 'y')
 
     if input == 'y':
-      let flatBasePackages = lc[x | (a <- basePackages, x <- a), seq[PackageInfo]]
+      when NimVersion >= "1.2":
+        let flatBasePackages = collect(newSeq):
+          for a in basePackages:
+            for x in a:
+              x
+      else:
+        let flatBasePackages = lc[x | (a <- basePackages, x <- a), seq[PackageInfo]]
 
       proc checkNext(index: int, skipEdit: bool, skipKeys: bool): int =
         if index < flatBasePackages.len:
@@ -749,7 +841,15 @@ proc confirmViewAndImportKeys(config: Config, basePackages: seq[seq[seq[PackageI
           else:
             let resultPkgInfos = reloadPkgInfos(config,
               repoPath & "/" & pkgInfos[0].rpc.gitSubdir.get("."), pkgInfos)
-            let pgpKeys = lc[x | (p <- resultPkgInfos, x <- p.pgpKeys), string].deduplicate
+            when NimVersion >= "1.2":
+              let pgpKeys = block:
+                let tmp = collect(newSeq):
+                  for p in resultPkgInfos:
+                    for x in p.pgpKeys:
+                      x
+                tmp.deduplicate
+            else:
+              let pgpKeys = lc[x | (p <- resultPkgInfos, x <- p.pgpKeys), string].deduplicate
 
             proc keysLoop(index: int, skipKeys: bool): char =
               if index >= pgpKeys.len:
@@ -890,8 +990,14 @@ proc filterIgnoresAndConflicts(config: Config, pkgInfos: seq[PackageInfo],
   targetNamesSet: HashSet[string], installed: Table[string, Installed],
   printMode: bool, noconfirm: bool): (seq[PackageInfo], seq[PackageInfo]) =
   let acceptedPkgInfos = pkgInfos.filter(pkgInfo => (block:
-    let instGroups = lc[x | (i <- installed.opt(pkgInfo.rpc.name),
-      x <- i.groups), string]
+    when NimVersion >= "1.2":
+      let instGroups = collect(newSeq):
+        for i in installed.opt(pkgInfo.rpc.name):
+          for x in i.groups:
+            x
+    else:
+      let instGroups = lc[x | (i <- installed.opt(pkgInfo.rpc.name),
+        x <- i.groups), string]
 
     if config.ignored(pkgInfo.rpc.name, (instGroups & pkgInfo.groups).deduplicate):
       if pkgInfo.rpc.name in targetNamesSet:
@@ -908,10 +1014,25 @@ proc filterIgnoresAndConflicts(config: Config, pkgInfos: seq[PackageInfo],
       true))
 
   let nonConflicingPkgInfos = acceptedPkgInfos.foldl(block:
-    let conflictsWith = lc[p | (p <- a, p.rpc.name != b.rpc.name and
-      (lc[0 | (c <- b.conflicts, c.isProvidedBy(p.rpc.toPackageReference, true)), int].len > 0 or
-        lc[0 | (c <- p.conflicts, c.isProvidedBy(b.rpc.toPackageReference, true)), int].len > 0)),
-      PackageInfo]
+    when NimVersion >= "1.2":
+      let conflictsWith = collect(newSeq):
+        for p in a:
+          if (p.rpc.name != b.rpc.name and (block:collect(newSeq):
+                for c in b.conflicts:
+                  if c.isProvidedBy(p.rpc.toPackageReference, true):
+                    0
+              ).len>0 or (block:collect(newSeq):
+                for c in p.conflicts:
+                  if c.isProvidedBy(p.rpc.toPackageReference, true):
+                    0
+              ).len>0
+              ):
+            p
+    else:
+      let conflictsWith = lc[p | (p <- a, p.rpc.name != b.rpc.name and
+        (lc[0 | (c <- b.conflicts, c.isProvidedBy(p.rpc.toPackageReference, true)), int].len > 0 or
+          lc[0 | (c <- p.conflicts, c.isProvidedBy(b.rpc.toPackageReference, true)), int].len > 0)),
+        PackageInfo]
     if not printMode and conflictsWith.len > 0:
       for conflict in conflictsWith:
         printWarning(config.color,
@@ -1043,7 +1164,12 @@ proc obtainInstalledWithAur(config: Config): (seq[Installed], seq[string]) =
       ($package.name, $package.version, package.groupsSeq,
         package.reason == AlpmReason.explicit, foreign)
 
-    let installed = lc[createInstalled(p) | (p <- handle.local.packages), Installed]
+    when NimVersion >= "1.2":
+      let installed = collect(newSeq):
+        for p in handle.local.packages:
+          createInstalled(p)
+    else:
+      let installed = lc[createInstalled(p) | (p <- handle.local.packages), Installed]
     let checkAurUpgradeNames = installed
       .filter(i => i.foreign and (config.checkIgnored or not config.ignored(i.name, i.groups)))
       .map(i => i.name)
@@ -1076,7 +1202,13 @@ proc resolveBuildTargets(config: Config, syncTargets: seq[SyncPackageTarget],
   let installedTable = installed.map(i => (i.name, i)).toTable
   let rpcAurTargets = fullTargets.filter(f => f.isAurTargetFull(config.aurRepo))
 
-  let targetRpcInfos = lc[x | (t <- rpcAurTargets, x <- t.rpcInfo), RpcPackageInfo]
+  when NimVersion >= "1.2":
+    let targetRpcInfos = collect(newSeq):
+      for t in rpcAurTargets:
+        for x in t.rpcInfo:
+          x
+  else:
+    let targetRpcInfos = lc[x | (t <- rpcAurTargets, x <- t.rpcInfo), RpcPackageInfo]
   let targetRpcInfoNames = targetRpcInfos.map(i => i.name).toHashSet
   let rpcInfos = targetRpcInfos & upgradeRpcInfos.filter(i => not (i.name in targetRpcInfoNames))
 
@@ -1224,8 +1356,15 @@ proc handleInstall(args: seq[Argument], config: Config, syncTargets: seq[SyncPac
                           return true
                     return false
 
-                  lc[x.key | (x <- satisfied.namedPairs, not x.value.installed and
-                    x.value.buildPkgInfo.isNone and not x.key.checkSatisfied), PackageReference]
+                  when NimVersion >= "1.2":
+                    collect(newSeq):
+                      for x in satisfied.namedPairs:
+                        if not x.value.installed and x.value.buildPkgInfo.isNone and
+                            not x.key.checkSatisfied:
+                          x.key
+                  else:
+                    lc[x.key | (x <- satisfied.namedPairs, not x.value.installed and
+                      x.value.buildPkgInfo.isNone and not x.key.checkSatisfied), PackageReference]
               else:
                 @[]
 
diff --git a/src/feature/syncsource.nim b/src/feature/syncsource.nim
index c050e6a..f966085 100644
--- a/src/feature/syncsource.nim
+++ b/src/feature/syncsource.nim
@@ -129,10 +129,11 @@ proc cloneAndCopy(config: Config, quiet: bool, fullTargets: seq[FullPackageTarge
         a & (pkg.base, pkg.version, b.sync.target.destination.get(pkg.base), none(string), git),
     newSeq[BaseTarget]())
 
-  let (update, terminate) = if quiet:
-      (proc (a: int, b: int) {.closure.} = discard, proc () {.closure.} = discard)
-    else:
+  let (update, terminate) = if not quiet:
       printProgressShare(config.common.progressBar, tr"cloning repositories")
+    else:
+      (proc (i0: int, i1: int) {.sideEffect,closure.} = discard, proc () {.sideEffect,closure.} = discard)
+
 
   let (results, rerrors) = cloneRepositories(config, baseTargets, update)
   terminate()
diff --git a/src/format.nim b/src/format.nim
index 2ac39dc..3ed7b58 100644
--- a/src/format.nim
+++ b/src/format.nim
@@ -108,7 +108,13 @@ proc printPackageInfo*(minPadding: int, color: bool, lines: varargs[PackageLineF
     if values.len == 0:
       @[]
     elif forceBreak:
-      lc[x | (y <- values.map(s => strutils.strip(s).splitLines(lineSize)), x <- y), string]
+      when NimVersion > "1.2":
+        collect(newSeq):
+          for y in values.map(s => strutils.strip(s).splitLines(lineSize)):
+            for x in y:
+              x
+      else:
+        lc[x | (y <- values.map(s => strutils.strip(s).splitLines(lineSize)), x <- y), string]
     else:
       values.map(v => strutils.strip(v)).foldl(a & "  " & b).splitLines(lineSize)
 
@@ -299,7 +305,7 @@ proc printProgressFull*(bar: bool, title: string): ((string, float) -> void, ()
 
   if not bar or width <= 0:
     echo(title, "...")
-    (proc (a: string, c: float) {.closure.} = discard, proc {.closure.} = discard)
+    (proc (a: string, c: float) {.sideEffect,closure.} = discard, proc {.sideEffect,closure.} = discard)
   else:
     let infoLen = max(width * 6 / 10, 50).int
     let progressLen = width - infoLen
@@ -309,7 +315,7 @@ proc printProgressFull*(bar: bool, title: string): ((string, float) -> void, ()
     var lastProgress = 0f
     var averageSpeed = -1f
 
-    proc update(prefix: string, progress: float) {.closure.} =
+    proc update(prefix: string, progress: float) {.sideEffect,closure.} =
       let progressTrim = max(min(1, progress + 0.005), 0)
       let progressStr = $(progressTrim * 100).int & "%"
       let paddedProgressStr = ' '.repeat(5 - progressStr.len) & progressStr
@@ -347,7 +353,7 @@ proc printProgressFull*(bar: bool, title: string): ((string, float) -> void, ()
         ' ', timeLeft, indicator, paddedProgressStr, "\x1b[0K\r")
       stdout.flushFile()
 
-    proc terminate() {.closure.} =
+    proc terminate() {.sideEffect,closure.} =
       echo()
 
     update(" ", 0)
@@ -357,7 +363,7 @@ proc printProgressFull*(bar: bool, title: string): ((string, float) -> void, ()
 proc printProgressShare*(bar: bool, title: string): ((int, int) -> void, () -> void) =
   let (updateFull, terminate) = printProgressFull(bar, title)
 
-  proc update(current: int, total: int) {.closure.} =
+  proc update(current: int, total: int) {.sideEffect,closure.} =
     let prefix = if total > 0:
         "(" & ' '.repeat(($total).len - ($current).len) & $current & "/" &
           $total & ") "
diff --git a/src/main.nim b/src/main.nim
index 92e8887..af22bc0 100644
--- a/src/main.nim
+++ b/src/main.nim
@@ -11,8 +11,16 @@ import
   "feature/syncsource"
 
 proc execSudo*(args: seq[Argument]): int =
-  execResult(sudoPrefix & getAppFilename() &
-    lc[x | (y <- args, x <- y.collectArg), string])
+  when NimVersion >= "1.2":
+    execResult(sudoPrefix & getAppFilename() &
+    (block:collect(newSeq):
+      for y in args:
+        for x in y.collectArg:
+          x
+    ))
+  else:
+    execResult(sudoPrefix & getAppFilename() &
+      lc[x | (y <- args, x <- y.collectArg), string])
 
 proc passValidation(args: seq[Argument], config: Config,
   nonRootArgs: openArray[OptionPair], rootArgs: openArray[OptionPair],
diff --git a/src/package.nim b/src/package.nim
index 5b87184..5e42b0c 100644
--- a/src/package.nim
+++ b/src/package.nim
@@ -91,8 +91,15 @@ const
 
 static:
   # test only single match available
-  let osSet = lc[x | (r <- packageRepos, x <- r.os), string].toHashSet
-  let repoSet = lc[x | (r <- packageRepos, x <- r.repo), string].toHashSet
+  when NimVersion >= "1.2":
+    var osSet = initHashSet[string]()
+    var repoSet = initHashSet[string]()
+    for r in packageRepos:
+      osSet.incl(r.os)
+      repoSet.incl(r.repo)
+  else:
+    let osSet = lc[x | (r <- packageRepos, x <- r.os), string].toHashSet
+    let repoSet = lc[x | (r <- packageRepos, x <- r.repo), string].toHashSet
   for os in osSet:
     for repo in repoSet:
       let osValue = os
@@ -102,10 +109,20 @@ static:
           "only single matching repo available: " & os & ":" & repo)
 
   # test unique url <> bareName links
-  let bareNameToUrl = lc[(x, r.git.url) |
-    (r <- packageRepos, x <- r.git.bareName), (string, string)].toTable
-  let urlToBareName = lc[(r.git.url, x) |
-    (r <- packageRepos, x <- r.git.bareName), (string, string)].toTable
+  when NimVersion >= "1.2":
+    let bareNameToUrl = collect(initTable):
+      for r in packageRepos:
+        for x in r.git.bareName:
+          {x:r.git.url}
+    let urlToBareName = collect(initTable):
+      for r in packageRepos:
+        for x in r.git.bareName:
+          {r.git.url:x}
+  else:
+    let bareNameToUrl = lc[(x, r.git.url) |
+      (r <- packageRepos, x <- r.git.bareName), (string, string)].toTable
+    let urlToBareName = lc[(r.git.url, x) |
+      (r <- packageRepos, x <- r.git.bareName), (string, string)].toTable
 
   template testBareNamesAndUrls(m1: untyped, m2: untyped) =
     for x1, x2 in m1:
@@ -262,9 +279,15 @@ proc parseSrcInfoName(repo: string, name: string, baseIndex: int, baseCount: int
   rpcInfos: seq[RpcPackageInfo], baseSeq: ref seq[SrcInfoPair], nameSeq: ref seq[SrcInfoPair],
   arch: string, gitUrl: string, gitSubdir: Option[string]): Option[PackageInfo] =
   proc collectFromPairs(pairs: seq[SrcInfoPair], keyName: string): seq[string] =
-    lc[x.value | (x <- pairs, x.key == keyName), string]
+    when NimVersion >= "1.2":
+      collect(newSeq):
+        for x in pairs:
+          if x.key == keyName:
+            x.value
+    else:
+      lc[x.value | (x <- pairs, x.key == keyName), string]
 
-  proc collect(baseOnly: bool, keyName: string): seq[string] =
+  proc kcollect(baseOnly: bool, keyName: string): seq[string] =
     let res = if baseOnly: @[] else: collectFromPairs(nameSeq[], keyName)
     if res.len == 0:
       collectFromPairs(baseSeq[], keyName).filter(x => x.len > 0)
@@ -272,28 +295,56 @@ proc parseSrcInfoName(repo: string, name: string, baseIndex: int, baseCount: int
       res.filter(x => x.len > 0)
 
   proc collectArch(baseOnly: bool, keyName: string): seq[PackageReference] =
-    (collect(baseOnly, keyName) & collect(baseOnly, keyName & "_" & arch))
+    (kcollect(baseOnly, keyName) & kcollect(baseOnly, keyName & "_" & arch))
       .map(n => parsePackageReference(n, true))
       .filter(c => c.name.len > 0)
 
   proc filterReferences(references: seq[PackageReference],
     filterWith: seq[PackageReference]): seq[PackageReference] =
     references.filter(r => filterWith.filter(w => r.isProvidedBy(w, true)).len == 0)
+  
+  when NimVersion >= "1.2":
+#[  let base = block:
+      let tmp = newSeq[string]()
+      for x in baseSeq[]:
+        if x.key == "pkgbase":
+          tmp.add(x.value)
+      tmp.optLast
+]#
+    let base = block:
+      let tmp = collect(newSeq):
+        for x in baseSeq[]:
+          if x.key == "pkgbase":
+            x.value
+      tmp.optLast
+  else:
+    let base = lc[x.value | (x <- baseSeq[], x.key == "pkgbase"), string].optLast
+
+  let version = kcollect(true, "pkgver").optLast
+  let release = kcollect(true, "pkgrel").optLast
+  let epoch = kcollect(true, "epoch").optLast
+  when NimVersion >= "1.2":
+    #tmp = newSeq[string]()
+    #for v in version:
+      #for r in release:
+        #tmp.add(v & "-" & r)
+    #let versionFull = tmp.optLast.map(v => epoch.map(e => e & ":" & v).get(v))
+    let versionFull = block:
+      let tmp = collect(newSeq):
+        for v in version:
+          for r in release:
+            (v & "-" & r)
+      tmp.optLast.map(v => epoch.map(e => e & ":" & v).get(v))
+  else:
+    let versionFull = lc[(v & "-" & r) | (v <- version, r <- release), string].optLast
+      .map(v => epoch.map(e => e & ":" & v).get(v))
 
-  let base = lc[x.value | (x <- baseSeq[], x.key == "pkgbase"), string].optLast
-
-  let version = collect(true, "pkgver").optLast
-  let release = collect(true, "pkgrel").optLast
-  let epoch = collect(true, "epoch").optLast
-  let versionFull = lc[(v & "-" & r) | (v <- version, r <- release), string].optLast
-    .map(v => epoch.map(e => e & ":" & v).get(v))
-
-  let description = collect(false, "pkgdesc").optLast
-  let archs = collect(false, "arch").filter(a => a != "any")
-  let url = collect(false, "url").optLast
-  let licenses = collect(false, "license")
-  let groups = collect(false, "groups")
-  let pgpKeys = collect(true, "validpgpkeys")
+  let description = kcollect(false, "pkgdesc").optLast
+  let archs = kcollect(false, "arch").filter(a => a != "any")
+  let url = kcollect(false, "url").optLast
+  let licenses = kcollect(false, "license")
+  let groups = kcollect(false, "groups")
+  let pgpKeys = kcollect(true, "validpgpkeys")
 
   let baseDepends = collectArch(true, "depends")
   let depends = collectArch(false, "depends")
@@ -308,7 +359,20 @@ proc parseSrcInfoName(repo: string, name: string, baseIndex: int, baseCount: int
 
   let info = rpcInfos.filter(i => i.name == name).optLast
 
-  lc[((repo, b, name, v, description, info.map(i => i.maintainer).flatten,
+  when NimVersion >= "1.2":
+    block:
+      let tmp = collect(newSeq):
+        for b in base:
+          for v in versionFull:
+            ((repo, b, name, v, description, info.map(i => i.maintainer).flatten,
+            info.map(i => i.firstSubmitted).flatten, info.map(i => i.lastModified).flatten,
+            info.map(i => i.outOfDate).flatten, info.map(i => i.votes).get(0),
+            info.map(i => i.popularity).get(0), gitUrl, gitSubdir), baseIndex,  baseCount,
+            archs, url, licenses, groups, pgpKeys, depends, makeDepends, checkDepends,
+            optional, provides, conflicts, replaces)
+      tmp.optLast
+  else:
+    lc[((repo, b, name, v, description, info.map(i => i.maintainer).flatten,
     info.map(i => i.firstSubmitted).flatten, info.map(i => i.lastModified).flatten,
     info.map(i => i.outOfDate).flatten, info.map(i => i.votes).get(0),
     info.map(i => i.popularity).get(0), gitUrl, gitSubdir), baseIndex,  baseCount,
diff --git a/src/pacman.nim b/src/pacman.nim
index 857581f..d1fadb0 100644
--- a/src/pacman.nim
+++ b/src/pacman.nim
@@ -36,7 +36,13 @@ proc calculateOptionsWithParameter(opts: seq[CommandOption]): seq[OptionKey] {.c
     else:
       @[]
 
-  lc[x | (y <- opts, x <- commandToSeq(y)), OptionKey]
+  when NimVersion >= "1.2":
+    collect(newSeq):
+      for y in opts:
+        for x in commandToSeq(y):
+          x
+  else:
+    lc[x | (y <- opts, x <- commandToSeq(y)), OptionKey]
 
 proc o(long: string): CommandOption {.compileTime.} =
   ((none(string), long), false, false, {})
@@ -200,7 +206,13 @@ proc getOperation*(args: seq[Argument]): OperationType =
 proc filterOptions*(args: seq[Argument], removeMatches: bool, keepTargets: bool,
   includeOperations: bool, opts: varargs[seq[CommandOption]]): seq[Argument] =
   let optsSeq = @opts
-  let optsPairSeq = lc[x.pair | (y <- optsSeq, x <- y), OptionPair]
+  when NimVersion >= "1.2":
+    let optsPairSeq = collect(newSeq):
+      for y in optsSeq:
+        for x in y:
+          x.pair
+  else:
+    let optsPairSeq = lc[x.pair | (y <- optsSeq, x <- y), OptionPair]
 
   let work = if includeOperations:
       (optsPairSeq & operations.map(o => o.pair))
@@ -234,16 +246,45 @@ proc filterExtensions*(args: seq[Argument], removeMatches: bool, keepTargets: bo
   opts: varargs[seq[CommandOption]]): seq[Argument] =
   let optsSeq = @opts
   let optsFilter = if removeMatches:
-      lc[x | (y <- optsSeq, x <- y), CommandOption]
+      when NimVersion >= "1.2":
+        collect(newSeq):
+          for y in optsSeq:
+            for x in y:
+              x
+      else:
+        lc[x | (y <- optsSeq, x <- y), CommandOption]
     else: (block:
-      let pairs = lc[x.pair | (y <- optsSeq, x <- y), OptionPair].toHashSet
-      lc[x | (x <- allOptions, not (x.pair in pairs)), CommandOption])
-
-  let argsSeq = lc[x.pair | (x <- optsFilter, x.extension), OptionPair]
+      when NimVersion >= "1.2":
+        let pairs = collect(initHashSet):
+          for y in optsSeq:
+            for x in y:
+              {x.pair}
+        collect(newSeq):
+          for x in allOptions:
+            if not (x.pair in pairs):
+              x
+      else:
+        let pairs = lc[x.pair | (y <- optsSeq, x <- y), OptionPair].toHashSet
+        lc[x | (x <- allOptions, not (x.pair in pairs)), CommandOption]
+      )
+
+  when NimVersion >= "1.2":
+    let argsSeq = collect(newSeq):
+      for x in optsFilter:
+        if x.extension:
+          x.pair
+  else:
+    let argsSeq = lc[x.pair | (x <- optsFilter, x.extension), OptionPair]
   args.filter(removeMatches, keepTargets, argsSeq)
 
 proc obtainConflictsPairs(conflicts: seq[ConflictingOptions]): Table[string, seq[OptionPair]] =
-  let all = lc[x | (y <- conflicts, x <- y.left & y.right), string].deduplicate
+  when NimVersion >= "1.2":
+    let all = collect(newSeq):
+      for y in conflicts:
+        for x in (y.left & y.right):
+          x
+  else:
+    let all = lc[x | (y <- conflicts, x <- y.left & y.right), string].deduplicate
   all.map(c => (c, allOptions.filter(o => o.pair.long == c)
     .map(o => o.pair).deduplicate)).toTable
 
@@ -259,14 +300,30 @@ proc checkConflicts*(args: seq[Argument],
   let table = conflicts.obtainConflictsPairs
   template full(s: string): OptionPair = table[s][0]
 
-  lc[(c.left, w) | (c <- conflicts, args.check(c.left.full),
-    w <- c.right, args.check(w.full)), (string, string)].optFirst
+  when NimVersion >= "1.2":
+    block:
+      let tmp = collect(newSeq):
+        for c in conflicts:
+          if args.check(c.left.full):
+            for w in c.right:
+              if args.check(w.full):
+                (c.left,w)
+      tmp.optFirst
+  else:
+    lc[(c.left, w) | (c <- conflicts, args.check(c.left.full),
+      w <- c.right, args.check(w.full)), (string, string)].optFirst
 
 proc pacmanParams*(color: bool, args: varargs[Argument]): seq[string] =
   let colorStr = if color: "always" else: "never"
   let argsSeq = ("color", some(colorStr), ArgumentType.long) &
     @args.filter(arg => not arg.matchOption(%%%"color"))
-  lc[x | (y <- argsSeq, x <- y.collectArg), string]
+  when NimVersion >= "1.2":
+    collect(newSeq):
+      for y in argsSeq:
+        for x in y.collectArg:
+          x
+  else:
+    lc[x | (y <- argsSeq, x <- y.collectArg), string]
 
 proc pacmanExecInternal(root: bool, params: varargs[string]): int =
   let exec = if root: sudoPrefix & pacmanCmd & @params else: pacmanCmd & @params
@@ -283,7 +340,14 @@ proc pacmanRun*(root: bool, color: bool, args: varargs[Argument]): int =
 
 proc pacmanValidateAndThrow(args: varargs[tuple[arg: Argument, pass: bool]]): void =
   let argsSeq = @args
-  let collectedArgs = lc[x | (y <- argsSeq, y.pass, x <- y.arg.collectArg), string]
+  when NimVersion >= "1.2":
+    let collectedArgs = collect(newSeq):
+      for y in argsSeq:
+        if y.pass:
+          for x in y.arg.collectArg:
+            x
+  else:
+    let collectedArgs = lc[x | (y <- argsSeq, y.pass, x <- y.arg.collectArg), string]
   let code = forkWait(() => pacmanExecInternal(false, "-T" & collectedArgs))
   if code != 0:
     raise haltError(code)
@@ -346,10 +410,20 @@ proc obtainPacmanConfig*(args: seq[Argument]): PacmanConfig =
 
   let debug = args.check(%%%"debug")
   let progressBar = not args.check(%%%"noprogressbar")
-  let ignorePkgs = lc[x | (y <- getAll(%%%"ignore"),
-    x <- y.split(',')), string].toHashSet
-  let ignoreGroups = lc[x | (y <- getAll(%%%"ignoregroup"),
-    x <- y.split(',')), string].toHashSet
+  when NimVersion >= "1.2":
+    let ignorePkgs = collect(initHashSet):
+      for y in getAll(%%%"ignore"):
+        for x in y.split(','):
+          {x}
+    let ignoreGroups = collect(initHashSet):
+      for y in getAll(%%%"ignoregroup"):
+        for x in y.split(','):
+          {x}
+  else:
+    let ignorePkgs = lc[x | (y <- getAll(%%%"ignore"),
+      x <- y.split(',')), string].toHashSet
+    let ignoreGroups = lc[x | (y <- getAll(%%%"ignoregroup"),
+      x <- y.split(',')), string].toHashSet
 
   let hasKeyserver = forkWaitRedirect(() => (block:
     if dropPrivileges():