diff --git a/gintro/gimpl.nim b/gintro/gimpl.nim
index 9871bb0..6859370 100644
--- a/gintro/gimpl.nim
+++ b/gintro/gimpl.nim
@@ -1,8 +1,11 @@
+const RecSep = "!" # Record separator for entries in gisup.nim, also defined in gen.nim
+
+# caution: $$ due to string interpolation
 let ct4nt = [
   "int32|int",
   "uint32|int",
   "gboolean|toBool",
-  "cstring|$"]
+  "cstring|$$"]
 
 proc ct5nt(s: string): string =
   for i in ct4nt:
@@ -10,10 +13,10 @@ proc ct5nt(s: string): string =
       return i[s.len + 1 .. ^1]
 
 proc findSignal(name, obj: NimNode): string =
-  let str = ($name).replace("-", "_") & "|"
+  let str = ($name).replace("-", "_") & RecSep
   for i in SCA:
     if i.startsWith(str):
-      let t = i.split("|", 2)[1]
+      let t = i.split(RecSep, 2)[1]
       var n = obj
       while true:
         if n.kind != nnkBracketExpr: break
@@ -50,7 +53,7 @@ proc $1$2 {.cdecl.} =
       r1s.add(", cast[$5](xdata)")
     r1s.add(")\n")
   else:
-    (sn, wid, num, ahl, all) = sci.split("|")
+    (sn, wid, num, ahl, all) = sci.split(RecSep)
     var resl: string
     if ahl.contains("): "):
       resl = all.rsplit("): ", 1)[1]
diff --git a/tests/gen.nim b/tests/gen.nim
index 9c9be25..177087c 100644
--- a/tests/gen.nim
+++ b/tests/gen.nim
@@ -1,5 +1,5 @@
 # High level gobject-introspection based GTK3 bindings for the Nim programming language
-# v 0.2 2017-SEP-18
+# v 0.2 2017-SEP-19
 # (c) S. Salewski 2017
 
 # https://wiki.gnome.org/Projects/GObjectIntrospection
@@ -49,6 +49,7 @@ template isFunctionInfo(info: untyped): untyped =
       (gBaseInfoGetType(cast[GIBaseInfo](info)) == GIInfoType.Function)
 
 const EM = "*"
+const RecSep = "!" # Record separator for entries in gisup.nim, also defined in gimpl.nim
 
 # hope that will work reliable
 proc cut(s: var StringStream; pos: int) =
@@ -846,16 +847,16 @@ proc writeInterface(info: GIInterfaceInfo) =
     if gCallableInfoGetNArgs(signalInfo) > 0 or gTypeInfoGetTag(zzzu) != GITypeTag.VOID:
       var memo = ""
       memo.add(gCallableInfoGetNArgs(signalInfo))
-      memo.add('|')
+      memo.add(RecSep)
       var plist, arglist: string
       var replist: TableRef[string, string]
       (plist, arglist, replist) = genP(signalInfo, true, info)
       memo.add(plist)
-      memo.add('|')
+      memo.add(RecSep)
       (plist, arglist, replist) = genP(signalInfo, false, info)
       memo.add(plist)
-      memo = memo.replace("\n  ", "")
-      supmod.writeLine("    \"" & ($gBaseInfoGetName(signalInfo)).replace("-", "_") & "|" & $gBaseInfoGetName(info) & "|" & memo & "\",")
+      memo = memo.replace("\n    ", "")
+      supmod.writeLine("    \"" & ($gBaseInfoGetName(signalInfo)).replace("-", "_") & RecSep & $gBaseInfoGetName(info) & RecSep & memo & "\",")
     if gCallableInfoGetNArgs(signalInfo) > 0:
       var plist, arglist: string
       var replist: TableRef[string, string]
@@ -1110,16 +1111,16 @@ proc writeObj(info: GIObjectInfo) =
     if gCallableInfoGetNArgs(signalInfo) > 0 or gTypeInfoGetTag(zzzu) != GITypeTag.VOID:
       var memo = ""
       memo.add(gCallableInfoGetNArgs(signalInfo))
-      memo.add('|')
+      memo.add(RecSep)
       var plist, arglist: string
       var replist: TableRef[string, string]
       (plist, arglist, replist) = genP(signalInfo, true, info)
       memo.add(plist)
-      memo.add('|')
+      memo.add(RecSep)
       (plist, arglist, replist) = genP(signalInfo, false, info)
       memo.add(plist)
-      memo = memo.replace("\n  ", "")
-      supmod.writeLine("    \"" & ($gBaseInfoGetName(signalInfo)).replace("-", "_") & "|" & $gBaseInfoGetName(info) & "|" & memo & "\",")
+      memo = memo.replace("\n    ", "")
+      supmod.writeLine("    \"" & ($gBaseInfoGetName(signalInfo)).replace("-", "_") & RecSep & $gBaseInfoGetName(info) & RecSep & memo & "\",")
     if gCallableInfoGetNArgs(signalInfo) > 0:
       var plist, arglist: string
       var replist: TableRef[string, string]