openarray/varargs split; breaks bootstrapping

tests/reject/tnocontains.nim

@@ -0,0 +1,11 @@
+discard """
+  file: "tnocontains.nim"
+  line: 10
+  errormsg: "type mismatch: got (string, string)"
+"""
+
+# shouldn't compile since it doesn't do what you think it does without
+# importing strutils:
+
+let x = "abc" in "abcdef"
+echo x

tests/run/tpegs.nim

@@ -161,7 +161,7 @@ template multipleOp(k: TPegKind, localOpt: expr) =
   if result.len == 1:
     result = result.sons[0]
 
-proc `/`*(a: openArray[TPeg]): TPeg {.
+proc `/`*(a: varargs[TPeg]): TPeg {.
   rtl, extern: "npegsOrderedChoice".} =
   ## constructs an ordered choice with the PEGs in `a`
   multipleOp(pkOrderedChoice, addChoice)
@@ -178,7 +178,7 @@ proc addSequence(dest: var TPeg, elem: TPeg) =
     else: add(dest, elem)
   else: add(dest, elem)
 
-proc sequence*(a: openArray[TPeg]): TPeg {.
+proc sequence*(a: varargs[TPeg]): TPeg {.
   rtl, extern: "npegs$1".} =
   ## constructs a sequence with all the PEGs from `a`
   multipleOp(pkSequence, addSequence)
@@ -935,7 +935,7 @@ proc replace*(s: string, sub: TPeg, by = ""): string {.
       inc(i, x)
   add(result, substr(s, i))
   
-proc parallelReplace*(s: string, subs: openArray[
+proc parallelReplace*(s: string, subs: varargs[
                       tuple[pattern: TPeg, repl: string]]): string {.
                       rtl, extern: "npegs$1".} = 
   ## Returns a modified copy of `s` with the substitutions in `subs`
@@ -957,7 +957,7 @@ proc parallelReplace*(s: string, subs: openArray[
   add(result, substr(s, i))  
   
 proc transformFile*(infile, outfile: string,
-                    subs: openArray[tuple[pattern: TPeg, repl: string]]) {.
+                    subs: varargs[tuple[pattern: TPeg, repl: string]]) {.
                     rtl, extern: "npegs$1".} =
   ## reads in the file `infile`, performs a parallel replacement (calls
   ## `parallelReplace`) and writes back to `outfile`. Calls ``quit`` if an