added getOrDefault; bootstrapping works again

compiler/importer.nim

@@ -121,7 +121,7 @@ proc importAllSymbolsExcept(c: PContext, fromMod: PSym, exceptSet: IntSet) =
       if s.kind != skEnumField:
         if s.kind notin ExportableSymKinds:
           internalError(s.info, "importAllSymbols: " & $s.kind)
-        if s.name.id notin exceptSet:
+        if exceptSet.isNil or s.name.id notin exceptSet:
           rawImportSymbol(c, s)
     s = nextIter(i, fromMod.tab)
 
@@ -138,7 +138,7 @@ proc importForwarded(c: PContext, n: PNode, exceptSet: IntSet) =
       let s = a.sym
       if s.kind == skModule:
         importAllSymbolsExcept(c, s, exceptSet)
-      elif s.name.id notin exceptSet:
+      elif exceptSet.isNil or s.name.id notin exceptSet:
         rawImportSymbol(c, s)
   of nkExportExceptStmt:
     localError(n.info, errGenerated, "'export except' not implemented")

compiler/main.nim

@@ -15,7 +15,7 @@ import
   wordrecg, sem, semdata, idents, passes, docgen, extccomp,
   cgen, jsgen, json, nversion,
   platform, nimconf, importer, passaux, depends, vm, vmdef, types, idgen,
-  tables, docgen2, service, parser, modules, ccgutils, sigmatch, ropes, lists
+  docgen2, service, parser, modules, ccgutils, sigmatch, ropes, lists
 
 from magicsys import systemModule, resetSysTypes
 

compiler/nimblecmd.nim

@@ -48,7 +48,7 @@ proc addPackage(packages: StringTableRef, p: string) =
   let name = p.substr(0, x-1)
   if x < p.len:
     let version = p.substr(x+1)
-    if packages[name] <. version:
+    if packages.getOrDefault(name) <. version:
       packages[name] = version
   else:
     packages[name] = latest

compiler/options.nim

@@ -173,7 +173,7 @@ proc existsConfigVar*(key: string): bool =
   result = hasKey(gConfigVars, key)
 
 proc getConfigVar*(key: string): string =
-  result = gConfigVars[key]
+  result = gConfigVars.getOrDefault key
 
 proc setConfigVar*(key, val: string) =
   gConfigVars[key] = val

compiler/vmmarshal.nim

@@ -239,7 +239,7 @@ proc loadAny(p: var JsonParser, t: PType,
       result = newNode(nkNilLit)
       next(p)
     of jsonInt:
-      result = tab[p.getInt]
+      result = tab.getOrDefault(p.getInt)
       if result.isNil:
         raiseParseErr(p, "cannot load object with address " & $p.getInt)
       next(p)