some fixes for static params usage in macros

compiler/cgen.nim

@@ -962,8 +962,8 @@ proc genMainProc(m: BModule) =
     NimMainBody =
       "N_CDECL(void, NimMain)(void) {$N" &
         "\tPreMain();$N" &
-        "$1$N" &
+        "$1" &
-      "}$N"
+      "}$N$N"
 
     PosixNimMain =
       "int cmdCount;$N" &
@@ -977,20 +977,20 @@ proc genMainProc(m: BModule) =
         "\tcmdCount = argc;$N" &
         "\tgEnv = env;$N" &
         MainProcsWithResult &
-      "}$N"
+      "}$N$N"
   
     StandaloneCMain =
       "int main(void) {$N" &
         MainProcs &
         "\treturn 0;$N" &
-      "}$N"
+      "}$N$N"
     
     WinNimMain = NimMainBody
     
     WinCMain = "N_STDCALL(int, WinMain)(HINSTANCE hCurInstance, $N" &
       "                        HINSTANCE hPrevInstance, $N" &
       "                        LPSTR lpCmdLine, int nCmdShow) {$N" &
-      MainProcsWithResult & "}$N"
+      MainProcsWithResult & "}$N$N"
   
     WinNimDllMain = "N_LIB_EXPORT " & NimMainBody
 
@@ -998,14 +998,14 @@ proc genMainProc(m: BModule) =
       "BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fwdreason, $N" &
       "                    LPVOID lpvReserved) {$N" &
       "\tif(fwdreason == DLL_PROCESS_ATTACH) {$N" & MainProcs & "}$N" &
-      "\treturn 1;$N}$N"
+      "\treturn 1;$N}$N$N"
 
     PosixNimDllMain = WinNimDllMain
     
     PosixCDllMain =
       "void NIM_POSIX_INIT NimMainInit(void) {$N" &
         MainProcs &
-      "}$N"
+      "}$N$N"
 
   var nimMain, otherMain: TFormatStr
   if platform.targetOS == osWindows and
@@ -1034,7 +1034,7 @@ proc genMainProc(m: BModule) =
                               platform.targetOS == osStandalone: "".toRope
                             else: ropecg(m, "\t#initStackBottom();$N")
   inc(m.labels)
-  appcg(m, m.s[cfsProcs], "void PreMain() {$N" & PreMainBody & "}$N", [
+  appcg(m, m.s[cfsProcs], "void PreMain() {$N" & PreMainBody & "}$N$N", [
     mainDatInit, initStackBottomCall, gBreakpoints, otherModsInit])
 
   appcg(m, m.s[cfsProcs], nimMain, [mainModInit, toRope(m.labels)])

compiler/msgs.nim

@@ -94,6 +94,7 @@ type
     errNewSectionExpected, errWhitespaceExpected, errXisNoValidIndexFile, 
     errCannotRenderX, errVarVarTypeNotAllowed, errInstantiateXExplicitely,
     errOnlyACallOpCanBeDelegator, errUsingNoSymbol,
+    errMacroBodyDependsOnGenericTypes,
     errDestructorNotGenericEnough,
     
     errXExpectsTwoArguments, 
@@ -326,6 +327,8 @@ const
     errInstantiateXExplicitely: "instantiate '$1' explicitely",
     errOnlyACallOpCanBeDelegator: "only a call operator can be a delegator",
     errUsingNoSymbol: "'$1' is not a variable, constant or a proc name",
+    errMacroBodyDependsOnGenericTypes: "the macro body cannot be compiled, " &
+                                       "because the parameter '$1' has a generic type",
     errDestructorNotGenericEnough: "Destructor signarue is too specific. " &
                                    "A destructor must be associated will all instantiations of a generic type",
     errXExpectsTwoArguments: "\'$1\' expects two arguments", 

compiler/semtypes.nim

@@ -653,6 +653,10 @@ proc liftParamType(c: PContext, procKind: TSymKind, genericParams: PNode,
   var paramTypId = if not anon and paramType.sym != nil: paramType.sym.name
                    else: nil
 
+  template maybeLift(typ: PType): expr =
+    let lifted = liftingWalk(typ)
+    (if lifted != nil: lifted else: typ)
+
   template addImplicitGeneric(e: expr): expr =
     addImplicitGenericImpl(e, paramTypId)
 
@@ -663,7 +667,10 @@ proc liftParamType(c: PContext, procKind: TSymKind, genericParams: PNode,
   of tyStatic:
     # proc(a: expr{string}, b: expr{nkLambda})
     # overload on compile time values and AST trees
-    result = addImplicitGeneric(c.newTypeWithSons(tyStatic, paramType.sons))
+    let base = paramType.base.maybeLift
+    if base.isMetaType and procKind == skMacro:
+      localError(info, errMacroBodyDependsOnGenericTypes, paramName)
+    result = addImplicitGeneric(c.newTypeWithSons(tyStatic, @[base]))
     result.flags.incl tfHasStatic
   
   of tyTypeDesc:
@@ -671,7 +678,8 @@ proc liftParamType(c: PContext, procKind: TSymKind, genericParams: PNode,
       # naked typedescs are not bindOnce types
       if paramType.base.kind == tyNone and paramTypId != nil and
          paramTypId.id == typedescId.id: paramTypId = nil
-      result = addImplicitGeneric(c.newTypeWithSons(tyTypeDesc, paramType.sons))
+      result = addImplicitGeneric(
+        c.newTypeWithSons(tyTypeDesc, @[paramType.base]))
   
   of tyDistinct:
     if paramType.sonsLen == 1:

compiler/sigmatch.nim

@@ -1029,6 +1029,28 @@ proc paramTypesMatchAux(m: var TCandidate, f, argType: PType,
  
     r = typeRel(m, f, a)
 
+  if r != isNone and m.calleeSym != nil and
+     m.calleeSym.kind in {skMacro, skTemplate}:
+    # XXX: duplicating this is ugly, maybe we should move this
+    # directly into typeRel using return-like templates
+    case r
+    of isConvertible, isIntConv: inc(m.convMatches)
+    of isSubtype, isSubrange: inc(m.subtypeMatches)
+    of isGeneric, isInferred: inc(m.genericMatches)
+    of isInferredConvertible: inc(m.genericMatches); inc(m.convMatches)
+    of isFromIntLit: inc(m.intConvMatches, 256)
+    of isEqual: inc(m.exactMatches)
+    of isNone: discard
+
+    if f.kind == tyStmt and argOrig.kind == nkDo:
+      return argOrig[bodyPos]
+    elif f.kind == tyTypeDesc:
+      return arg
+    elif f.kind == tyStatic:
+      return arg.typ.n
+    else:
+      return argOrig
+  
   case r
   of isConvertible:
     inc(m.convMatches)
@@ -1046,31 +1068,23 @@ proc paramTypesMatchAux(m: var TCandidate, f, argType: PType,
     #result = copyTree(arg)
     result = implicitConv(nkHiddenStdConv, f, copyTree(arg), m, c)
   of isInferred, isInferredConvertible:
+    inc(m.genericMatches)
     if arg.kind in {nkProcDef, nkIteratorDef} + nkLambdaKinds:
       result = c.semInferredLambda(c, m.bindings, arg)
     else:
       let inferred = c.semGenerateInstance(c, arg.sym, m.bindings, arg.info)
       result = newSymNode(inferred, arg.info)
     if r == isInferredConvertible:
+      inc(m.convMatches)
       result = implicitConv(nkHiddenStdConv, f, result, m, c)
   of isGeneric:
     inc(m.genericMatches)
-    if m.calleeSym != nil and m.calleeSym.kind in {skMacro, skTemplate}:
+    result = copyTree(arg)
-      if f.kind == tyStmt and argOrig.kind == nkDo:
+    result.typ = getInstantiatedType(c, arg, m, f)
-        result = argOrig[bodyPos]
+    # BUG: f may not be the right key!
-      elif f.kind == tyTypeDesc:
+    if skipTypes(result.typ, abstractVar-{tyTypeDesc}).kind in {tyTuple}:
-        result = arg
+      result = implicitConv(nkHiddenStdConv, f, copyTree(arg), m, c)
-      elif f.kind == tyStatic:
+      # BUGFIX: use ``result.typ`` and not `f` here
-        result = arg.typ.n
-      else:
-        result = argOrig
-    else:
-      result = copyTree(arg)
-      result.typ = getInstantiatedType(c, arg, m, f)
-      # BUG: f may not be the right key!
-      if skipTypes(result.typ, abstractVar-{tyTypeDesc}).kind in {tyTuple}:
-        result = implicitConv(nkHiddenStdConv, f, copyTree(arg), m, c)
-        # BUGFIX: use ``result.typ`` and not `f` here
   of isFromIntLit:
     # too lazy to introduce another ``*matches`` field, so we conflate
     # ``isIntConv`` and ``isIntLit`` here: