hotfix: don't crash for wrong template calls

compiler/evaltempl.nim

@@ -79,7 +79,7 @@ proc evalTemplateArgs(n: PNode, s: PSym; fromHlo: bool): PNode =
                     else: s.ast[genericParamsPos].len
     expectedRegularParams = <s.typ.len
     givenRegularParams = totalParams - genericParams
-
+  if givenRegularParams < 0: givenRegularParams = 0
   if totalParams > expectedRegularParams + genericParams:
     globalError(n.info, errWrongNumberOfArguments)
 

compiler/sigmatch.nim

@@ -256,6 +256,7 @@ proc describeArgs*(c: PContext, n: PNode, startIdx = 1;
       add(result, renderTree(n.sons[i].sons[0]))
       add(result, ": ")
       if arg.typ.isNil and arg.kind notin {nkStmtList, nkDo}:
+        # XXX we really need to 'tryExpr' here!
         arg = c.semOperand(c, n.sons[i].sons[1])
         n.sons[i].typ = arg.typ
         n.sons[i].sons[1] = arg