fixes regression: overloading by 'var'

compiler/sigmatch.nim

@@ -159,7 +159,7 @@ proc sumGeneric(t: PType): int =
       inc result
       inc isvar
     of tyGenericInvocation, tyTuple:
-      result = ord(t.kind == tyGenericInvocation)
+      result += ord(t.kind == tyGenericInvocation)
       for i in 0 .. <t.len: result += t.sons[i].sumGeneric
       break
     of tyGenericParam, tyExpr, tyStatic, tyStmt, tyTypeDesc: break
@@ -167,7 +167,8 @@ proc sumGeneric(t: PType): int =
         tyString, tyCString, tyInt..tyInt64, tyFloat..tyFloat128,
         tyUInt..tyUInt64:
       return isvar
-    else: return 0
+    else:
+      return 0
 
 #var ggDebug: bool
 

tests/overload/tspec.nim

@@ -12,7 +12,9 @@ ref T
 2
 1
 @[123, 2, 1]
-Called!'''
+Called!
+merge with var
+merge no var'''
 """
 
 # Things that's even in the spec now!
@@ -103,8 +105,14 @@ proc mget*[T](future: FutureVar[T]): var T =
 proc reset*[T](future: FutureVar[T]) =
   echo "Called!"
 
+proc merge[T](x: Future[T]) = echo "merge no var"
+proc merge[T](x: var Future[T]) = echo "merge with var"
+
 when true:
   var foo = newFutureVar[string]()
   foo.mget() = ""
   foo.mget.add("Foobar")
   foo.reset()
+  var bar = newFuture[int]()
+  bar.merge # merge with var
+  merge(newFuture[int]()) # merge no var