fixes #2600

compiler/sigmatch.nim

@@ -147,6 +147,7 @@ proc copyCandidate(a: var TCandidate, b: TCandidate) =
 
 proc sumGeneric(t: PType): int =
   var t = t
+  var isvar = 1
   while true:
     case t.kind
     of tyGenericInst, tyArray, tyRef, tyPtr, tyDistinct, tyArrayConstr,
@@ -154,8 +155,9 @@ proc sumGeneric(t: PType): int =
       t = t.lastSon
       inc result
     of tyVar:
-      # but do not make 'var T' more specific than 'T'!
       t = t.sons[0]
+      inc result
+      inc isvar
     of tyGenericInvocation, tyTuple:
       result = ord(t.kind == tyGenericInvocation)
       for i in 0 .. <t.len: result += t.sons[i].sumGeneric
@@ -164,7 +166,7 @@ proc sumGeneric(t: PType): int =
     of tyBool, tyChar, tyEnum, tyObject, tyProc, tyPointer,
         tyString, tyCString, tyInt..tyInt64, tyFloat..tyFloat128,
         tyUInt..tyUInt64:
-      return 1
+      return isvar
     else: return 0
 
 #var ggDebug: bool
@@ -1470,9 +1472,7 @@ proc matchesAux(c: PContext, n, nOrig: PNode,
         m.state = csNoMatch
         return
     if formal.typ.kind == tyVar:
-      if n.isLValue:
+      if not n.isLValue:
-        inc(m.genericMatches, 100)
-      else:
         m.state = csNoMatch
         return
 

tests/overload/tspec.nim

@@ -11,7 +11,8 @@ ref T
 123
 2
 1
-@[123, 2, 1]'''
+@[123, 2, 1]
+Called!'''
 """
 
 # Things that's even in the spec now!
@@ -79,3 +80,31 @@ proc takeV[T](a: varargs[T]) =
 
 takeV([123, 2, 1]) # takeV's T is "int", not "array of int"
 echo(@[123, 2, 1])
+
+# bug #2600
+
+type
+  FutureBase* = ref object of RootObj ## Untyped future.
+
+  Future*[T] = ref object of FutureBase ## Typed future.
+    value: T ## Stored value
+
+  FutureVar*[T] = distinct Future[T]
+
+proc newFuture*[T](): Future[T] =
+  new(result)
+
+proc newFutureVar*[T](): FutureVar[T] =
+  result = FutureVar[T](newFuture[T]())
+
+proc mget*[T](future: FutureVar[T]): var T =
+  Future[T](future).value
+
+proc reset*[T](future: FutureVar[T]) =
+  echo "Called!"
+
+when true:
+  var foo = newFutureVar[string]()
+  foo.mget() = ""
+  foo.mget.add("Foobar")
+  foo.reset()

web/question.txt

@@ -112,6 +112,7 @@ General FAQ
   - jEdit: https://github.com/exhu/nimrod-misc/tree/master/jedit
   - TextMate: Available in bundle installer (`Repository <https://github.com/textmate/nim.tmbundle>`_)
   - Sublime Text: Available via Package Control (`Repository <https://github.com/Varriount/NimLime>`_)
+  - LiClipse: http://www.liclipse.com/ (Eclipse based plugin)
 
 
 .. container:: standout