type trais used to work only on user-defined types. see #202

compiler/evals.nim

@@ -864,8 +864,7 @@ proc evalTypeTrait*(n: PNode, context: PSym): PNode =
   ## XXX: This should be pretty much guaranteed to be true
   # by the type traits procs' signatures, but until the
   # code is more mature it doesn't hurt to be extra safe
-  internalAssert n.sons.len >= 2 and n.sons[1].kind == nkSym and
+  internalAssert n.sons.len >= 2 and n.sons[1].kind == nkSym
-                 n.sons[1].sym.typ.kind == tyTypeDesc
   
   let typ = n.sons[1].sym.typ.skipTypes({tyTypeDesc})
   case n.sons[0].sym.name.s.normalize

tests/run/ttypetraits.nim

@@ -1,10 +1,11 @@
 discard """
   msg:    "int\nstring\nTBar[int]"
-  output: "int\nstring\nTBar[int]"
+  output: "int\nstring\nTBar[int]\nint\nrange 0..2"
 """
 
 import typetraits
 
+# simple case of type trait usage inside/outside of static blocks
 proc foo(x) =
   static:
     var t = type(x)
@@ -22,3 +23,16 @@ foo 10
 foo "test"
 foo bar
 
+# generic params on user types work too
+proc foo2[T](x: TBar[T]) =
+  echo T.name
+
+foo2 bar
+
+# less usual generic params on built-in types
+var arr: array[0..2, int] = [1, 2, 3]
+
+proc foo3[R, T](x: array[R, T]) =
+  echo name(R)
+
+foo3 arr