type constraints; tuple lifting

tests/accept/compile/tconstraints.nim

@@ -0,0 +1,15 @@
+
+
+proc myGenericProc[T: object|tuple|int|ptr|ref|distinct](x: T): string = 
+  result = $x
+
+type
+  TMyObj = tuple[x, y: int]
+
+var
+  x: TMyObj
+
+assert myGenericProc(232) == "232"
+assert myGenericProc(x) == "(x: 0, y: 0)"
+
+

tests/accept/compile/tgenericmatcher.nim

@@ -0,0 +1,19 @@
+
+type
+  TMatcherKind = enum
+    mkTerminal, mkSequence, mkAlternation, mkRepeat
+  TMatcher[T] = object
+    case kind: TMatcherKind
+    of mkTerminal:
+      value: T
+    of mkSequence, mkAlternation:
+      matchers: seq[TMatcher[T]]
+    of mkRepeat:
+      matcher: PMatcher[T]
+      min, max: int
+  PMatcher[T] = ref TMatcher[T]
+
+var 
+  m: PMatcher[int]
+
+

tests/accept/compile/tgenericrefs.nim

@@ -0,0 +1,24 @@
+# Compiles:
+
+type 
+  TA[T] = object
+  PA[T] = ref TA[T]
+var a: PA[string]
+
+# Compiles unless you use var a: PA[string]
+type 
+  PA = ref TA
+  TA[T] = object
+
+
+# Cannot instanciate:
+type 
+  TA[T] = object
+    a: PA[T]
+  PA[T] = ref TA[T]
+
+type 
+  PA[T] = ref TA[T]
+  TA[T] = object
+
+