use 'using' instead of 'sig' keyword; cleans up new features a bit

tests/casestmt/tcaseexpr1.nim

@@ -11,7 +11,7 @@ discard """
 type
   E = enum A, B, C
 
-proc foo(x): auto =
+proc foo(x: int): auto =
   return case x
     of 1..9: "digit"
     else: "number"

tests/generics/tbadgenericlambda.nim

@@ -3,5 +3,5 @@ discard """
   line: 6
 """
 
-let x = proc (x, y): auto = x + y
+let x = proc (x, y: auto): auto = x + y
 

tests/generics/tgeneric0.nim

@@ -18,7 +18,7 @@ proc foo[T](p: TType[T, range[0..2]]) =
 
 #bug #1366
 
-proc reversed(x) =
+proc reversed(x: auto) =
   for i in countdown(x.low, x.high):
     echo i
 

tests/generics/tgenericlambda.nim

@@ -5,15 +5,15 @@ discard """
 proc test(x: proc (a, b: int): int) =
   echo x(5, 5)
 
-test(proc (a, b): auto = a + b)
+test(proc (a, b: auto): auto = a + b)
 
-test do (a, b) -> auto: a + b
+test do (a, b: auto) -> auto: a + b
 
 proc foreach[T](s: seq[T], body: proc(x: T)) =
   for e in s:
     body(e)
 
-foreach(@[1,2,3]) do (x):
+foreach(@[1,2,3]) do (x: auto):
   echo x
 
 proc foo =

tests/macros/tclosuremacro.nim

@@ -26,7 +26,7 @@ proc noReturn(x: () -> void) =
 proc doWithOneAndTwo(f: (int, int) -> int): int =
   f(1,2)
 
-echo twoParams(proc (a, b): auto = a + b)
+echo twoParams(proc (a, b: auto): auto = a + b)
 echo twoParams((x, y) => x + y)
 
 echo oneParam(x => x+5)

tests/misc/tupcomingfeatures.nim

@@ -0,0 +1,39 @@
+discard """
+  output: '''0 -2 0
+  0 -2'''
+"""
+
+{.this: self.}
+
+type
+  Foo {.partial.} = object
+    a, b: int
+
+type
+  tupcomingfeatures.Foo = object
+    x: int
+
+proc yay(self: Foo) =
+  echo a, " ", b, " ", x
+
+proc footest[T](self: var Foo, a: T) =
+  b = 1+a
+  yay()
+
+proc nongeneric(self: Foo) =
+  echo a, " ", b
+
+var ff: Foo
+footest(ff, -3)
+ff.nongeneric
+
+{.experimental.}
+using
+  c: Foo
+  x, y: int
+
+proc usesSig(c) =
+  echo "yummy"
+
+proc foobar(c, y) =
+  echo "yay"

tests/template/tit.nim

@@ -5,7 +5,7 @@ template someIt(a, pred: expr): expr =
   var it {.inject.} = 0
   pred
 
-proc aProc(n) =
+proc aProc(n: auto) =
   n.someIt(echo(it))
 
 aProc(89)

tests/typerel/trettypeinference.nim

@@ -5,8 +5,8 @@ discard """
 
 import typetraits
 
-proc plus(a, b): auto = a + b
-proc makePair(a, b): auto = (first: a, second: b)
+proc plus(a, b: auto): auto = a + b
+proc makePair(a, b: auto): auto = (first: a, second: b)
 
 proc `+`(a, b: string): seq[string] = @[a, b]
 
@@ -19,7 +19,7 @@ static: assert p[0].type is string
 echo i.type.name
 echo s.type.name
 
-proc inst(a): auto =
+proc inst(a: auto): auto =
   static: echo "instantiated for ", a.type.name
   result = a