next steps for closure iterators

tests/parser/toprprec.nim

@@ -0,0 +1,39 @@
+discard """
+  file: "toprprec.nim"
+  output: "done"
+"""
+# Test operator precedence: 
+
+template `@` (x: expr): expr {.immediate.} = self.x
+template `@!` (x: expr): expr {.immediate.} = x
+template `===` (x: expr): expr {.immediate.} = x
+
+type
+  TO = object
+    x: int
+  TA = tuple[a, b: int, obj: TO]
+  
+proc init(self: var TA): string =
+  @a = 3
+  === @b = 4
+  @obj.x = 4
+  @! === result = "abc"
+  result = @b.`$`
+
+assert 3+5*5-2 == 28- -26-28
+
+proc `^-` (x, y: int): int =  
+  # now right-associative!
+  result = x - y
+  
+assert 34 ^- 6 ^- 2 == 30
+assert 34 - 6 - 2 == 26
+
+
+var s: TA
+assert init(s) == "4"
+
+echo "done"
+
+
+

tests/parser/tprecedence.nim

@@ -0,0 +1,11 @@
+discard """
+  output: "true"
+"""
+
+# Test the new predence rules
+
+proc `\+` (x, y: int): int = result = x + y
+proc `\*` (x, y: int): int = result = x * y
+
+echo 5 \+ 1 \* 9 == 14
+