fix for template redefinition. test cases added.

tests/compile/tredef.nim

@@ -0,0 +1,29 @@
+template foo(a: int, b: string) = nil
+foo(1, "test")
+
+proc bar(a: int, b: string) = nil
+bar(1, "test")
+
+template foo(a: int, b: string) = bar(a, b)
+foo(1, "test")
+
+block:
+  proc bar(a: int, b: string) = nil
+  template foo(a: int, b: string) = nil
+  foo(1, "test")
+  bar(1, "test")
+  
+proc baz =
+  proc foo(a: int, b: string) = nil
+  proc foo(b: string) =
+    template bar(a: int, b: string) = nil
+    bar(1, "test")
+    
+  foo("test")
+
+  block:
+    proc foo(b: string) = nil
+    foo("test")
+    foo(1, "test")
+
+baz()

tests/reject/tprocredef.nim

@@ -0,0 +1,9 @@
+discard """
+  file: "tprocredef.nim"
+  line: 8
+  errormsg: "redefinition of \'foo\'"
+"""
+
+proc foo(a: int, b: string) = nil
+proc foo(a: int, b: string) = nil
+

tests/run/toverl2.nim

@@ -1,6 +1,6 @@
 discard """
   file: "toverl2.nim"
-  output: "true012"
+  output: "true012innertrue"
 """
 # Test new overloading resolution rules
 
@@ -14,14 +14,20 @@ iterator toverl2(x: int): int =
   while res < x: 
     yield res
     inc(res)
-    
+
 var
   pp: proc (x: bool): string = toverl2
+
 stdout.write(pp(true))
+
 for x in toverl2(3): 
   stdout.write(toverl2(x))
+
+block:
+  proc toverl2(x: int): string = return "inner"
+  stdout.write(toverl2(5))
+  stdout.write(true)
+
 stdout.write("\n")
-#OUT true012
-
-
+#OUT true012innertrue
 

tests/run/tunittests.nim

@@ -1,2 +1,2 @@
-import uclosures
+import uclosures, utemplates
 

tests/run/utemplates.nim

@@ -0,0 +1,32 @@
+import unittest
+
+template t(a: int): expr = "int"
+template t(a: string): expr = "string"
+
+test "templates can be overloaded":
+  check t(10) == "int"
+  check t("test") == "string"
+
+test "previous definitions can be further overloaded or hidden in local scopes":
+  template t(a: bool): expr = "bool"
+
+  check t(true) == "bool"
+  check t(10) == "int"
+  
+  template t(a: int): expr = "inner int"
+  check t(10) == "inner int"
+  check t("test") == "string"
+
+test "templates can be redefined multiple times":
+  template customAssert(cond: bool, msg: string): stmt =
+    if not cond: fail(msg)
+
+  template assertion_failed(body: stmt) =
+    template fail(msg: string): stmt = body
+
+  assertion_failed: check msg == "first fail path"
+  customAssert false, "first fail path"
+
+  assertion_failed: check msg == "second fail path"  
+  customAssert false, "second fail path"
+