new tester; all tests categorized

tests/template/ttempl2.nim

@@ -0,0 +1,19 @@
+discard """
+  file: "ttempl2.nim"
+  line: 18
+  errormsg: "undeclared identifier: \'b\'"
+"""
+template declareInScope(x: expr, t: typeDesc): stmt {.immediate.} =
+  var x: t
+  
+template declareInNewScope(x: expr, t: typeDesc): stmt {.immediate.} =
+  # open a new scope:
+  block: 
+    var x: t
+
+declareInScope(a, int)
+a = 42  # works, `a` is known here
+
+declareInNewScope(b, int)
+b = 42  #ERROR_MSG undeclared identifier: 'b'
+