bugfix: fixed built-in 'reset'

doc/nimrodc.txt

@@ -315,7 +315,8 @@ ENDB. See the documentation of `endb <endb.html>`_ for further information.
 Volatile pragma
 ---------------
 The `volatile`:idx: pragma is for variables only. It declares the variable as
-``volatile``, whatever that means in C/C++.
+``volatile``, whatever that means in C/C++ (its semantics are not well defined
+in C/C++).
 
 **Note**: This pragma will not exist for the LLVM backend.
 
@@ -330,7 +331,8 @@ input management. To start Nimrod in interactive mode use the command
 ``nimrod i``. To quit use the ``quit()`` command. To determine whether an input
 line is an incomplete statement to be continued these rules are used:
 
-1. The line ends with ``[-+*/\\<>!\?\|%&$@~,;:=#^]\s*$``.
+1. The line ends with ``[-+*/\\<>!\?\|%&$@~,;:=#^]\s*$`` (operator symbol 
+   followed by optional whitespace).
 2. The line starts with a space (indentation).
 3. The line is within a triple quoted string literal. However, the detection 
    does not work if the line contains more than one ``"""``.

lib/system/assign.nim

@@ -139,10 +139,10 @@ proc genericResetAux(dest: Pointer, n: ptr TNimNode) =
   of nkList:
     for i in 0..n.len-1: genericResetAux(dest, n.sons[i])
   of nkCase:
-    zeroMem(cast[pointer](d +% n.offset), n.typ.size)
     var m = selectBranch(dest, n)
     if m != nil: genericResetAux(dest, m)
-
+    zeroMem(cast[pointer](d +% n.offset), n.typ.size)
+  
 proc genericReset(dest: Pointer, mt: PNimType) =
   var d = cast[TAddress](dest)
   sysAssert(mt != nil)