dirstate-item: use an explicit __init__ function instead of the attrs one

For now, this is not doing anything special, however we plan to make it different in the future. So we start simple.

Differential Revision: https://phab.mercurial-scm.org/D11117

mercurial/pure/parsers.py

@@ -44,7 +44,7 b' NONNORMAL = -1'
 AMBIGUOUS_TIME = -1
 
 
-@attr.s(slots=True)
+@attr.s(slots=True, init=False)
 class DirstateItem(object):
     """represent a dirstate entry
 
@@ -61,6 +61,12 b' class DirstateItem(object):'
     _size = attr.ib()
     _mtime = attr.ib()
 
+    def __init__(self, state, mode, size, mtime):
+        self._state = state
+        self._mode = mode
+        self._size = size
+        self._mtime = mtime
+
     def __getitem__(self, idx):
         if idx == 0 or idx == -4:
             msg = b"do not use item[x], use item.state"