templater: resolve type of dict key in getmember()

templater: resolve type of dict key in getmember()

This seems more correct and is consistent with the future wrapped.contains()
function, where a key type has to be resolved depending on a container type.

--- a/mercurial/hgweb/webutil.py	Wed Mar 21 11:30:21 2018 +0900
+++ b/mercurial/hgweb/webutil.py	Fri May 04 12:43:15 2018 +0900
@@ -714,6 +714,7 @@
         return sessionvars(copy.copy(self._vars), self._start)
 
     def getmember(self, context, mapping, key):
+        key = templateutil.unwrapvalue(context, mapping, key)
         return self._vars.get(key)
 
     def itermaps(self, context):

--- a/mercurial/templatefuncs.py	Wed Mar 21 11:30:21 2018 +0900
+++ b/mercurial/templatefuncs.py	Fri May 04 12:43:15 2018 +0900
@@ -262,7 +262,7 @@
         raise error.ParseError(_("get() expects two arguments"))
 
     dictarg = evalwrapped(context, mapping, args[0])
-    key = evalfuncarg(context, mapping, args[1])
+    key = evalrawexp(context, mapping, args[1])
     try:
         return dictarg.getmember(context, mapping, key)
     except error.ParseError as err:

--- a/mercurial/templateutil.py	Wed Mar 21 11:30:21 2018 +0900
+++ b/mercurial/templateutil.py	Fri May 04 12:43:15 2018 +0900
@@ -41,6 +41,7 @@
     def getmember(self, context, mapping, key):
         """Return a member item for the specified key
 
+        The key argument may be a wrapped object.
         A returned object may be either a wrapped object or a pure value
         depending on the self type.
         """
@@ -147,6 +148,7 @@
         # TODO: maybe split hybrid list/dict types?
         if not util.safehasattr(self._values, 'get'):
             raise error.ParseError(_('not a dictionary'))
+        key = unwrapastype(context, mapping, key, self.keytype)
         return self._wrapvalue(key, self._values.get(key))
 
     def _wrapvalue(self, key, val):