--- a/mercurial/templatekw.py	Sun Aug 05 16:14:18 2018 +0900
+++ b/mercurial/templatekw.py	Sun Aug 05 16:27:09 2018 +0900
@@ -323,11 +323,8 @@
             rename = getrenamed(fn, ctx.rev())
             if rename:
                 copies.append((fn, rename))
-
-    copies = util.sortdict(copies)
-    return compatdict(context, mapping, 'file_copy', copies,
-                      key='name', value='source', fmt='%s (%s)',
-                      plural='file_copies')
+    return templateutil.compatfilecopiesdict(context, mapping, 'file_copy',
+                                             copies)
 
 # showfilecopiesswitch() displays file copies only if copy records are
 # provided before calling the templater, usually with a --copies
@@ -338,10 +335,8 @@
     only if the --copied switch is set.
     """
     copies = context.resource(mapping, 'revcache').get('copies') or []
-    copies = util.sortdict(copies)
-    return compatdict(context, mapping, 'file_copy', copies,
-                      key='name', value='source', fmt='%s (%s)',
-                      plural='file_copies')
+    return templateutil.compatfilecopiesdict(context, mapping, 'file_copy',
+                                             copies)
 
 @templatekeyword('file_dels', requires={'ctx', 'revcache'})
 def showfiledels(context, mapping):

--- a/mercurial/templateutil.py	Sun Aug 05 16:14:18 2018 +0900
+++ b/mercurial/templateutil.py	Sun Aug 05 16:27:09 2018 +0900
@@ -570,6 +570,21 @@
     f = _showcompatlist(context, mapping, name, data, plural, separator)
     return hybridlist(data, name=element or name, fmt=fmt, gen=f)
 
+def compatfilecopiesdict(context, mapping, name, copies):
+    """Wrap list of (dest, source) file names to support old-style list
+    template and field names
+
+    This exists for backward compatibility. Use hybriddict for new template
+    keywords.
+    """
+    # no need to provide {path} to old-style list template
+    c = [{'name': k, 'source': v} for k, v in copies]
+    f = _showcompatlist(context, mapping, name, c, plural='file_copies')
+    copies = util.sortdict(copies)
+    return hybrid(f, copies,
+                  lambda k: {'name': k, 'path': k, 'source': copies[k]},
+                  lambda k: '%s (%s)' % (k, copies[k]))
+
 def compatfileslist(context, mapping, name, files):
     """Wrap list of file names to support old-style list template and field
     names

--- a/tests/test-template-keywords.t	Sun Aug 05 16:14:18 2018 +0900
+++ b/tests/test-template-keywords.t	Sun Aug 05 16:27:09 2018 +0900
@@ -769,6 +769,24 @@
   fourth
   third
 
+Test file copies dict:
+
+  $ hg log -r8 -T '{join(file_copies, " ")}\n'
+  fourth (second)
+  $ hg log -r8 -T '{file_copies % "{name} <- {source}\n"}'
+  fourth <- second
+  $ hg log -r8 -T '{file_copies % "{path} <- {source}\n"}'
+  fourth <- second
+
+  $ hg log -r8 -T '{join(file_copies_switch, " ")}\n'
+  
+  $ hg log -r8 -C -T '{join(file_copies_switch, " ")}\n'
+  fourth (second)
+  $ hg log -r8 -C -T '{file_copies_switch % "{name} <- {source}\n"}'
+  fourth <- second
+  $ hg log -r8 -C -T '{file_copies_switch % "{path} <- {source}\n"}'
+  fourth <- second
+
 Test index keyword:
 
   $ hg log -l 2 -T '{index + 10}{files % " {index}:{file}"}\n'