templater: pass (context, mapping) down to unwraphybrid() See the subsequent patches for why. I initially thought it would be wrong to pass a mapping to flatten() and stringify() since these functions may be applied to a tree of generators, where each node should be bound to the mapping when it was evaluated. But, actually that isn't a problem. If an intermediate node has to override a mapping dict, it can do on unwraphybrid() and yield "unwrapped" generator of byte strings: "{f(g(v))}" # literal template example. ^^^^ # g() want to override a mapping, so it returns a wrapped # object 'G{V}' with partial mapping 'lm' attached. ^^^^^^^ # f() stringifies 'G{V}', starting from a mapping 'm'. # when unwrapping 'G{}', it updates 'm' with 'lm', and # passes it to 'V'. This structure is important for the formatter (and the hgweb) to build a static template keyword, which can't access a mapping dict until evaluation phase.

--- a/mercurial/templatefuncs.py	Mon Apr 02 16:18:33 2018 -0700
+++ b/mercurial/templatefuncs.py	Sat Mar 17 20:09:05 2018 +0900
@@ -283,7 +283,8 @@
     keytype = getattr(haystack, 'keytype', None)
     try:
         needle = evalrawexp(context, mapping, args[0])
-        needle = templateutil.unwrapastype(needle, keytype or bytes)
+        needle = templateutil.unwrapastype(context, mapping, needle,
+                                           keytype or bytes)
         found = (needle in haystack)
     except error.ParseError:
         found = False