mudasobwa
Compilation fails on 1.17.0-dev because of lack of “version” meta key
During the upgrade of one of my libraries to 1.17.0, I got the following error message led the compilation to failing.
== Compilation error in file lib/md/parser/engine.ex ==
** (MatchError) no match of right hand side value: false
(elixir 1.17.0-dev) src/elixir_erl_var.erl:16: :elixir_erl_var.translate/4
(stdlib 6.0) lists.erl:2343: :lists.mapfoldl_1/3
(stdlib 6.0) lists.erl:2344: :lists.mapfoldl_1/3
(stdlib 6.0) lists.erl:2343: :lists.mapfoldl_1/3
(stdlib 6.0) lists.erl:2344: :lists.mapfoldl_1/3
The line above in src/elixir_erl_var.erl:16 belongs to one of :elixir_erl_var.translate/4 clauses here
{version, Version} = lists:keyfind(version, 1, Meta),
I would kindly appreciate any hint of under what circumstances Meta requires this :version key. The quick dig did not shed any light and I am a bit lost.
Macro.var/2 does not generate any version in meta. The only suspicious occurrence in elixir code itself would be in protocol.ex:664 as
x = {:x, [line: line, version: -1], __MODULE__}
But amending meta manually to include version in the only place I generate vars did not help.
Thanks!
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sabiwara
If you don’t mind, how did you get to the variable name and meta there? Some compiler flag?
Nothing fancy, just good old print debugging 
translate(Meta, Name, Kind, #elixir_erl{var_names=VarNames} = S) ->
Version = case lists:keyfind(version, 1, Meta) of
{version, V} -> V;
false ->
io:format('Name: ~p~n', [Name]),
io:format('Meta: ~p~n', [Meta]),
io:format('Kind: ~p~n', [Kind]),
throw(error)
end,
which prints
Name: context
Meta: [{line,1278},{column,5}]
Kind: elixir_quote
mudasobwa
Thanks again!
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