Support fetching abstract code for modules compiled with Elixir v1.14 and earlier, closes #14987

Author: josevalim

lib/elixir/src/elixir_erl_pass.erl

@@ -551,6 +551,11 @@ extract_bit_type({'-', _, [L, R]}, Acc) ->
 extract_bit_type({unit, _, [Arg]}, Acc) ->
   [{unit, Arg} | Acc];
 extract_bit_type({Other, _, nil}, Acc) ->
+  [Other | Acc];
+%% TODO: Remove me on Elixir v2.0.
+%% Elixir v1.14 and earlier emitted an empty list
+%% and may still be processed via debug_info.
+extract_bit_type({Other, _, []}, Acc) ->
   [Other | Acc].
 
 %% Optimizations that are specific to Erlang and change

lib/elixir/src/elixir_erl_try.erl

@@ -27,8 +27,9 @@ each_clause({'catch', Meta, Raw, Expr}, S) ->
   {Args, Guards} = elixir_utils:extract_splat_guards(Raw),
 
   Match =
+    %% TODO: Remove me on Elixir v2.0.
     %% Elixir v1.17 and earlier emitted single argument
-    %% and may still be processed via debug_info
+    %% and may still be processed via debug_info.
     case Args of
       [X] -> [throw, X];
       [X, Y] -> [X, Y]