Always consider maybe and else as keywords

Summary: Based on D45180059, applied to the latest version of the scanner.

Reviewed By: alanz

Differential Revision: D57834821

fbshipit-source-id: 9e69de9267e82163e574f85e976b993b5af22032

erlang_service/src/erl_scan_otp27.erl

@@ -1583,45 +1583,36 @@ lists_duplicate(N, X, L) -> lists_duplicate(N - 1, X, [X | L]).
 lists_foldl_reverse(Lists, Acc) ->
     lists:foldl(fun lists:reverse/2, Acc, Lists).
 
-%% Dynamic version of reserved_word that knows about the possibility
-%% that enabled features might change the set of reserved words.
--spec reserved_word(Atom :: atom()) -> boolean().
-reserved_word(Atom) ->
-    case f_reserved_word(Atom) of
-        true -> true;
-        false -> lists:member(Atom, erl_features:keywords())
-    end.
-
-%% Static version of reserved_words.  These represent the fixed set of
-%% reserved words.
-f_reserved_word('after') -> true;
-f_reserved_word('begin') -> true;
-f_reserved_word('case') -> true;
-f_reserved_word('try') -> true;
-f_reserved_word('cond') -> true;
-f_reserved_word('catch') -> true;
-f_reserved_word('andalso') -> true;
-f_reserved_word('orelse') -> true;
-f_reserved_word('end') -> true;
-f_reserved_word('fun') -> true;
-f_reserved_word('if') -> true;
-f_reserved_word('let') -> true;
-f_reserved_word('of') -> true;
-f_reserved_word('receive') -> true;
-f_reserved_word('when') -> true;
-f_reserved_word('bnot') -> true;
-f_reserved_word('not') -> true;
-f_reserved_word('div') -> true;
-f_reserved_word('rem') -> true;
-f_reserved_word('band') -> true;
-f_reserved_word('and') -> true;
-f_reserved_word('bor') -> true;
-f_reserved_word('bxor') -> true;
-f_reserved_word('bsl') -> true;
-f_reserved_word('bsr') -> true;
-f_reserved_word('or') -> true;
-f_reserved_word('xor') -> true;
-f_reserved_word(_) -> false.
+reserved_word('after') -> true;
+reserved_word('begin') -> true;
+reserved_word('case') -> true;
+reserved_word('try') -> true;
+reserved_word('cond') -> true;
+reserved_word('catch') -> true;
+reserved_word('andalso') -> true;
+reserved_word('orelse') -> true;
+reserved_word('end') -> true;
+reserved_word('fun') -> true;
+reserved_word('if') -> true;
+reserved_word('let') -> true;
+reserved_word('of') -> true;
+reserved_word('receive') -> true;
+reserved_word('when') -> true;
+reserved_word('bnot') -> true;
+reserved_word('not') -> true;
+reserved_word('div') -> true;
+reserved_word('rem') -> true;
+reserved_word('band') -> true;
+reserved_word('and') -> true;
+reserved_word('bor') -> true;
+reserved_word('bxor') -> true;
+reserved_word('bsl') -> true;
+reserved_word('bsr') -> true;
+reserved_word('or') -> true;
+reserved_word('xor') -> true;
+reserved_word('maybe') -> true;
+reserved_word('else') -> true;
+reserved_word(_) -> false.
 
 char_byte_size(C) ->
     %% TODO: more efficient implementation