gistfile1.erl

-module(e).
-define(YO, 123).
-define(YO2, 10).
-compile([export_all, debug_info]).

f() ->
    case 123 of
        A ->
            A;
        B ->
            B
    end.

h(123) ->
    ok;
h(123) ->
    notok.

g() ->
    case 123 of
        123 when 123 =:= ?YO andalso 123 =/= ?YO2 ->
            ok;
        123 when 123 =:= ?YO andalso 123 =/= ?YO2 ->
            notok
    end.

r(123) when 123 =:= ?YO andalso 123 =/= ?YO2 ->
    ok;
r(123) when 123 =:= ?YO andalso 123 =/= ?YO2 ->
    notok.