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-module(bigE).
-export([f/1]).
-record(r, {a, b}).
f(#r{b = B} = C) ->
receive
B ->
X = C#r.a,
%% The compiler will do a case to extract the `a` field
%% using a pattern variable named `rec0`. Without
%% legalization the variable will be output as an atom and
%% the compiler will report an error as the following `X +
%% X` will always fail.
REC0 = X + X,
%% If the legalization fails to detect that the default
%% legalization of uppercasing the pattern variable would
%% collide with the `REC0` below, we will get a warning
%% for an unsafe use.
REC0
end.
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