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W0009 - Redundant Assignment

Error​

do() ->
    X = 42,
    Y = X,
 %% ^^^^^ assignment is redundant
    foo(Y).

Explanation​

The error message is indicating that the assignment Y = X is un-necessary. The variable Y is unbound during the assignment and the value resulting from the assignment is then passed to the function foo/1.

A more concise way to express the above would be:

do() ->
    X = 42,
    foo(X).