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It does not make sense to return multiple values from a sequence
argument and the Kernel Erlang passes can't cope with it.
The linting pass now knows how to detect this kind of defunct code and
the Core code folding pass is changed to not generate code like that
when optimizing away multiple-valued lets in effect mode.
Reported-by: José Valim
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Local fun variables are disallowed in both Erlang and Core Erlang guards
but core_lint doesn't detect this kind of error, making the compilation
fail later in the BEAM assembly generation. A guard is added to only
allow #c_var{} terms where the name is an atom or an integer, which is
the type used by the inliner when introducing new variables.
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Silence the Dialyzer warning introduced in commit
7b283aa9507b45f2cd403b061ad92ab059fb71b5.
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