Muex.
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Elixir-specific mutator that deletes a <- clause from a with expression.
For a with containing two or more <- clauses, produces one mutation per
<- clause that removes it while preserving the do/else block and any
bare (non-<-) expressions.
Some deletions may produce code that no longer compiles (a later clause or the
body referencing the deleted binding); those are reported as invalid mutants
by the runner rather than survivors. A clause whose removal compiles and
passes the suite points at a with step the tests do not depend on.