erlang/otp — pull request #280 by nox (2014-03-08 01:34:55+00:00)
Title: Properly handle redundant boolean clauses in sys_core_fold

Boolean case expressions with redundant clauses could make the compiler
crash:

```erlang
case X == 0 of
false -> no;
false -> no;
true -> yes
end.
```

@UlfNorell