an operator for ignoring any exceptions

[Hikaru Nakashima]

Mr. Wadas,
I think whether it can replace by one line helper function is not much
relationship, because `Optional Chaining`, `Throw expressions`, or many
proposals can replace so too.

In addition, there is `optional catch binding` proposal, and this idea is
less dangerous.
Rather, this idea looks natural, because `foo = try bar` is looks like `foo
= do { try { bar }  }` .
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