Add select example for full buffer.#175
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…lang/goose#175 (#545) Verify an example that properly rules out a panicking branch for a send on a full buffered channel with a nonblocking select. - Also show the equivalent with a blocking select(only 1 case so equivalent to send), which will block indefinitely and verify because it deadlocks. - Also show where the proof would fall through if the panic branch's send was on a buffer with space in it Contains Regoose for goose-lang/goose#175
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Some examples to demonstrate the use of select specs to verify a panic branch isn't taken on a buffered channel