Auto merge of #8587 - ehuss:close_output-fix, r=alexcrichton
Fix close_output test.
The close_output test was randomly failing on rust-lang/rust's CI. This should fix the error. I ran the test in a loop on the rust-lang 16-thread CPU for 10,000 times over the course of 1.5 hours without fail. The same stress test without this patch failed relatively easily.
I'm a bit on the fence, as this means the test is no longer testing a realistic scenario (the compiler usually doesn't emit a megabyte of diagnostics). Moving this test to a single-threaded runner should also solve the problem. I can't decide if it matters enough to bother. WDYT?
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