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[nll] use NLL during bootstrapping #53172

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[nll] use NLL during bootstrapping#53172
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A-NLLArea: Non-lexical lifetimes (NLL)NLL-completeWorking towards the "valid code works" goalT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
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Rust 2018 RC

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@nikomatsakis
nikomatsakis
opened on Aug 7, 2018

An important correctness milestone is to have the compiler itself use NLL when bootstrapping. We've made some stabs at this but we need to start doing it all the time.

Instructions

  • Log into Zulip and head to correct thread to say hi =)
  • Select a crate from the list below
  • Leave a comment that you are trying it
  • Verify that ./x.py build --stage 1 works for you
  • Add #![cfg_attr(not(stage0), feature(nll))] to the lib.rs file
    • This incantation adds #![feature(nll)], but only once we get to stage1 -- otherwise we'd be using the beta version of NLL, which is old and buggy.)
  • Try ./x.py build --stage 1 again and see if it works
  • If so, open a PR

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    A-NLLArea: Non-lexical lifetimes (NLL)NLL-completeWorking towards the "valid code works" goalT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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