Remove the old FOLLOW checking (aka check_matcher_old).#33982
Remove the old FOLLOW checking (aka check_matcher_old).#33982bors merged 1 commit intorust-lang:masterfrom
check_matcher_old).#33982Conversation
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r? @pnkfelix (rust_highfive has picked a reviewer for you, use r? to override) |
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triage: nominated (Nominating since I just want to make sure lang team is aware of the long awaited breaking change here, and also because I'm not 100% sure about the protocol here.) |
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Conclusion from lang-team meeting: let's follow a foreshortened protocol here, but at least post a warning to internals. |
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posted warning to internals: link |
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cc #30450 |
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@LeoTestard does this build locally for you? I'm trying to hack on it and getting errors in libcore that suggests macros are silently failing to expand. |
src/libsyntax/ext/tt/macro_rules.rs
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This check is backwards! < should be ==. 😆
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Ooooh right, I'm so stupid. ><
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@durka I must admit that I haven't tested it and I was waiting for Travis to do it. The error you pointed out is probably the cause. The fact that it fails silently is legit because the errors are supposed to be reported directly by |
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You need to also replace all instances of |
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Actually the macro in issue-30715.rs is no longer legal with these changes. Maybe we should just delete that test? |
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r? @pnkfelix |
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@bors r+ |
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📌 Commit 4dab8ae has been approved by |
Remove the old FOLLOW checking (aka `check_matcher_old`). It was supposed to be removed at the next release cycle but is still in the tree since like 6 months. Potential breaking change, since some cases (such as #25658) will change from a warning to an error. But the warning stating that it will be a hard error in the next release has been there for 6 months now. I think it's safe to break this code. ^_^
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Looks like this broke a number of crates https://internals.rust-lang.org/t/regression-report-stable-2016-05-24-vs-nightly-2016-06-10/3594/6 |
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It was supposed to be removed at the next release cycle but is still in the tree since like 6 months.
Potential breaking change, since some cases (such as #25658) will change from a warning to an error. But the warning stating that it will be a hard error in the next release has been there for 6 months now.
I think it's safe to break this code. ^_^