Tracking issue for 1.0.0 release about pin-project HOT 5 CLOSED

Sounds good 👍 If I remember correctly, there are basically only 3 changes required:

• remove helper attributes (remove project* attributes); done in #265
• remove Replace argument (#243 (comment)); done in #266
• change to define projection-type to inside const _: () = {} when the users don't name it; done in #268

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Another likely change is to remove support for rust 1.34-1.36 and remove the build-script, but I have no particular strong opinion on this.

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Released 1.0.0-alpha.1. I'll wait for a few weeks and then release 1.0.0 if we don't have any big issues.

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Previously, I said "we need to decide on a policy when we release 1.0" in #219 (comment).
I think "at least support a year ago compiler, and MSRV bump requires minor version bump" is preferable at this time.
However, I think it is unlikely that we will rely on language features that really require MSRV bump from 1.37.

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FWIW, here is a list of language features/changes that I think may affect pin-project(-lite) in the future:

• safe_packed_borrow become a hard error (rust-lang/rust#27060)
  The currently applied safe_packed_borrow becomes unknown lint and taiki-e/pin-project-lite#26 becomes fixed. There are no code changes on pin-project(-lite) side.
• proc_macro_def_site stabilized (rust-lang/rust#54724)
  We can use this via build script. (Perhaps actually proc-macro2 should handle it.)
• trivial_bounds stabilized (rust-lang/rust#48214)
  The existing code is not broken, so code changes on pin-project(-lite) side are not needed.
• Implemented & stabilized RFC 2145 private in public (rust-lang/rust#48054)
  We can use this via build script. Or the existing code is not broken, so code changes on pin-project(-lite) side are not needed.
• Implemented & stabilized RFC1598 generic associated types (rust-lang/rust#44265)
  We can use this via build script. Or major version bump is needed (breaking change on public API)
• Implemented & stabilized inherent associated types (rust-lang/rust#8995)
  We can use this via build script. Or major version bump is needed (breaking change on public API)

(There are many uncertainties, so this list does not include anything like significant changes in the existing macro system, unapproved RFCs, or pre-RFCs.)

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