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HTTP/2 Upgraded wrongly uses a transparent uninhabited type #3966

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#3967
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HTTP/2 Upgraded wrongly uses a transparent uninhabited type#3966
#3967
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seanmonstar
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A-http2Area: HTTP/2 specific.C-bugCategory: bug. Something is wrong. This is bad!E-hardEffort: hard. Likely requires a deeper understanding of how hyper's internals work.

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@seanmonstar
seanmonstar
opened on Oct 21, 2025

As noted in rust-lang/rust#147588, the H2Upgraded type in hyper wrongly uses a repr(transparent) value on a stuct containing enum Neutered {}. It seems that this was making use of behavior of the current compiler that isn't specified, and would like to be changed.

That code should be refactored to no longer need such a repr(transparent) transmute.

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  1. seanmonstar
    self-assigned this
    on Oct 21, 2025
  2. seanmonstar
    added
    C-bugCategory: bug. Something is wrong. This is bad!
    E-hardEffort: hard. Likely requires a deeper understanding of how hyper's internals work.
    A-http2Area: HTTP/2 specific.
    on Oct 21, 2025
  3. seanmonstar
    closed this as completedin #3967on Nov 10, 2025
  4. pull
    added a commit that references this issue on Nov 10, 2025

    fix(http2): fix internals of HTTP/2 CONNECT upgrades (hyperium#3967)

    58e0e7d
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A-http2Area: HTTP/2 specific.C-bugCategory: bug. Something is wrong. This is bad!E-hardEffort: hard. Likely requires a deeper understanding of how hyper's internals work.

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