Skip to content

regression: "the parameter type T may not live long enough" in offset_of! #150465

Description

@cuviper
[INFO] [stdout] error[E0310]: the parameter type `T` may not live long enough
[INFO] [stdout]    --> src/report/data.rs:310:24
[INFO] [stdout]     |
[INFO] [stdout] 310 |             assert_eq!(offset_of!(ReportData<T>, vtable), 0);
[INFO] [stdout]     |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        the parameter type `T` must be valid for the static lifetime...
[INFO] [stdout]     |                        ...so that the type `T` will meet its required lifetime bounds
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `offset_of` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: consider adding an explicit lifetime bound
[INFO] [stdout]     |
[INFO] [stdout] 308 |         fn check<T: 'static>() {
[INFO] [stdout]     |                   +++++++++

(and several more in the same log)

https://crater-reports.s3.amazonaws.com/beta-1.93-3/beta-2025-12-09/reg/rootcause-internals-0.11.0/log.txt

@rustbot modify labels: +regression-from-stable-to-beta -regression-untriaged

Note: the type definition is struct ReportData<C: 'static>, and the test fn check<T> doesn't require 'static but is only used with static types. Still, this doesn't error on stable 1.92.

Activity

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Metadata

Metadata

Assignees

No one assigned

    Labels

    A-borrow-checkerArea: The borrow checkerC-bugCategory: This is a bug.P-mediumMedium priorityS-has-bisectionStatus: A bisection has been found for this issueS-has-mcveStatus: A Minimal Complete and Verifiable Example has been found for this issueT-typesRelevant to the types team, which will review and decide on the PR/issue.disposition-closeThis PR / issue is in PFCP or FCP with a disposition to close it.finished-final-comment-periodThe final comment period is finished for this PR / Issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.

    Type

    No type

    Projects

    No projects

      Milestone

      Relationships

      None yet

      Development

      No branches or pull requests

      Issue actions