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Add regression test for #151316 - #164543
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Adds a regression test for #151316, covering the three examples from the issue.
A plain bisect points at #156976, but that PR only hides the ICE behind the
E0277 error: with
-Zeagerly-emit-delayed-bugsthecould not normalizedelayed bug is still emitted until #159649, and bisecting with that flag lands
exactly on #159649. This is the same as what happened in #156700.
This is similar to the test added in #164272 for #155977 (which also keeps the
delayed bug until #159649), but the examples here also cover
FnOnceprojections and
non_lifetime_binders.The test ICEs on nightly-2026-07-01 and only reports E0277 on current master.
Closes #151316
r? @lcnr
LLM disclosure
The task itself came from the issue (find the fixing PR and add tests).
I used an LLM to run the bisects (including the one with
-Zeagerly-emit-delayed-bugsthat points at #159649), and to help write thetest and draft some texts. I reviewed the test and the results myself, so I
understand the change.