Implement "low priority impls" - #159003

Draft

WaffleLapkin wants to merge 12 commits into

rust-lang:mainfrom

WaffleLapkin:low-prio-impls

Commits on Aug 5, 2026

add a doc comment for `fcw!`
WaffleLapkin
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ab950f8
Add `TraitEngine::is_in_probe`
WaffleLapkin
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b1d56bf
add a way to find infer source
WaffleLapkin
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71ccad4
Add `#[rustc_low_priority]` attribute
WaffleLapkin
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26a4627
extract_tupled_inputs_and_output_from_callable: don't crash on self_ty referencing error
WaffleLapkin
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d2dfa09
add `CandidateSource::is_low_priority`
WaffleLapkin
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b6441ef
make things more public
WaffleLapkin
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3574c59
declare a lint for low prio impls
WaffleLapkin
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2abac71
add a way to search for obligation merely mentioning an infer var
WaffleLapkin
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7c5e1c7
implement low priority impls?
WaffleLapkin
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941de12
add tests for low priority impls
WaffleLapkin
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ba856a2
fix `low_priority_impls/never.rs#next` test
WaffleLapkin
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20b4140