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Auto merge of #108080 - oli-obk:FnPtr-trait, r=lcnr

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Add a builtin `FnPtr` trait that is implemented for all function pointers

r? `@ghost`

Rebased version of https://github.com/rust-lang/rust/pull/99531 (plus adjustments mentioned in the PR).

If perf is happy with this version, I would like to land it, even if the diagnostics fix in 9df8e1befb5031a5bf9d8dfe25170620642d3c59 only works for `FnPtr` specifically, and does not generally improve blanket impls.
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bors 2023-03-28 12:50:01 +00:00
commit bf57e8ada6
23 changed files with 476 additions and 180 deletions
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compiler/rustc_const_eval/src/interpret/terminator.rs
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@ -382,6 +382,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
| ty::InstanceDef::FnPtrShim(..)
| ty::InstanceDef::DropGlue(..)
| ty::InstanceDef::CloneShim(..)
| ty::InstanceDef::FnPtrAddrShim(..)
| ty::InstanceDef::Item(_) => {
// We need MIR for this fn
let Some((body, instance)) =