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typeck: always expose repeat count `AnonConst`s' parent in `generics_of`. This should reduce some of the confusion around #43408, although, if you look at the changed test outputs (for the last commit), they all hit #68436, so nothing new will start compiling. We can let counts of "repeat expressions" (`N` in `[x; N]`) always have the correct generics parenting, because they're always in a body, so nothing in the `where` clauses or `impl` trait/type of the parent can use it, and therefore no query cycles can occur. <hr/> Other potential candidates we might want to apply the same approach to, are: * ~~(easy) `enum` discriminants (see also #70453)~~ opened #70825 * (trickier) array *type* (not *expression*) lengths nested in: * bodies * types of (associated or not) `const`/`static` * RHS of `type` aliases and associated `type`s * `fn` signatures We should've done so from the start, the only reason we haven't is because I was squeamish about blacklisting some of the cases, but if we whitelist instead we should be fine. Also, lazy normalization is taking forever 😞. <hr/> There's also 5 other commits here: * "typeck: track any errors injected during writeback and taint tables appropriately." - fixes #66706, as the next commit would otherwise trigger an ICE again * "typeck: workaround WF hole in `to_const`." - its purpose is to emulate most of #70107's direct effect, at least in the case of repeat expressions, where the count always goes through `to_const` * this is the reason no new code can really compile, as the WF checks require #68436 to bypass * however, this has more test changes than I hoped, so it should be reviewed separately, and maybe even landed separately (as #70107 might take a while, as it's blocked on a few of my PRs) * "ty: erase lifetimes early in `ty::Const::eval`." - first attempt at fixing #70773 * still useful, I believe the new approach is less likely to cause issues long-term * I could take this out or move it into another PR if desired or someone else could take over (cc @skinny121) * "traits/query/normalize: add some `debug!` logging for the result." - debugging aid for #70773 * "borrow_check/type_check: normalize `Aggregate` and `Call` operands." - actually fixes #70773 r? @nikomatsakis cc @pnkfelix @varkor @yodaldevoid @oli-obk @estebank
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rustcand its testslibstd- Various submodules for tools, like rustdoc, rls, etc.
For more information on how various parts of the compiler work, see the rustc dev guide.