ICE in librustc_const_eval: bad ty_hint: TyBool, Int(1, Unsuffixed) #39548
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Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
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My fix attempt is at #39812 . |
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Feb 22, 2017
Fix type hint bug in eval_const_expr_partial() (issue #39548) When evaluating const expressions for things like array lengths, rustc assumes that the operands in comparison expressions (a < b, a == b, a >= b etc) are booleans and sets their type hints accordingly, causing an incorrect compilation error in the case "(FOO < 4)" with "const FOO: i32 = 3" and a compiler panic in the case "(3 < 4)". This fix makes sure that rustc does not assume anything about the types of those operands.
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Feb 25, 2017
[12/12] On-demand type-checking, const-evaluation, MIR building & const-qualification. _This is the last of a series ([prev](#38813)) of patches designed to rework rustc into an out-of-order on-demand pipeline model for both better feature support (e.g. [MIR-based](https://github.com/solson/miri) early constant evaluation) and incremental execution of compiler passes (e.g. type-checking), with beneficial consequences to IDE support as well. If any motivation is unclear, please ask for additional PR description clarifications or code comments._ <hr> As this contains all of the changes that didn't fit neatly into other PRs, I'll be elaborating a bit: ### User-facing changes * when determining whether an `impl Trait` type implements an auto-trait (e.g. `Send` or `Sync`), the function the `impl Trait` came from has to be inferred and type-checking, disallowing cycles * this results from not having an obvious place to put the "deferred obligation" in on-demand atm * while we could model side-effects like that and "post-processing passes" better, it's still more limiting than being able to know the result in the original function (e.g. specialization) *and* there are serious problems around region-checking (if a `Send` impl required `'static`, it wasn't enforced) * early const-eval requires type-checking and const-qualification to be performed first, which means: * you get the intended errors before (if any) constant evaluation error that is simply fallout * associated consts should always work now, and `const fn` type parameters are properly tracked * don't get too excited, array lengths still can't depend on type parameters * #38864 works as intended now, with `Self` being allowed in `impl` bounds * #32205 is largely improved, with associated types being limited to "exact match" `impl`s (as opposed to traversing the specialization graph to resolve unspecified type parameters to their defaults in another `impl` or in the `trait`) *while* checking for overlaps building the specialization graph for that trait - once all the trait impls' have been checked for coherence (including ahead-of-time/on-demand), it's uniform * [crater report](https://gist.github.com/eddyb/bbb869072468c7e08d6d808e75938051) looks clean (aside from `clippy` which broke due to `rustc` internal changes) ### Compiler-internal changes * `ty::Generics` * no longer contains the actual type parameter defaults, instead they're associated with the type parameter's `DefId`, like associated types in a trait definition * this allows computing `ty::Generics` as a leaf (reading only its own HIR) * holds a mapping from `DefIndex` of type parameters to their indices * `ty::AdtDef` * only tracks `#[repr(simd)]` in its `ReprOptions` `repr` field * doesn't contain `enum` discriminant values, but instead each variant either refers to either an explicit value for its discriminant, or the distance from the last explicit discriminant, if any * the `.discriminants(tcx)` method produces an iterator of `ConstInt` values, looking up explicit discriminants in a separate map, if necessary * this allows computing `ty::AdtDef` as a leaf (reading only its own HIR) * Small note: the two above (`Generics`, `AdtDef`), `TraitDef` and `AssociatedItem` should probably end up as part of the HIR, eventually, as they're trivially constructed from it * `ty::FnSig` * now also holds ABI and unsafety, alongside argument types, return type and C variadicity * `&ty::BareFnTy` and `ty::ClosureTy` have been replaced with `PolyFnSig = Binder<FnSig>` * `BareFnTy` was interned and `ClosureTy` was treated as non-trivial to `Clone` because they had a `PolyFnSig` and so used to contain a `Vec<Ty>` (now `&[Ty]`) * `ty::maps` * all the `DepTrackingMap`s have been grouped in a structure available at `tcx.maps` * when creating the `tcx`, a set of `Providers` (one `fn` pointer per map) is required for the local crate, and one for all other crates (i.e. metadata loading), `librustc_driver` plugging the various crates (e.g. `librustc_metadata`, `librustc_typeck`, `librustc_mir`) into it * when a map is queried and the value is missing, the appropriate `fn` pointer from the `Providers` of that crate is called with the `TyCtxt` and the key being queried, to produce the value on-demand * `rustc_const_eval` * demands both `typeck_tables` and `mir_const_qualif` (in preparation for miri) * tracks `Substs` in `ConstVal::Function` for `const fn` calls * returns `TypeckError` if type-checking has failed (or cases that can only be reached if it had) * this error kind is never reported, resulting in less noisy/redundant diagnostics * fixes #39548 (testcase by @larsluthman, taken from #39812, which this supersedes) * on-demand has so far been hooked up to: * `rustc_metadata::cstore_impl`: `ty`, `generics`, `predicates`, `super_predicates`, `trait_def`, `adt_def`, `variances`, `associated_item_def_ids`, `associated_item`, `impl_trait_ref`, `custom_coerce_unsized_kind`, `mir`, `mir_const_qualif`, `typeck_tables`, `closure_kind`, `closure_type` * `rustc_typeck::collect`: `ty`, `generics`, `predicates`, `super_predicates`, `type_param_predicates`, `trait_def`, `adt_def`, `impl_trait_ref` * `rustc_typeck::coherence`: `coherent_trait`, `coherent_inherent_impls` * `rustc_typeck::check`: `typeck_tables`, `closure_type`, `closure_kind` * `rustc_mir::mir_map`: `mir` * `rustc_mir::transform::qualify_consts`: `mir_const_qualif`
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Feb 25, 2017
[12/12] On-demand type-checking, const-evaluation, MIR building & const-qualification. _This is the last of a series ([prev](#38813)) of patches designed to rework rustc into an out-of-order on-demand pipeline model for both better feature support (e.g. [MIR-based](https://github.com/solson/miri) early constant evaluation) and incremental execution of compiler passes (e.g. type-checking), with beneficial consequences to IDE support as well. If any motivation is unclear, please ask for additional PR description clarifications or code comments._ <hr> As this contains all of the changes that didn't fit neatly into other PRs, I'll be elaborating a bit: ### User-facing changes * when determining whether an `impl Trait` type implements an auto-trait (e.g. `Send` or `Sync`), the function the `impl Trait` came from has to be inferred and type-checking, disallowing cycles * this results from not having an obvious place to put the "deferred obligation" in on-demand atm * while we could model side-effects like that and "post-processing passes" better, it's still more limiting than being able to know the result in the original function (e.g. specialization) *and* there are serious problems around region-checking (if a `Send` impl required `'static`, it wasn't enforced) * early const-eval requires type-checking and const-qualification to be performed first, which means: * you get the intended errors before (if any) constant evaluation error that is simply fallout * associated consts should always work now, and `const fn` type parameters are properly tracked * don't get too excited, array lengths still can't depend on type parameters * #38864 works as intended now, with `Self` being allowed in `impl` bounds * #32205 is largely improved, with associated types being limited to "exact match" `impl`s (as opposed to traversing the specialization graph to resolve unspecified type parameters to their defaults in another `impl` or in the `trait`) *while* checking for overlaps building the specialization graph for that trait - once all the trait impls' have been checked for coherence (including ahead-of-time/on-demand), it's uniform * [crater report](https://gist.github.com/eddyb/bbb869072468c7e08d6d808e75938051) looks clean (aside from `clippy` which broke due to `rustc` internal changes) ### Compiler-internal changes * `ty::Generics` * no longer contains the actual type parameter defaults, instead they're associated with the type parameter's `DefId`, like associated types in a trait definition * this allows computing `ty::Generics` as a leaf (reading only its own HIR) * holds a mapping from `DefIndex` of type parameters to their indices * `ty::AdtDef` * only tracks `#[repr(simd)]` in its `ReprOptions` `repr` field * doesn't contain `enum` discriminant values, but instead each variant either refers to either an explicit value for its discriminant, or the distance from the last explicit discriminant, if any * the `.discriminants(tcx)` method produces an iterator of `ConstInt` values, looking up explicit discriminants in a separate map, if necessary * this allows computing `ty::AdtDef` as a leaf (reading only its own HIR) * Small note: the two above (`Generics`, `AdtDef`), `TraitDef` and `AssociatedItem` should probably end up as part of the HIR, eventually, as they're trivially constructed from it * `ty::FnSig` * now also holds ABI and unsafety, alongside argument types, return type and C variadicity * `&ty::BareFnTy` and `ty::ClosureTy` have been replaced with `PolyFnSig = Binder<FnSig>` * `BareFnTy` was interned and `ClosureTy` was treated as non-trivial to `Clone` because they had a `PolyFnSig` and so used to contain a `Vec<Ty>` (now `&[Ty]`) * `ty::maps` * all the `DepTrackingMap`s have been grouped in a structure available at `tcx.maps` * when creating the `tcx`, a set of `Providers` (one `fn` pointer per map) is required for the local crate, and one for all other crates (i.e. metadata loading), `librustc_driver` plugging the various crates (e.g. `librustc_metadata`, `librustc_typeck`, `librustc_mir`) into it * when a map is queried and the value is missing, the appropriate `fn` pointer from the `Providers` of that crate is called with the `TyCtxt` and the key being queried, to produce the value on-demand * `rustc_const_eval` * demands both `typeck_tables` and `mir_const_qualif` (in preparation for miri) * tracks `Substs` in `ConstVal::Function` for `const fn` calls * returns `TypeckError` if type-checking has failed (or cases that can only be reached if it had) * this error kind is never reported, resulting in less noisy/redundant diagnostics * fixes #39548 (testcase by @larsluthman, taken from #39812, which this supersedes) * on-demand has so far been hooked up to: * `rustc_metadata::cstore_impl`: `ty`, `generics`, `predicates`, `super_predicates`, `trait_def`, `adt_def`, `variances`, `associated_item_def_ids`, `associated_item`, `impl_trait_ref`, `custom_coerce_unsized_kind`, `mir`, `mir_const_qualif`, `typeck_tables`, `closure_kind`, `closure_type` * `rustc_typeck::collect`: `ty`, `generics`, `predicates`, `super_predicates`, `type_param_predicates`, `trait_def`, `adt_def`, `impl_trait_ref` * `rustc_typeck::coherence`: `coherent_trait`, `coherent_inherent_impls` * `rustc_typeck::check`: `typeck_tables`, `closure_type`, `closure_kind` * `rustc_mir::mir_map`: `mir` * `rustc_mir::transform::qualify_consts`: `mir_const_qualif`
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Feb 26, 2017
[12/12] On-demand type-checking, const-evaluation, MIR building & const-qualification. _This is the last of a series ([prev](#38813)) of patches designed to rework rustc into an out-of-order on-demand pipeline model for both better feature support (e.g. [MIR-based](https://github.com/solson/miri) early constant evaluation) and incremental execution of compiler passes (e.g. type-checking), with beneficial consequences to IDE support as well. If any motivation is unclear, please ask for additional PR description clarifications or code comments._ <hr> As this contains all of the changes that didn't fit neatly into other PRs, I'll be elaborating a bit: ### User-facing changes * when determining whether an `impl Trait` type implements an auto-trait (e.g. `Send` or `Sync`), the function the `impl Trait` came from has to be inferred and type-checking, disallowing cycles * this results from not having an obvious place to put the "deferred obligation" in on-demand atm * while we could model side-effects like that and "post-processing passes" better, it's still more limiting than being able to know the result in the original function (e.g. specialization) *and* there are serious problems around region-checking (if a `Send` impl required `'static`, it wasn't enforced) * early const-eval requires type-checking and const-qualification to be performed first, which means: * you get the intended errors before (if any) constant evaluation error that is simply fallout * associated consts should always work now, and `const fn` type parameters are properly tracked * don't get too excited, array lengths still can't depend on type parameters * #38864 works as intended now, with `Self` being allowed in `impl` bounds * #32205 is largely improved, with associated types being limited to "exact match" `impl`s (as opposed to traversing the specialization graph to resolve unspecified type parameters to their defaults in another `impl` or in the `trait`) *while* checking for overlaps building the specialization graph for that trait - once all the trait impls' have been checked for coherence (including ahead-of-time/on-demand), it's uniform * [crater report](https://gist.github.com/eddyb/bbb869072468c7e08d6d808e75938051) looks clean (aside from `clippy` which broke due to `rustc` internal changes) ### Compiler-internal changes * `ty::Generics` * no longer contains the actual type parameter defaults, instead they're associated with the type parameter's `DefId`, like associated types in a trait definition * this allows computing `ty::Generics` as a leaf (reading only its own HIR) * holds a mapping from `DefIndex` of type parameters to their indices * `ty::AdtDef` * only tracks `#[repr(simd)]` in its `ReprOptions` `repr` field * doesn't contain `enum` discriminant values, but instead each variant either refers to either an explicit value for its discriminant, or the distance from the last explicit discriminant, if any * the `.discriminants(tcx)` method produces an iterator of `ConstInt` values, looking up explicit discriminants in a separate map, if necessary * this allows computing `ty::AdtDef` as a leaf (reading only its own HIR) * Small note: the two above (`Generics`, `AdtDef`), `TraitDef` and `AssociatedItem` should probably end up as part of the HIR, eventually, as they're trivially constructed from it * `ty::FnSig` * now also holds ABI and unsafety, alongside argument types, return type and C variadicity * `&ty::BareFnTy` and `ty::ClosureTy` have been replaced with `PolyFnSig = Binder<FnSig>` * `BareFnTy` was interned and `ClosureTy` was treated as non-trivial to `Clone` because they had a `PolyFnSig` and so used to contain a `Vec<Ty>` (now `&[Ty]`) * `ty::maps` * all the `DepTrackingMap`s have been grouped in a structure available at `tcx.maps` * when creating the `tcx`, a set of `Providers` (one `fn` pointer per map) is required for the local crate, and one for all other crates (i.e. metadata loading), `librustc_driver` plugging the various crates (e.g. `librustc_metadata`, `librustc_typeck`, `librustc_mir`) into it * when a map is queried and the value is missing, the appropriate `fn` pointer from the `Providers` of that crate is called with the `TyCtxt` and the key being queried, to produce the value on-demand * `rustc_const_eval` * demands both `typeck_tables` and `mir_const_qualif` (in preparation for miri) * tracks `Substs` in `ConstVal::Function` for `const fn` calls * returns `TypeckError` if type-checking has failed (or cases that can only be reached if it had) * this error kind is never reported, resulting in less noisy/redundant diagnostics * fixes #39548 (testcase by @larsluthman, taken from #39812, which this supersedes) * on-demand has so far been hooked up to: * `rustc_metadata::cstore_impl`: `ty`, `generics`, `predicates`, `super_predicates`, `trait_def`, `adt_def`, `variances`, `associated_item_def_ids`, `associated_item`, `impl_trait_ref`, `custom_coerce_unsized_kind`, `mir`, `mir_const_qualif`, `typeck_tables`, `closure_kind`, `closure_type` * `rustc_typeck::collect`: `ty`, `generics`, `predicates`, `super_predicates`, `type_param_predicates`, `trait_def`, `adt_def`, `impl_trait_ref` * `rustc_typeck::coherence`: `coherent_trait`, `coherent_inherent_impls` * `rustc_typeck::check`: `typeck_tables`, `closure_type`, `closure_kind` * `rustc_mir::mir_map`: `mir` * `rustc_mir::transform::qualify_consts`: `mir_const_qualif`
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Feb 28, 2017
[12/12] On-demand type-checking, const-evaluation, MIR building & const-qualification. _This is the last of a series ([prev](#38813)) of patches designed to rework rustc into an out-of-order on-demand pipeline model for both better feature support (e.g. [MIR-based](https://github.com/solson/miri) early constant evaluation) and incremental execution of compiler passes (e.g. type-checking), with beneficial consequences to IDE support as well. If any motivation is unclear, please ask for additional PR description clarifications or code comments._ <hr> As this contains all of the changes that didn't fit neatly into other PRs, I'll be elaborating a bit: ### User-facing changes * when determining whether an `impl Trait` type implements an auto-trait (e.g. `Send` or `Sync`), the function the `impl Trait` came from has to be inferred and type-checking, disallowing cycles * this results from not having an obvious place to put the "deferred obligation" in on-demand atm * while we could model side-effects like that and "post-processing passes" better, it's still more limiting than being able to know the result in the original function (e.g. specialization) *and* there are serious problems around region-checking (if a `Send` impl required `'static`, it wasn't enforced) * early const-eval requires type-checking and const-qualification to be performed first, which means: * you get the intended errors before (if any) constant evaluation error that is simply fallout * associated consts should always work now, and `const fn` type parameters are properly tracked * don't get too excited, array lengths still can't depend on type parameters * #38864 works as intended now, with `Self` being allowed in `impl` bounds * #32205 is largely improved, with associated types being limited to "exact match" `impl`s (as opposed to traversing the specialization graph to resolve unspecified type parameters to their defaults in another `impl` or in the `trait`) *while* checking for overlaps building the specialization graph for that trait - once all the trait impls' have been checked for coherence (including ahead-of-time/on-demand), it's uniform * [crater report](https://gist.github.com/eddyb/bbb869072468c7e08d6d808e75938051) looks clean (aside from `clippy` which broke due to `rustc` internal changes) ### Compiler-internal changes * `ty::Generics` * no longer contains the actual type parameter defaults, instead they're associated with the type parameter's `DefId`, like associated types in a trait definition * this allows computing `ty::Generics` as a leaf (reading only its own HIR) * holds a mapping from `DefIndex` of type parameters to their indices * `ty::AdtDef` * only tracks `#[repr(simd)]` in its `ReprOptions` `repr` field * doesn't contain `enum` discriminant values, but instead each variant either refers to either an explicit value for its discriminant, or the distance from the last explicit discriminant, if any * the `.discriminants(tcx)` method produces an iterator of `ConstInt` values, looking up explicit discriminants in a separate map, if necessary * this allows computing `ty::AdtDef` as a leaf (reading only its own HIR) * Small note: the two above (`Generics`, `AdtDef`), `TraitDef` and `AssociatedItem` should probably end up as part of the HIR, eventually, as they're trivially constructed from it * `ty::FnSig` * now also holds ABI and unsafety, alongside argument types, return type and C variadicity * `&ty::BareFnTy` and `ty::ClosureTy` have been replaced with `PolyFnSig = Binder<FnSig>` * `BareFnTy` was interned and `ClosureTy` was treated as non-trivial to `Clone` because they had a `PolyFnSig` and so used to contain a `Vec<Ty>` (now `&[Ty]`) * `ty::maps` * all the `DepTrackingMap`s have been grouped in a structure available at `tcx.maps` * when creating the `tcx`, a set of `Providers` (one `fn` pointer per map) is required for the local crate, and one for all other crates (i.e. metadata loading), `librustc_driver` plugging the various crates (e.g. `librustc_metadata`, `librustc_typeck`, `librustc_mir`) into it * when a map is queried and the value is missing, the appropriate `fn` pointer from the `Providers` of that crate is called with the `TyCtxt` and the key being queried, to produce the value on-demand * `rustc_const_eval` * demands both `typeck_tables` and `mir_const_qualif` (in preparation for miri) * tracks `Substs` in `ConstVal::Function` for `const fn` calls * returns `TypeckError` if type-checking has failed (or cases that can only be reached if it had) * this error kind is never reported, resulting in less noisy/redundant diagnostics * fixes #39548 (testcase by @larsluthman, taken from #39812, which this supersedes) * on-demand has so far been hooked up to: * `rustc_metadata::cstore_impl`: `ty`, `generics`, `predicates`, `super_predicates`, `trait_def`, `adt_def`, `variances`, `associated_item_def_ids`, `associated_item`, `impl_trait_ref`, `custom_coerce_unsized_kind`, `mir`, `mir_const_qualif`, `typeck_tables`, `closure_kind`, `closure_type` * `rustc_typeck::collect`: `ty`, `generics`, `predicates`, `super_predicates`, `type_param_predicates`, `trait_def`, `adt_def`, `impl_trait_ref` * `rustc_typeck::coherence`: `coherent_trait`, `coherent_inherent_impls` * `rustc_typeck::check`: `typeck_tables`, `closure_type`, `closure_kind` * `rustc_mir::mir_map`: `mir` * `rustc_mir::transform::qualify_consts`: `mir_const_qualif`
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Playing with different ways to do
static_assert!, I found an ICE. Reduced testcase:Happens in stable and nightly; here's the nightly backtrace from play:
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