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ICE in new solver if we see an inference variable #107286

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merged 1 commit into from
Jan 26, 2023

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By construction, we do not expect to see any ty::Infer(ty::TyVar(_)) inference types in the solver (we treat this as ambiguous, since we need to be able to structurally resolve the self type at least one layer to assemble candidates for it). Additionally, since we're doing no freshening, we also don't expect to see any fresh vars of any kind in the solver.

Let's make that an ICE so we can catch any mistakes.

When #107282 lands, we should also ICE there too if we see a non-int/float infer.

r? @lcnr

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. WG-trait-system-refactor The Rustc Trait System Refactor Initiative (-Znext-solver) labels Jan 25, 2023
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rustbot commented Jan 25, 2023

Some changes occurred to the core trait solver

cc @rust-lang/initiative-trait-system-refactor

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I hate fresh inference vars :<

I definitely think that once they're removed, we should only bug on ty::Infer(ty::TyVar(..)) so that it's clear that int and float infer vars have to be handled.

Exhaustively matching on the 3 fresh vars + TyVar is probably a bit cumbersome but imo may still be worth it for now.

I would prefer to do that but it's fine to keep this as is if you disagree here.

r=me after nits

compiler/rustc_trait_selection/src/solve/assembly.rs Outdated Show resolved Hide resolved
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I updated this to exhaustively match on the infer kinds, I actually agree and prefer that. I'll wait until the PR I mentioned matches so I can fix that usage too.

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@bors r=lcnr rollup (only affects new solver)

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bors commented Jan 26, 2023

📌 Commit 0f24e11 has been approved by lcnr

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jan 26, 2023
bors added a commit to rust-lang-ci/rust that referenced this pull request Jan 26, 2023
…iaskrgr

Rollup of 11 pull requests

Successful merges:

 - rust-lang#106407 (Improve proc macro attribute diagnostics)
 - rust-lang#106960 (Teach parser to understand fake anonymous enum syntax)
 - rust-lang#107085 (Custom MIR: Support binary and unary operations)
 - rust-lang#107086 (Print PID holding bootstrap build lock on Linux)
 - rust-lang#107175 (Fix escaping inference var ICE in `point_at_expr_source_of_inferred_type`)
 - rust-lang#107204 (suggest qualifying bare associated constants)
 - rust-lang#107248 (abi: add AddressSpace field to Primitive::Pointer )
 - rust-lang#107272 (Implement ObjectSafe and WF in the new solver)
 - rust-lang#107285 (Implement `Generator` and `Future` in the new solver)
 - rust-lang#107286 (ICE in new solver if we see an inference variable)
 - rust-lang#107313 (Add Style Team Triagebot config)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit dd08f35 into rust-lang:master Jan 26, 2023
@rustbot rustbot added this to the 1.69.0 milestone Jan 26, 2023
bjorn3 pushed a commit to bjorn3/rust that referenced this pull request Feb 9, 2023
…iaskrgr

Rollup of 11 pull requests

Successful merges:

 - rust-lang#106407 (Improve proc macro attribute diagnostics)
 - rust-lang#106960 (Teach parser to understand fake anonymous enum syntax)
 - rust-lang#107085 (Custom MIR: Support binary and unary operations)
 - rust-lang#107086 (Print PID holding bootstrap build lock on Linux)
 - rust-lang#107175 (Fix escaping inference var ICE in `point_at_expr_source_of_inferred_type`)
 - rust-lang#107204 (suggest qualifying bare associated constants)
 - rust-lang#107248 (abi: add AddressSpace field to Primitive::Pointer )
 - rust-lang#107272 (Implement ObjectSafe and WF in the new solver)
 - rust-lang#107285 (Implement `Generator` and `Future` in the new solver)
 - rust-lang#107286 (ICE in new solver if we see an inference variable)
 - rust-lang#107313 (Add Style Team Triagebot config)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@compiler-errors compiler-errors deleted the new-solver-deny-infers branch August 11, 2023 20:08
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4 participants