Rollup of 6 pull requests #67917
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Rollup of 6 pull requests #67917
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Suggested by @lzutao
Fixes rust-lang#67639 `Instance.ty` assumes that we are in a fully monomorphic context (e.g. codegen), and can therefore use an empty `ParamEnv` when performing normalization. Howver, the MIR constant evaluator code ends up calling `Instance.ty` as a result of us attemptign to 'speculatively' const-evaluate generic functions during const propagation. As a result, we may end up with projections involving type parameters (e.g. <T as MyTrait>::Bar>) in the type we are trying to normalize. Normalization expects us to have proper predicates in the `ParamEnv` for such projections, and will ICE if we don't. This commit adds a new method `Instance.ty_env`, which takes a `ParamEnv` for use during normalization. The MIR const-evaluator code is changed to use this method, passing in the proper `ParamEnv` for the context at hand.
Co-Authored-By: Wesley Wiser <wwiser@gmail.com>
This error may be produced during intermediate failed attempts at evaluation of a generic const, which may nevertheless succeed later.
spotted while reviewing the todo!macro docs
… r=oli-obk Fix ICE involving calling `Instance.ty` during const evaluation Fixes rust-lang#67639 `Instance.ty` assumes that we are in a fully monomorphic context (e.g. codegen), and can therefore use an empty `ParamEnv` when performing normalization. Howver, the MIR constant evaluator code ends up calling `Instance.ty` as a result of us attemptign to 'speculatively' const-evaluate generic functions during const propagation. As a result, we may end up with projections involving type parameters (e.g. <T as MyTrait>::Bar>) in the type we are trying to normalize. Normalization expects us to have proper predicates in the `ParamEnv` for such projections, and will ICE if we don't. This commit adds a new method `Instance.ty_env`, which takes a `ParamEnv` for use during normalization. The MIR const-evaluator code is changed to use this method, passing in the proper `ParamEnv` for the context at hand.
…partial, r=Amanieu change remove to have a PartialEq bound Addresses [comment](rust-lang#67727 (comment)). References rust-lang#40062 r? @Amanieu
Use `as_deref()` to replace `as_ref().map(...)` Suggested by @lzutao
Silence `TooGeneric` error This error may be produced during intermediate failed attempts at evaluation of a generic const, which may nevertheless succeed later. Fixes rust-lang#66962. r? @eddyb
macros: typo fix spotted while reviewing the todo!macro docs
Use Self instead of $type r? @Dylan-DPC
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@bors r+ rollup=never p=6 |
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📌 Commit 34716a3 has been approved by |
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Rollup of 6 pull requests Successful merges: - #67800 (Fix ICE involving calling `Instance.ty` during const evaluation) - #67873 (change remove to have a PartialEq bound) - #67897 (Use `as_deref()` to replace `as_ref().map(...)`) - #67906 (Silence `TooGeneric` error) - #67912 (macros: typo fix) - #67915 (Use Self instead of $type) Failed merges: r? @ghost
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☀️ Test successful - checks-azure |
This was referenced Jan 6, 2020
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Successful merges:
Instance.tyduring const evaluation #67800 (Fix ICE involving callingInstance.tyduring const evaluation)as_deref()to replaceas_ref().map(...)#67897 (Useas_deref()to replaceas_ref().map(...))TooGenericerror #67906 (SilenceTooGenericerror)Failed merges:
r? @ghost