rustc_infer: remove InferCtxt::closure_sig as the FnSig is always shallowly known.#70089
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@bors try @rust-timer queue |
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Awaiting bors try build completion |
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⌛ Trying commit 63811bc with merge 2056ca8947d090a687667e68d89cceab943a3928... |
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☀️ Try build successful - checks-azure |
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Queued 2056ca8947d090a687667e68d89cceab943a3928 with parent 7ceebd9, future comparison URL. |
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Perf looks neutral, probably makes sense outside of explicit closure stress tests. |
nikomatsakis
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Mar 19, 2020
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| // HACK(eddyb) this forces the types equated above into `substs` but | ||
| // it should rely on `ClosureSubsts` providing a constructor, instead. | ||
| let substs = self.resolve_vars_if_possible(&substs); |
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the purpose of this code is to ensure that have a fn type, and not an inference variable that's been equated with a fn type?
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@bors r+ |
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📌 Commit 63811bc has been approved by |
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Rollup of 8 pull requests Successful merges: - rust-lang#67888 (Prefetch some queries used by the metadata encoder) - rust-lang#69934 (Update the mir inline costs) - rust-lang#69965 (Refactorings to get rid of rustc_codegen_utils) - rust-lang#70054 (Build dist-android with --enable-profiler) - rust-lang#70089 (rustc_infer: remove InferCtxt::closure_sig as the FnSig is always shallowly known.) - rust-lang#70092 (hir: replace "items" terminology with "nodes" where appropriate.) - rust-lang#70138 (do not 'return' in 'throw_' macros) - rust-lang#70151 (Update stdarch submodule) Failed merges: - rust-lang#70074 (Expand: nix all fatal errors) r? @ghost
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That is,
ClosureSubstsis always created (inrustc_typeck::check::closure) with aFnSig, as the number of inputs is known, even if they might all have inference types.The only useful thing
InferCtxt::closure_sigwas doing is resolving an inference variable used just to get thety::FnPtrcontaining thatFnSigintoClosureSubsts.The ideal way to solve this would be to add a constructor for
ClosureSubsts, that combines the parentSubsts, the closure kind, the signature, and capture types together, but for now I've went with resolving the inference types just after unifying them with the real types.r? @nikomatsakis