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This commit does the following:
- Replaces use of rustc_type_ir by rustc_middle in rustc_infer.
- The DelayedMap type is exposed by rustc_middle so everything can be
accessed through rustc_middle in a coherent manner.
- API-layer traits, like InferCtxtLike, Interner or inherent::* must be
accessed via rustc_type_ir, not rustc_middle::ty. For this reason
these are not reexported by rustc_middle::ty.
- Replaces use of ty::Interner by rustc_type_ir::Interner in
rustc_trait_selection
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From `rustc_middle::infer` to `rustc_infer::infer`. Because everything
in it is only used within `rustc_infer`, and no longer needs to be
`pub`. Plus it's always good to make the huge `rustc_middle` crate
smaller.
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It helps people reading the code understand how widely things are used.
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The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.
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`InferCtxt::next_{ty,const}_var*` all take an origin, but the
`param_def_id` is almost always `None`. This commit changes them to just
take a `Span` and build the origin within the method, and adds new
methods for the rare cases where `param_def_id` might not be `None`.
This avoids a lot of tedious origin building.
Specifically:
- next_ty_var{,_id_in_universe,_in_universe}: now take `Span` instead of
`TypeVariableOrigin`
- next_ty_var_with_origin: added
- next_const_var{,_in_universe}: takes Span instead of ConstVariableOrigin
- next_const_var_with_origin: added
- next_region_var, next_region_var_in_universe: these are unchanged,
still take RegionVariableOrigin
The API inconsistency (ty/const vs region) seems worth it for the
large conciseness improvements.
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warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_session\src\config.rs:2013:16
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2013 | early_dcx: &mut EarlyDiagCtxt,
| ^^^^^^^^^^^^^^^^^^ help: consider changing to: `&EarlyDiagCtxt`
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= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_ast_passes\src\ast_validation.rs:1555:11
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1555 | this: &mut AstValidator<'_>,
| ^^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&AstValidator<'_>`
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= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_infer\src\infer\snapshot\fudge.rs:16:12
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16 | table: &mut UnificationTable<'_, 'tcx, T>,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&UnificationTable<'_, 'tcx, T>`
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= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
warning: this argument is a mutable reference, but not used mutably
--> compiler\rustc_expand\src\expand.rs:961:13
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961 | parser: &mut Parser<'a>,
| ^^^^^^^^^^^^^^^ help: consider changing to: `&Parser<'a>`
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= warning: changing this function will impact semver compatibility
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
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