[WIP] Rework the entire const trait system#96077

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fee1-dead wants to merge 51 commits into

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fee1-dead-contrib:const_trait

Commits on Jul 15, 2022

Add new generic param
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Add GenericArgDefKind::Constness and tweak generics_of
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Small fixups

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Update rustc_{infer,resolve,typeck,trait_selection}
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Fix more trivial errors
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Address trivial lints

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rustc_const_eval

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runtime matches fall back to non-const PartialEq.

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Small fixups

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Infer constness params from context if missing

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Port some more crates

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Update mir typeck

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typeck and borrowck compile

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Get rustc_privacy to compile

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rustdoc

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clippy

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Start poking ICEs until they melt

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Fix assertion ICE
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Add more information to substitution failure

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Only add constness arg for const_trait traits

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Print GenericArg
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Explicitly handle constness from parents

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Now that constness is optional, we default to not-const if it isn't there

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Constness is optional now

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Remove constness arg from `mk_substs_trait`

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Remove the helper-methods for mk_substs_trait

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Stop appending constness to all substs

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Allow the constness argument anywhere in the generics list

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HACK: Remove all const trait impls and `~const` from libcore/libstd

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Fix up some trivial test changes

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Require explicitly handling the tristate constness

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Actually substitute constness params

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Some tracing for better debugging

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Fix typeck probing code to use constness from FnCtxt
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Introduce ConstnessArg::Infer and fix some tests
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Handle matches added by rebase
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More attempts to fix ui errors
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Merge ::Required and ::Param
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Add CosntnessArg::Const when needed
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Fixed error with more TODOs
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Don't require has_self when adding constness
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Return unimplemented when feature is not enabled
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const impls have constness
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var_for_def uses actual constness sometimes
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Fix more ui tests
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Equate candidates modulo constness
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Revert "HACK: Remove all const trait impls and `~const` from libcore/libstd"
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attempt to fix std ice
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More attempts to fix ICE
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general fixes
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fixup
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