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Add note to find_const_ty_from_env #142927

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Add a note to find_const_ty_from_env to explain why it has an unwrap which "often" causes ICEs.

Also, uplift it into the new trait solver. This avoids needing to go through the interner to call this method which is otherwise an inherent method in the compiler. I can remove this part if desired.

r? @BoxyUwU

@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 Jun 23, 2025
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rustbot commented Jun 23, 2025

Some changes occurred to the core trait solver

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

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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)
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