layout: deal with placeholders, ICE on bound types #107986
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a placeholder type is the same as a param as they represent "this could be any type". A bound type represents a type inside of a `for<T>` or `exists<T>`. When entering a forall or exists `T` should be instantiated as a existential (inference var) or universal (placeholder). You should never observe a bound variable without its binder.
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(this causes an ICE in #107981) |
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This looks reasonable, but I don't have much context here. |
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…iaskrgr Rollup of 6 pull requests Successful merges: - rust-lang#107340 (rustdoc: merge doctest tooltip with notable traits tooltip) - rust-lang#107838 (Introduce `-Zterminal-urls` to use OSC8 for error codes) - rust-lang#107922 (Print disk usage in PGO CI script) - rust-lang#107931 (Intern span when length is MAX_LEN with parent.) - rust-lang#107935 (rustc_ast: Merge impls and reorder methods for attributes and meta items) - rust-lang#107986 (layout: deal with placeholders, ICE on bound types) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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A placeholder type is the same as a param as they represent "this could be any type". A bound type represents a type inside of a
for<T>orexists<T>. When entering a forall or existsTshould be instantiated as a existential (inference var) or universal (placeholder). You should never observe a bound variable without its binder.