rustc_infer::infer::canonical::canonicalizer

Trait CanonicalizeMode

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trait CanonicalizeMode {
    // Required methods
    fn canonicalize_free_region<'tcx>(
        &self,
        canonicalizer: &mut Canonicalizer<'_, 'tcx>,
        r: Region<'tcx>,
    ) -> Region<'tcx>;
    fn any(&self) -> bool;
    fn preserve_universes(&self) -> bool;
}
Expand description

Controls how we canonicalize “free regions” that are not inference variables. This depends on what we are canonicalizing for – e.g., if we are canonicalizing to create a query, we want to replace those with inference variables, since we want to make a maximally general query. But if we are canonicalizing a query response, then we don’t typically replace free regions, as they must have been introduced from other parts of the system.

Required Methods§

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fn canonicalize_free_region<'tcx>( &self, canonicalizer: &mut Canonicalizer<'_, 'tcx>, r: Region<'tcx>, ) -> Region<'tcx>

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fn any(&self) -> bool

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fn preserve_universes(&self) -> bool

Implementors§