Trait rustc_infer::infer::canonical::canonicalizer::CanonicalizeMode

source · 
trait CanonicalizeMode {
    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

Implementors