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Document how to get the type of a default associated type #106979

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Jan 20, 2023
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Document how to get the type of a default associated type #106979

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5 changes: 5 additions & 0 deletions compiler/rustc_middle/src/ty/assoc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,11 @@ impl AssocItem {
Ident::new(self.name, tcx.def_ident_span(self.def_id).unwrap())
}

/// Gets the defaultness of the associated item.
/// To get the default associated type, use the [`type_of`] query on the
/// [`DefId`] of the type.
///
/// [`type_of`]: crate::ty::TyCtxt::type_of
pub fn defaultness(&self, tcx: TyCtxt<'_>) -> hir::Defaultness {
tcx.impl_defaultness(self.def_id)
}
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