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Auto merge of #78194 - bugadani:generic, r=varkor

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Skip most of `create_substs_for_ast_path` if type is not generic
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bors 2020-11-27 06:53:47 +00:00
commit 72d2a7cd35
1 changed files with 8 additions and 0 deletions
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8
compiler/rustc_typeck/src/astconv/mod.rs
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@ -337,6 +337,14 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
infer_args, infer_args,
); );
// Skip processing if type has no generic parameters.
// Traits always have `Self` as a generic parameter, which means they will not return early
// here and so associated type bindings will be handled regardless of whether there are any
// non-`Self` generic parameters.
if generic_params.params.len() == 0 {
return (tcx.intern_substs(&[]), vec![], arg_count);
}
let is_object = self_ty.map_or(false, |ty| ty == self.tcx().types.trait_object_dummy_self); let is_object = self_ty.map_or(false, |ty| ty == self.tcx().types.trait_object_dummy_self);
struct SubstsForAstPathCtxt<'a, 'tcx> { struct SubstsForAstPathCtxt<'a, 'tcx> {