feat: Add two new diagnostics: one for mismatch in generic arguments count, and another for mismatch in their kind #19479
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Veykril
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| /// This function find the AST fragment that corresponds to an `AssociatedTypeBinding` in the HIR. | ||
| pub fn hir_assoc_type_binding_to_ast( | ||
| segment_args: &ast::GenericArgList, | ||
| binding_idx: u32, | ||
| ) -> Option<ast::AssocTypeArg> { | ||
| segment_args | ||
| .generic_args() | ||
| .filter_map(|arg| match arg { | ||
| ast::GenericArg::AssocTypeArg(it) => Some(it), | ||
| _ => None, | ||
| }) | ||
| .filter(|binding| binding.param_list().is_none() && binding.name_ref().is_some()) | ||
| .nth(binding_idx as usize) | ||
| } | ||
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| /// This function find the AST generic argument from the one in the HIR. Does not support the `Self` argument. | ||
| pub fn hir_generic_arg_to_ast( | ||
| args: &ast::GenericArgList, | ||
| arg_idx: u32, | ||
| has_self_arg: bool, | ||
| ) -> Option<ast::GenericArg> { | ||
| args.generic_args() | ||
| .filter(|arg| match arg { | ||
| ast::GenericArg::AssocTypeArg(_) => false, | ||
| ast::GenericArg::LifetimeArg(arg) => arg.lifetime().is_some(), | ||
| ast::GenericArg::ConstArg(_) | ast::GenericArg::TypeArg(_) => true, | ||
| }) | ||
| .nth(arg_idx as usize - has_self_arg as usize) | ||
| } |
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Naming nit (also the location for them seems unrelated), these don't touch anything hir related
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The hir is against the ast: it finds the AST for the HIR lowered.
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#19624 will probably collide with this once merged |
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… and another for mismatch in their kind Also known as E0747 and E0107. And by the way, rewrite how we lower generic arguments and deduplicate it between paths and method calls. The new version is taken almost straight from rustc. This commit also changes the binders of `generic_defaults()`, to only include the binders of the arguments up to (and not including) the current argument. This make it easier to handle it in the rewritten lowering of generic args. It's also how rustc does it.
It's cute, isn't it?
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Alright, rebased and addressed comments. |
Veykril
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Apr 22, 2025
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Also known as E0747 and E0107.
And by the way, rewrite how we lower generic arguments and deduplicate it between paths and method calls. The new version is taken almost straight from rustc.
This commit also changes the binders of
generic_defaults(), to only include the binders of the arguments up to (and not including) the current argument. This make it easier to handle it in the rewritten lowering of generic args. It's also how rustc does it.This is a step towards #17590, the next step will be to add a quickfix to the count mismatch diagnostic that adds new parameters. Since this became somewhat big I separated the steps.