feat: Add two new diagnostics: one for mismatch in generic arguments count, and another for mismatch in their kind #19479
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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.
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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.