24da940631
Fix crash when labeling arguments for call_once and friends When calling a method on Fn* traits explicitly, argument diagnostics should point at the called method (eg Fn::call_once), not the underlying callee. This PR makes 3 main changes: * It uses TupleArguments to detect if the user called a Fn* method directly (`my_fn.call_once(…)`) or implicitly (`my_fn(…)`). If it was explicit, argument diagnostics should point at the call_once method, not the underlying callable. * The previous state was causing confusion between the two arguments lists (which could be different lengths), causing an out-of-bounds slice indexing in #128848. I added a length assert to capture the requirement in case this regresses or happens in another case. * Unfortunately, this assert tripped when the required arguments information was not available (`self.get_hir_params_with_generics` was returning an empty Vec), so I've updated that to return None when that information is not available. (cc `@strottos` if you have any comments, since you added this function in #121595) Sorry this causes a bunch of indentation changes, recommend reviewing [ignoring whitespace](https://github.com/rust-lang/rust/pull/129320/files?w=1).) This is my first rustc PR, so please call out if you'd like this split into more commits (or PRs), style nits, etc. I will add a few comments/questions inline. Thank you! Fixes #128848 |
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