Simpler diagnostic when passing arg to closure and missing borrow #76362
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…stic_when_passing_arg_to_closure_and_missing_borrow, r=estebank Simpler diagnostic when passing arg to closure and missing borrow fixes rust-lang#64915 I followed roughly the instructions and the older PR rust-lang#76362. The number of references for the expected and the found types will be compared and depending on which has more the diagnostic will be emitted. I'm not quite sure if my approach with the many `span_bug!`s is good, it could lead to some ICEs. Would it be better if those errors are ignored? As far as I know the following code works similarly but in a different context. Is this probably reusable since it looks like it would emit better diagnostics? https://github.com/rust-lang/rust/blob/a688a0305fad9219505a8f2576446510601bafe8/compiler/rustc_hir_analysis/src/check/demand.rs#L713-L1061 When running the tests locally, a codegen test failed. Is there something I can/ should do about that? If you have some improvements/ corrections please say so and I will happily include them. r? `@estebank` (as you added the mentoring instructions to the issue)
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…ic_when_passing_arg_to_closure_and_missing_borrow, r=estebank Simpler diagnostic when passing arg to closure and missing borrow fixes rust-lang#64915 I followed roughly the instructions and the older PR rust-lang#76362. The number of references for the expected and the found types will be compared and depending on which has more the diagnostic will be emitted. I'm not quite sure if my approach with the many `span_bug!`s is good, it could lead to some ICEs. Would it be better if those errors are ignored? As far as I know the following code works similarly but in a different context. Is this probably reusable since it looks like it would emit better diagnostics? https://github.com/rust-lang/rust/blob/a688a0305fad9219505a8f2576446510601bafe8/compiler/rustc_hir_analysis/src/check/demand.rs#L713-L1061 When running the tests locally, a codegen test failed. Is there something I can/ should do about that? If you have some improvements/ corrections please say so and I will happily include them. r? `@estebank` (as you added the mentoring instructions to the issue)
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Hey! It's a working draft for the #64915 issue.
I've started it with help from @estebank but at this point, I have some questions, which I will be glad if someone will little clear it up a bit.
As @estebank suggested, I've done a small initial approach and the next steps are:
So I've got this FnDecl with an array of Ty's (but how to understand which ty from this array should I get, i mean borrow problem can be 2nd 3rd.. any argument in array?)