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NLL diagnostics lost special notes re: free ("outer") variables in Fn/FnMut/etc closures #51028

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pnkfelix opened this issue May 24, 2018 · 3 comments
Closed
5 of 6 tasks

NLL diagnostics lost special notes re: free ("outer") variables in Fn/FnMut/etc closures #51028

pnkfelix opened this issue May 24, 2018 · 3 comments
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A-NLL Area: Non Lexical Lifetimes (NLL) NLL-diagnostics Working torwads the "diagnostic parity" goal
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Rust 2018 RC

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@pnkfelix
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pnkfelix commented May 24, 2018 •
edited by matthewjasper
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The following tests used to have nice specific reports about the role of Fn or FnMut in the code (and how it impacts the uses of free variables, aka "outer variables", in the body of the closure), but all of that has been lost in NLL.

  • borrowck/borrowck-in-static.rs
  • issue-21600.rs
  • suggestions/closure-immutable-outer-variable.rs
  • suggestions/fn-closure-mutable-capture.rs
  • borrowck/unboxed-closures-move-upvar-from-non-once-ref-closure.rs

I suspect the following are also fundamentally related, though the particular diagnostics differ. (We may well want to branch them off into their own independent issues.)

  • closure_context/issue-42065.rs
    • (here instead of reporting an error about Fn/FnMut/FnOnce, we instead point out that the closure in question cannot be invoked multiple times; i.e. we must have inferred it to be an FnOnce, but that isn't part of the presented error message, for better or for worse).

(This list of tests is drawn from an informal paper document that I have been using to keep notes for myself as I work on this...)
@pnkfelix pnkfelix added A-NLL Area: Non Lexical Lifetimes (NLL) WG-compiler-nll NLL-diagnostics Working torwads the "diagnostic parity" goal labels May 24, 2018
@nikomatsakis
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nikomatsakis commented Jul 3, 2018 •
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I don't think issue-21600.rs fits with the others here wait

@nikomatsakis
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I categorize this as Release Candidate — doesn't feel like a must have for Edition Preview

@matthewjasper matthewjasper self-assigned this Jul 8, 2018
This was referenced Jul 13, 2018
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bors added a commit that referenced this issue Jul 21, 2018
@bors
Auto merge of #52405 - matthewjasper:mutability-errors, r=pnkfelix
942b384 
[NLL] Mutability errors

cc #51028
cc #51170
cc #46559
Closes #46629

* Better explain why the place is immutable ("immutable item" is gone)
* Distinguish &T and *const T
* Use better spans when a mutable borrow is for a closure capture

r? @pnkfelix
bors added a commit that referenced this issue Jul 22, 2018
@bors
Auto merge of #52359 - matthewjasper:combine-move-error-reporting, r=…
aeca042 
…pnkfelix

[NLL] Small move error reporting improvements

* Use a MirBorrowckContext when reporting errors to be more uniform with other error reporting
* Add a special message for the case of trying to move from capture variables in `Fn` and `FnMut` closures.

part of #51028
@matthewjasper matthewjasper removed their assignment Jul 22, 2018
@pnkfelix pnkfelix mentioned this issue Jul 31, 2018
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@nikomatsakis
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Closing, this seems done.

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