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Preventing compilation of a @tailrec method when it does not rewrite, but an inner method does #20143

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merged 1 commit into from
Jun 19, 2024
Merged

Preventing compilation of a @tailrec method when it does not rewrite, but an inner method does #20143

merged 1 commit into from
Jun 19, 2024

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LucySMartin
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Adding warnings if there is an annotated def at the top level that is referenced from an inner def

Fixes #20105

@som-snytt som-snytt mentioned this pull request Apr 9, 2024
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@LucySMartin LucySMartin mentioned this pull request Apr 9, 2024
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@LucySMartin LucySMartin marked this pull request as draft April 9, 2024 20:24
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som-snytt commented Apr 9, 2024 •
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Sorry, I complained about having to rewrite error IDs repeatedly. Probably there is a way to make that part of the build. Or maybe they use it as a rite of passage of sorts.

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Sorry, I complained about having to rewrite error IDs repeatedly.

No worries. I've had much much worse hand numbered files to merge in my time.

@Gedochao Gedochao requested a review from sjrd April 10, 2024 10:56
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sjrd requested changes Apr 10, 2024
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Looks reasonable overall. Missing check files + some minor suggestions.

tests/neg/i20105.scala Outdated Show resolved Hide resolved
compiler/src/dotty/tools/dotc/transform/TailRec.scala Outdated Show resolved Hide resolved
compiler/src/dotty/tools/dotc/transform/TailRec.scala Show resolved Hide resolved
compiler/src/dotty/tools/dotc/reporting/messages.scala Outdated Show resolved Hide resolved
tests/warn/i20105.scala Outdated Show resolved Hide resolved
@LucySMartin LucySMartin marked this pull request as ready for review April 12, 2024 12:02
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sjrd commented Jun 10, 2024

@LucySMartin What's the status of this PR? Do you need help getting the CI to pass?

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LucySMartin commented Jun 10, 2024 via email

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Please ignore the excess off way too many commits. Was fighting either git or the build as it kept putting /weird/ CR and LF tokens into things.
I know Ill need to squash it.

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@sjrd - I'm really sorry but I've given this a few attempts to get line endings correct, but its just not working on the remote.

Are there some standard git settings or arcane windows magic I would need to do to get these things to generate with the correct line endings?

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sjrd commented Jun 17, 2024

On Windows I strongly suggest disabling the "autocrlf" config. I even recommend to that globally. git pretends to be "helpful" with that setting but I have never seen it useful and always harmful.

To disable it:

$ git config --global core.autocrlf false

taken from the git book

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Offering sympathies. I never develop on Windows, but a fellow at the office did and we went through this rigmarole.

I just read that the U.S. Surgeon General will require a warning on the package for autocrlf.

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Yeah - I turned autocrlf off for the reattempt today (and have nuked it on other projects too - I agree from the docs its just bad).
They then generated via sbt with the wonderful line endings of CR-CR-LF.

I saw that comparable check files were just LF (please correct me if that's not right!) so stripped the files down to just LF by hand, and copied them across.

I'm honestly not sure what is wrong with them, and (sorry if this is a problem with my limited use of github) I cant see any way to view what files were actually generated via the CI tests, to validate what line endings its generated in the server side .out files.

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Im an idiot - I see the issue.

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LucySMartin commented Jun 17, 2024
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@LucySMartin LucySMartin Jun 17, 2024 •
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Note to self: drop this when sqashing commits.

sjrd
sjrd reviewed Jun 18, 2024
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Looks good, thank you :)

I'll let you squash in order to have a single commit with a clean commit message. Other than that it will be good to go.

scala#20105: Adding a warning to the case where nested named definiti…
01ada74 
…ons contain non-tail recursive calls.

Code will now compile where a child def calls the parent def in a non-tail position (with the warning).
Code will no longer compile if all calls to a @tailrec method are in named child methods (as these do not tail recurse).
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sjrd commented Jun 19, 2024

Thanks. Is it intended that the commit is not linked to your GitHub account? That's not a problem for us, but it means you won't get the statistics in your favor. :p

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Note in addition to the squash I removed the hex-logging of the comparison.
I might try and make that error message slightly more user friendly at some point, but that's a super low priority.

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Anything I need to do to merge this at this point?
I have another little fix that is going to conflict with this one, would be good to get it in while I still have some downtime.

@sjrd sjrd merged commit eb2ea26 into scala:main Jun 19, 2024
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@LucySMartin LucySMartin deleted the nested-tailrec-defs branch June 19, 2024 14:26
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som-snytt commented Jun 24, 2024 •
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In case sjrd's comment was overlooked, the commit author is

Author: Lucy Martin <[email protected]>

I had that issue once, but I don't remember how I managed my .gitconfig, maybe with a project-specific one?

(I was visiting this PR in order to align Scala 2.)

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Oh oops.
While I don't have any real attachment to my github stats (heck this is a brand new account) I really should be being a lot more careful with that.
Thanks for the call out.

@Kordyjan Kordyjan added this to the 3.5.1 milestone Jul 3, 2024
@WojciechMazur WojciechMazur mentioned this pull request Jul 9, 2024
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@tailrec and nested definitions
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