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Improvements for implicit searches with top-level type variables #16001

Merged
merged 5 commits into from
Sep 9, 2022
Merged

Improvements for implicit searches with top-level type variables #16001

merged 5 commits into from
Sep 9, 2022

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odersky
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@odersky odersky commented Sep 8, 2022 •
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Two improvements for implicit searches involving type variables.

  1. We now always add a comment when an implicit search is rejected due to the "too unspecific" criterion of Impose implicit search limit #13886, commit
    Refine checking for underspecified implicit queries.

There have been quite a few regressions that hit that problem, so it is good to know immediately what
the issue is.

  1. There is now a better wildcard approximation of higher-kinded type applications. This makes several programs (including original Implicit conversion not applied for the arguments of extension method #15998) compile, which were classified as not specific enough before.

Fixes #15998
Fixes #15820
Fixes #15670
Fixes #15160
Fixes #13986

@odersky odersky marked this pull request as ready for review September 8, 2022 16:09
@odersky odersky changed the title Better diagnostics for too unspecific implicit searches Improvements for specific searches with top-level type variables Sep 9, 2022
@odersky odersky changed the title Improvements for specific searches with top-level type variables Improvements for implicit searches with top-level type variables Sep 9, 2022
@odersky @smarter
Update compiler/src/dotty/tools/dotc/typer/ProtoTypes.scala
741ebf2 
Co-authored-by: Guillaume Martres <smarter@ubuntu.com>
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smarter approved these changes Sep 9, 2022
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LGTM, nice improvement!

@smarter smarter merged commit be375ec into scala:main Sep 9, 2022
@smarter smarter deleted the fix-15998 branch September 9, 2022 13:44
@Kordyjan Kordyjan added the backport:nominated If we agree to backport this PR, replace this tag with "backport:accepted", otherwise delete it. label Sep 12, 2022
@Kordyjan Kordyjan added this to the 3.2.1 backports milestone Sep 15, 2022
@Kordyjan Kordyjan added backport:accepted This PR needs to be backported, once it's been backported replace this tag by "backport:done" and removed backport:nominated If we agree to backport this PR, replace this tag with "backport:accepted", otherwise delete it. labels Sep 15, 2022
@Kordyjan Kordyjan mentioned this pull request Sep 15, 2022
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Kordyjan added a commit that referenced this pull request Sep 15, 2022
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Backport "Improvements for implicit searches with top-level type vari…
c4ce8b0 
…ables" (#16045)

Backports #16001
@Kordyjan Kordyjan added backport:done This PR was successfully backported. and removed backport:accepted This PR needs to be backported, once it's been backported replace this tag by "backport:done" labels Sep 15, 2022
@odersky odersky mentioned this pull request Oct 13, 2022
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@Kordyjan Kordyjan modified the milestones: 3.2.1 backports, 3.2.2 Aug 1, 2023
@mdedetrich mdedetrich mentioned this pull request Sep 15, 2023
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