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.raiseError syntax allows an error subtype #2511

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merged 1 commit into from
Sep 19, 2018
Merged

.raiseError syntax allows an error subtype #2511

merged 1 commit into from
Sep 19, 2018

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guersam
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@guersam guersam commented Sep 18, 2018 •
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Inspired by #2480, applying the same trick to .raiseError so that I can write MyException(...).raiseError[IO, Unit], instead of (MyException(...): Throwable).raiseError[IO, Unit].

guersam
guersam commented Sep 18, 2018
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tests/src/test/scala/cats/tests/ApplicativeErrorSuite.scala Outdated
}

test("raiseError syntax allows an error subtype") {
assert(Sub.raiseError[EitherWrapper, Unit].either.isLeft)
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I couldn't keep should === convention here due to the lack of org.scalactic.CanEqual[Either[Super, Unit]]. Any advice?

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@kailuowang kailuowang Sep 18, 2018 •
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Not sure if you need a new instance to test. I assume that the test could be in a form of following code compiles

def a[F[_]](implicit F: ApplicativeError[F, CharSequence]): F[Int] = 
   "sdf".raiseError[F, Int]

This doesn't compile without your change, since "sdf".raiseError would requires a ApplicativeError[F, String])

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That's much better! I'll take it and move to SyntaxSuite.

@guersam guersam force-pushed the guersam/raiseerror-syntax-subtype branch from 9813b36 to bdf9f9e Compare September 18, 2018 05:29
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Codecov Report

Merging #2511 into master will not change coverage.
The diff coverage is n/a.

Impacted file tree graph

@@           Coverage Diff           @@
##           master    #2511   +/-   ##
=======================================
  Coverage   95.38%   95.38%           
=======================================
  Files         357      357           
  Lines        6528     6528           
  Branches      281      281           
=======================================
  Hits         6227     6227           
  Misses        301      301
Impacted Files Coverage Δ
.../src/main/scala/cats/syntax/applicativeError.scala 100% <ø> (ø) ⬆️

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1911e8b...053b5d3. Read the comment docs.

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guersam commented Sep 19, 2018

Applied @kailuowang's feedback and confirmed that new test doesn't compile with current master:

[error] /home/guersam/workspace/github/cats/tests/src/test/scala/cats/tests/SyntaxSuite.scala:353:32: could not find implicit value for parameter F: cats.ApplicativeError[F,String]
[error]     val fea = "meow".raiseError[F, A]
[error]                                ^
[error] one error found
[error] (testsJVM / Test / compileIncremental) Compilation failed
[error] Total time: 4 s, completed Sep 19, 2018 10:20:53 AM

@guersam guersam force-pushed the guersam/raiseerror-syntax-subtype branch from 053b5d3 to e2da593 Compare September 19, 2018 02:53
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codecov-io commented Sep 19, 2018 •
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Codecov Report

Merging #2511 into master will not change coverage.
The diff coverage is n/a.

Impacted file tree graph

@@           Coverage Diff           @@
##           master    #2511   +/-   ##
=======================================
  Coverage   95.38%   95.38%           
=======================================
  Files         357      357           
  Lines        6528     6528           
  Branches      281      278    -3     
=======================================
  Hits         6227     6227           
  Misses        301      301
Impacted Files Coverage Δ
.../src/main/scala/cats/syntax/applicativeError.scala 100% <ø> (ø) ⬆️

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8c39153...e2da593. Read the comment docs.

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guersam commented Sep 19, 2018

I don't see any reason of the CI failure in scala 2.13.0-M4 😢 TRAVIS_SCALA_VERSION=2.13.0-M4 scripts/travis-publish.sh runs fine on my machine.

kailuowang
kailuowang approved these changes Sep 19, 2018
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Thanks!

@kailuowang kailuowang merged commit 263587a into typelevel:master Sep 19, 2018
@danslapman danslapman mentioned this pull request Sep 19, 2018
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@kailuowang kailuowang mentioned this pull request Sep 19, 2018
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Heh, nice to see that my PR inspired somebody literally at the other end of the world!

@kailuowang kailuowang added this to the 1.5 milestone Oct 30, 2018
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@kailuowang kailuowang kailuowang approved these changes

@LukaJCB LukaJCB LukaJCB approved these changes

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