Blog post on Scala 3 #872

odersky · 2018-04-10T20:18:44Z

No description provided.

odersky · 2018-04-10T20:24:59Z

This one should go out before the macros blog. I propose tomorrow (Wednesday), with the macros blog following on Thursday.

odersky · 2018-04-11T09:13:27Z

The build failures look like this:

./_site/blog/2015/07/26/sip-slip-summary-july-2015.html

External link https://docs.google.com/document/d/1Vza2-B3FzgtleX8RNs6rqRbhOn9jotrUfFB77h0DIGU/edit?hl=en_US#heading=h.bu8cg3api4vx failed: 410 No error

./_site/news/key-transition-2018.html
- External link http://pgp.mit.edu/pks/lookup?op=vindex&search=0xA9052B1B6D92E560 failed: 408 No error

It looks like neither has to do with this blog post (or the other one)

ashawley · 2018-04-11T12:55:21Z

blog/_posts/2018-04-11-scala-3.md

@@ -0,0 +1,52 @@
+---
+layout: blog-page


There's also a Jekyll build warning:

Build Warning: Layout 'blog-page' requested in blog/_posts/2018-04-11-scala-3.md does not exist.

You might need to check the front matter of you blog post is similar to other recent blog posts.

Thanks! There were indeed some differences.

odersky · 2018-04-11T15:23:43Z

Now we get:

./_site/blog/2018/04/11/scala-3.html
- External link https://github.com/scala/scala-lang/blob/master/blog/_posts/2018-04-11-scala-3.md failed: 404 No error
./_site/news/key-transition-2018.html
- External link http://pgp.mit.edu/pks/lookup?op=vindex&search=0xA9052B1B6D92E560 failed: 408 No error
  htmlproofer 3.8.0 | Error: HTML-Proofer found 2 failures!

Who can help debug this?

odersky · 2018-04-11T15:36:15Z

We decided to wait a little bit longer and to consult more people before publishing.

odersky · 2018-04-18T14:17:47Z

Heather or Seth can you have a quick check to see whether we can merge this today? Adriaan has already seen it and LGTM'ed verbally.

odersky · 2018-04-18T14:19:20Z

We plan to publish a blog on macros early next week.

SethTisue · 2018-04-18T14:22:10Z

blog/_posts/2018-04-18-scala-3.md

+title: "Towards Scala 3"
+---
+
+Now that Scala 2.13 is around the corner, it's time to consider the


I think "around the corner" is not the right wording. There is still M4, then M5, then RC1. I would not consider 2.13 "around the corner" until RC1 is out. I think you might simply omit the whole sentence, and then in the "When will it come out?" section, insert "Scala 2.13 will come out later this year."

SethTisue · 2018-04-18T14:27:32Z

blog/_posts/2018-04-18-scala-3.md

+Of course, this statement invites many follow-up questions. Here are
+some answers we can already give today. We expect there will be more
+questions and answers as things shape up.
+


I have repeatedly encountered a persistent misconception among new and/or occasional Scala users that Dotty is somehow a new language. I suggest leading with a "How different are Scala 2 and Scala 3?" section that emphasizes continuity. Perhaps beginning with something like "Scala 2 and Scala 3 are fundamentally the same language. The compiler is new, but nearly everything Scala programmers already know about Scala 2 applies to Scala 3 as well, and most ordinary Scala 2 code will also work on Scala 3 with only minor changes."

Good idea, I have added that wording.

SethTisue · 2018-04-18T14:29:23Z

blog/_posts/2018-04-18-scala-3.md

+_What's new in Scala 3?_
+
+Scala has pioneered the fusion of object-oriented and functional
+programming in a typed setting. Scala 3 will be a big step towards


for a general audience, better "statically typed" than just "typed", IMO. people coming from dynamic languages don't necessarily consider their languages not to be "typed".

I prefer "typed". It's a matter to take back terminology to what it should mean.

SethTisue · 2018-04-18T14:31:44Z

blog/_posts/2018-04-18-scala-3.md

+
+_What about migration?_
+
+Scala 3 is neither source nor binary compatible with Scala 2. However:


suggested wording: "As with previous Scala upgrades, Scala 3 is not binary compatible with Scala 2. They are mostly source compatible, but differences exist." simply saying "not source compatible" sounds more alarming than necessary.

Good point.

SethTisue · 2018-04-18T14:33:11Z

blog/_posts/2018-04-18-scala-3.md

+Scala 3 is neither source nor binary compatible with Scala 2. However:
+
+
+ - Scala 3 code can link against Scala 2 artifacts (Scala 2.12 and upwards).


This is really unclear — you just said they aren't binary compatible, but now they kind of are? In fact, it sounds like Scala 3 and 2 are more binary compatible than e.g. 2.11 and 2.12 were?

Yes, if this feature is mentioned, it needs to be explained; what does it do, how does it work, how is it useful? (I personlly don't understand what it is).

SethTisue · 2018-04-18T14:34:17Z

blog/_posts/2018-04-18-scala-3.md

+ - Scala 3 code can link against Scala 2 artifacts (Scala 2.12 and upwards).
+ - Scala 3 and Scala 2 share the same standard library.
+ - With some small tweaks it is possible to cross-build code for both Scala 2 and 3.
+   We will work on a guide defining the shared language subset that can be compiled under both versions.


Instead of "We will work on", suggest the more confident "We will provide"

SethTisue · 2018-04-18T14:35:22Z

blog/_posts/2018-04-18-scala-3.md

+   and at the same time highlights necessary rewritings as migration warnings.
+ - The compiler can perform many of the rewritings automatically using a `-rewrite` option.
+ - Migration through automatic rewriting will also be offered through the `scalafix` tool,
+   which does not require Scala 3 to be installed.


This seems peculiar and is perhaps an unnecessary level of detail. If I'm migrating to Scala 3 anyway, why do I care if this particular step doesn't require Scala 3 to be present?

SethTisue · 2018-04-18T14:35:51Z

blog/_posts/2018-04-18-scala-3.md

+   Jetbrains has also released a first version of Dotty support in their Scala plugin,
+   and we hope to work with them on further improvements.
+ - REPL: A friendly REPL is supported by the compiler
+ - Docs: A revamped ScalaDoc tool generates docs for viewing in a browser and (in the future) also in the IDE..


s/ScalaDoc/Scaladoc/

SethTisue · 2018-04-18T14:36:19Z

blog/_posts/2018-04-18-scala-3.md

+ - IDEs: IDE support is provided by having `dotc` implement LSP, the Language Server Protocol,
+   including standard operations such as completion and hyperlinking and more advanced ones
+    such as find references or rename. There’s a VS Code plugin incorporating these operations.
+   Jetbrains has also released a first version of Dotty support in their Scala plugin,


s/Jetbrains/JetBrains/

consider writing "Scala 3" here instead of "Dotty"

SethTisue · 2018-04-18T14:37:01Z

blog/_posts/2018-04-18-scala-3.md

+   including standard operations such as completion and hyperlinking and more advanced ones
+    such as find references or rename. There’s a VS Code plugin incorporating these operations.
+   Jetbrains has also released a first version of Dotty support in their Scala plugin,
+   and we hope to work with them on further improvements.


s/hope/intend/

SethTisue · 2018-04-18T14:41:01Z

Heather or Seth can you have a quick check to see whether we can merge this today

The only change I feel strongly about is that Scala 2.13 should not be described as "around the corner". The rest of my suggestions I think you could take or leave as you see fit.

SethTisue · 2018-04-18T14:41:50Z

well, I guess I feel pretty strongly about the "lead with a "How different are Scala 2 and Scala 3?" section that emphasizes continuity" comment, too.

lrytz · 2018-04-18T14:58:37Z

blog/_posts/2018-04-18-scala-3.md

+
+The intent is to publish the final Scala 3.0 soon after Scala 2.14. At the
+current release schedule (which might still change), that means late
+2019 or early 2020.


If there are no delays, we'll have 2.13 mid 2018, which means 2.14 early 2020, so "late 2019" is ambitious for 3.0

actually I was wondering about that as well, I should have said something.

lrytz · 2018-04-18T15:02:19Z

blog/_posts/2018-04-18-scala-3.md

+Scala 3 is neither source nor binary compatible with Scala 2. However:
+
+
+ - Scala 3 code can link against Scala 2 artifacts (Scala 2.12 and upwards).


Yes, if this feature is mentioned, it needs to be explained; what does it do, how does it work, how is it useful? (I personlly don't understand what it is).

odersky · 2018-04-19T10:22:26Z

Thanks for all the comments! I think Almost all suggestions are incorporated in the latest version.

SethTisue · 2018-04-19T10:34:29Z

(CI failure is spurious (#875))

ashawley · 2018-04-19T12:18:46Z

blog/_posts/2018-04-19-scala-3.md

+_What is Scala 2.14 for?_
+
+Scala 2.14's main focus will be on smoothing the migration to Scala
+3. It will do this by defining migration tools, shim libraries, and


Markdown parsing in Jekyll is interpreting this as a bulleted list:

Viewing the Markdown file in Github does the right thing.

Although viewing the diff in Github is highlighting the "3." in red.

nice catch!

ashawley · 2018-04-19T12:33:58Z

blog/_posts/2018-04-19-scala-3.md

+_How can I help?_
+
+Scala 3 is developed completely in the open at
+[https://github.com/lampepfl/dotty]. Get involved there, by fixing and


In order to make a URL a link in Markdown you need to use:

[https://github.com/lampepfl/dotty](https://github.com/lampepfl/dotty)

ashawley · 2018-04-19T12:35:46Z

blog/_posts/2018-04-19-scala-3.md

+
+_When can I try it out?_
+
+You can start working with Dotty now. See the getting started


Maybe link [getting started](http://dotty.epfl.ch/docs/contributing/getting-started.html)?

odersky force-pushed the add-scala-3 branch from 2689506 to 2fd6d63 Compare April 10, 2018 20:20

Blog post on Scala 3

f180db9

odersky force-pushed the add-scala-3 branch from 2fd6d63 to f180db9 Compare April 10, 2018 20:23

odersky requested a review from adriaanm April 10, 2018 20:24

odersky added 2 commits April 10, 2018 22:31

Reformulate intro paragraph

e759d06

Fix typo

55c3037

ashawley reviewed Apr 11, 2018

View reviewed changes

odersky added 2 commits April 11, 2018 17:02

Fix layout

350d810

Put quotes around title

9fb9d73

odersky closed this Apr 11, 2018

SethTisue mentioned this pull request Apr 11, 2018

new blog posts always fail PR validation #875

Closed

odersky reopened this Apr 18, 2018

Fleshed out blog post

a72d636

odersky force-pushed the add-scala-3 branch from 728f4d5 to a72d636 Compare April 18, 2018 14:12

SethTisue reviewed Apr 18, 2018

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lrytz reviewed Apr 18, 2018

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SethTisue approved these changes Apr 19, 2018

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odersky added 2 commits April 19, 2018 14:01

Add links

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Mention feature freeze

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ashawley reviewed Apr 19, 2018

View reviewed changes

odersky added 2 commits April 19, 2018 14:57

Fix links and layout

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Add links to LSP and SBT

7e965ed

odersky merged commit c8fc261 into scala:master Apr 20, 2018


		_What about migration?_

		Scala 3 is neither source nor binary compatible with Scala 2. However:

		Scala 3 is neither source nor binary compatible with Scala 2. However:


		- Scala 3 code can link against Scala 2 artifacts (Scala 2.12 and upwards).


		_When can I try it out?_

		You can start working with Dotty now. See the getting started

Blog post on Scala 3 #872

Blog post on Scala 3 #872

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SethTisue commented Apr 18, 2018

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odersky commented Apr 18, 2018 •

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