Require (...) around parameters of a lambda #7156
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
I.e.
```scala
{ x: Int => x + 1 }
```
is no longer legal, you have to write
```scala
{ (x: Int) => x + 1 }
```
Parentheses were already mandated by the syntax but the parser still allowed the old
syntax. Now, it does so only under -language:Scala2.
|
The title of this PR is concerning -- is that only for parameters with type ascriptions, or always? Specifically, are parens required around a single un-ascribed parameter? If so, I would say this is a step backwards ergonomically -- this is an enormously common pattern, and adding the extra ceremony is unfortunate... |
|
@jducoeur No, just parameters with type ascriptions. |
odersky
force-pushed
the
change-lambda-syntax
branch
from
8a1d7ba to
c5b9879
Compare
odersky
force-pushed
the
change-lambda-syntax
branch
from
c5b9879 to
b13116a
Compare
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
I.e.
{ x: Int => x + 1 }is no longer legal, you have to write
{ (x: Int) => x + 1 }Parentheses were already mandated by the syntax but the parser still allowed the old
syntax. Now, it does so only under -language:Scala2.