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Make NamedTupls an experimental feature again
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+150
-91
lines changed

compiler/src/dotty/tools/dotc/config/Feature.scala

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@@ -34,6 +34,7 @@ object Feature:
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val pureFunctions = experimental("pureFunctions")
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val captureChecking = experimental("captureChecking")
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val into = experimental("into")
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val namedTuples = experimental("namedTuples")
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val modularity = experimental("modularity")
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val betterMatchTypeExtractors = experimental("betterMatchTypeExtractors")
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val quotedPatternsWithPolymorphicFunctions = experimental("quotedPatternsWithPolymorphicFunctions")
@@ -65,6 +66,7 @@ object Feature:
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(pureFunctions, "Enable pure functions for capture checking"),
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(captureChecking, "Enable experimental capture checking"),
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(into, "Allow into modifier on parameter types"),
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(namedTuples, "Allow named tuples"),
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(modularity, "Enable experimental modularity features"),
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(betterMatchTypeExtractors, "Enable better match type extractors"),
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(betterFors, "Enable improvements in `for` comprehensions")

compiler/src/dotty/tools/dotc/parsing/Parsers.scala

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@@ -667,7 +667,7 @@ object Parsers {
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else leading :: Nil
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def maybeNamed(op: () => Tree): () => Tree = () =>
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if isIdent && in.lookahead.token == EQUALS && sourceVersion.isAtLeast(`3.6`) then
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if isIdent && in.lookahead.token == EQUALS && in.featureEnabled(Feature.namedTuples) then
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atSpan(in.offset):
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val name = ident()
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in.nextToken()
@@ -2172,7 +2172,7 @@ object Parsers {
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if namedOK && isIdent && in.lookahead.token == EQUALS then
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commaSeparated(() => namedArgType())
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else if tupleOK && isIdent && in.lookahead.isColon && sourceVersion.isAtLeast(`3.6`) then
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else if tupleOK && isIdent && in.lookahead.isColon && in.featureEnabled(Feature.namedTuples) then
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commaSeparated(() => namedElem())
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else
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commaSeparated(() => argType())

compiler/src/dotty/tools/dotc/typer/Typer.scala

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@@ -795,7 +795,7 @@ class Typer(@constructorOnly nestingLevel: Int = 0) extends Namer
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def tryNamedTupleSelection() =
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val namedTupleElems = qual.tpe.widenDealias.namedTupleElementTypes
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val nameIdx = namedTupleElems.indexWhere(_._1 == selName)
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if nameIdx >= 0 && sourceVersion.isAtLeast(`3.6`) then
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if nameIdx >= 0 && Feature.enabled(Feature.namedTuples) then
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typed(
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untpd.Apply(
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untpd.Select(untpd.TypedSplice(qual), nme.apply),

docs/_docs/reference/other-new-features/named-tuples.md renamed to docs/_docs/reference/experimental/named-tuples.md

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@@ -1,10 +1,10 @@
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---
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layout: doc-page
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title: "Named Tuples"
4-
nightlyOf: https://docs.scala-lang.org/scala3/reference/other-new-features/named-tuples.html
4+
nightlyOf: https://docs.scala-lang.org/scala3/reference/experimental/named-tuples.html
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---
66

7-
Starting in Scala 3.6, the elements of a tuple can be named. Example:
7+
The elements of a tuple can now be named. Example:
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```scala
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type Person = (name: String, age: Int)
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val Bob: Person = (name = "Bob", age = 33)

docs/sidebar.yml

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@@ -72,7 +72,6 @@ subsection:
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- page: reference/other-new-features/export.md
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- page: reference/other-new-features/opaques.md
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- page: reference/other-new-features/opaques-details.md
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- page: reference/other-new-features/named-tuples.md
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- page: reference/other-new-features/open-classes.md
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- page: reference/other-new-features/parameter-untupling.md
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- page: reference/other-new-features/parameter-untupling-spec.md
@@ -159,6 +158,7 @@ subsection:
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- page: reference/experimental/cc.md
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- page: reference/experimental/purefuns.md
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- page: reference/experimental/tupled-function.md
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- page: reference/experimental/named-tuples.md
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- page: reference/experimental/modularity.md
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- page: reference/experimental/typeclasses.md
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- page: reference/experimental/runtimeChecked.md

library/src/scala/NamedTuple.scala

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@@ -1,6 +1,8 @@
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package scala
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import annotation.experimental
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import compiletime.ops.boolean.*
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@experimental
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object NamedTuple:
57

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/** The type to which named tuples get mapped to. For instance,
@@ -131,6 +133,7 @@ object NamedTuple:
131133
end NamedTuple
132134

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/** Separate from NamedTuple object so that we can match on the opaque type NamedTuple. */
136+
@experimental
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object NamedTupleDecomposition:
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import NamedTuple.*
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extension [N <: Tuple, V <: Tuple](x: NamedTuple[N, V])

library/src/scala/runtime/stdLibPatches/language.scala

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@@ -97,7 +97,6 @@ object language:
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* @see [[https://dotty.epfl.ch/docs/reference/experimental/named-tuples]]
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*/
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@compileTimeOnly("`namedTuples` can only be used at compile time in import statements")
100-
@deprecated("The experimental.namedTuples language import is no longer needed since the feature is now standard", since = "3.6")
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object namedTuples
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/** Experimental support for new features for better modularity, including

presentation-compiler/test/dotty/tools/pc/tests/completion/CompletionSuite.scala

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@@ -1988,7 +1988,8 @@ class CompletionSuite extends BaseCompletionSuite:
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19891989
@Test def `namedTuple completions` =
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check(
1991-
"""|import scala.NamedTuple.*
1991+
"""|import scala.language.experimental.namedTuples
1992+
|import scala.NamedTuple.*
19921993
|
19931994
|val person = (name = "Jamie", city = "Lausanne")
19941995
|
@@ -1999,7 +2000,8 @@ class CompletionSuite extends BaseCompletionSuite:
19992000

20002001
@Test def `Selectable with namedTuple Fields member` =
20012002
check(
2002-
"""|import scala.NamedTuple.*
2003+
"""|import scala.language.experimental.namedTuples
2004+
|import scala.NamedTuple.*
20032005
|
20042006
|class NamedTupleSelectable extends Selectable {
20052007
| type Fields <: AnyNamedTuple

tests/neg/i20517.check

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Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
1-
-- [E007] Type Mismatch Error: tests/neg/i20517.scala:9:43 -------------------------------------------------------------
2-
9 | def dep(foo: Foo[Any]): From[foo.type] = (elem = "") // error
3-
| ^^^^^^^^^^^
4-
| Found: (elem : String)
5-
| Required: NamedTuple.From[(foo : Foo[Any])]
6-
|
7-
| longer explanation available when compiling with `-explain`
1+
-- [E007] Type Mismatch Error: tests/neg/i20517.scala:10:43 ------------------------------------------------------------
2+
10 | def dep(foo: Foo[Any]): From[foo.type] = (elem = "") // error
3+
| ^^^^^^^^^^^
4+
| Found: (elem : String)
5+
| Required: NamedTuple.From[(foo : Foo[Any])]
6+
|
7+
| longer explanation available when compiling with `-explain`

tests/neg/i20517.scala

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Original file line numberDiff line numberDiff line change
@@ -1,3 +1,4 @@
1+
import scala.language.experimental.namedTuples
12
import NamedTuple.From
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34
case class Foo[+T](elem: T)

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