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WojciechMazurWojciechMazur
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Merge pull request #15655 from dotty-staging/fix-implicit-loop-check
Fix looping implicits check
2 parents 8fc154e + 8aa8cfe commit 7e20b81

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+45
-134
lines changed

4 files changed

+45
-134
lines changed

‎compiler/src/dotty/tools/dotc/transform/CheckLoopingImplicits.scala

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -98,7 +98,7 @@ class CheckLoopingImplicits extends MiniPhase:
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checkNotLooping(finalizer)
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case SeqLiteral(elems, _) =>
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elems.foreach(checkNotLooping)
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case t: ValDef =>
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case t: ValDef if !t.symbol.is(Lazy) =>
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checkNotLooping(t.rhs)
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case _ =>
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‎tests/neg-custom-args/fatal-warnings/i13542.scala

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -40,7 +40,7 @@ val x5 =
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val x6 =
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implicit def barToFoo4(bar: Bar): Foo =
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lazy val y = bar.toFoo // error
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lazy val y = bar.toFoo
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if false then y else ???
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val foo: Foo = Bar(1)
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‎tests/neg/i13044.check

Lines changed: 0 additions & 132 deletions
Original file line numberDiff line numberDiff line change
@@ -1,135 +1,3 @@
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-- Warning: tests/neg/i13044.scala:50:40 -------------------------------------------------------------------------------
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50 | implicit def typeSchema: Schema[A] = Schema.gen // error // error
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| ^^^^^^^^^^
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|Infinite loop in function body
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|{
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| val SchemaDerivation_this: Schema.type = Schema
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| {
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| val SchemaDerivation_this: (SchemaDerivation_this : Schema.type) = SchemaDerivation_this
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| {
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| val $scrutinee1:
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| scala.deriving.Mirror.Product{
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| MirroredMonoType = A; MirroredType = A; MirroredLabel = ("A" : String); MirroredElemTypes = (A, B);
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| MirroredElemLabels = (("a" : String), ("b" : String))
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| }
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| =
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| A.$asInstanceOf[
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| scala.deriving.Mirror.Product{
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| MirroredMonoType = A; MirroredType = A; MirroredLabel = ("A" : String); MirroredElemTypes = (A, B);
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| MirroredElemLabels = (("a" : String), ("b" : String))
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| }
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| ]
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| val m:
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| scala.deriving.Mirror.Product{
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| MirroredMonoType = A; MirroredType = A; MirroredLabel = ("A" : String); MirroredElemTypes = (A, B);
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| MirroredElemLabels = (("a" : String), ("b" : String))
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| }
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| = $scrutinee1
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| lazy val fields: List[Schema[Any]] =
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| {
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| val SchemaDerivation_this: (SchemaDerivation_this : (SchemaDerivation_this : Schema.type)) =
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| SchemaDerivation_this
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| {
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| val builder: Schema[Any] = TestApp.typeSchema.asInstanceOf[Schema[Any]]
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| {
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| val SchemaDerivation_this:
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| (SchemaDerivation_this : (SchemaDerivation_this : (SchemaDerivation_this : Schema.type)))
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| = SchemaDerivation_this
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| (
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| {
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| val builder: Schema[Any] =
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| {
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| val SchemaDerivation_this: Schema.type = Schema
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| (
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| {
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| val SchemaDerivation_this: (SchemaDerivation_this : Schema.type) = SchemaDerivation_this
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| {
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| val $scrutinee4:
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| scala.deriving.Mirror.Product{
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| MirroredMonoType = B; MirroredType = B; MirroredLabel = ("B" : String);
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| MirroredElemTypes = C *: EmptyTuple.type
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| ; MirroredElemLabels = ("c" : String) *: EmptyTuple.type
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| }
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| =
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| B.$asInstanceOf[
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| scala.deriving.Mirror.Product{
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| MirroredMonoType = B; MirroredType = B; MirroredLabel = ("B" : String);
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| MirroredElemTypes = C *: EmptyTuple.type
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| ; MirroredElemLabels = ("c" : String) *: EmptyTuple.type
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| }
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| ]
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| val m:
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| scala.deriving.Mirror.Product{
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| MirroredMonoType = B; MirroredType = B; MirroredLabel = ("B" : String);
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| MirroredElemTypes = C *: EmptyTuple.type
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| ; MirroredElemLabels = ("c" : String) *: EmptyTuple.type
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| }
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| = $scrutinee4
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| lazy val fields: List[Schema[Any]] =
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| {
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| val SchemaDerivation_this:
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| (SchemaDerivation_this : (SchemaDerivation_this : Schema.type))
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| = SchemaDerivation_this
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| {
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| val builder: Schema[Any] =
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| {
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| val SchemaDerivation_this: Schema.type = Schema
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| (
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| {
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| val SchemaDerivation_this: (...SchemaDerivation_this : ....type) =
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| SchemaDerivation_this
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| {
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| val $scrutinee6:
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| ...{
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| MirroredMonoType...; MirroredType...; MirroredLabel...;
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| MirroredElemTypes...
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| ; MirroredElemLabels...
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| }
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| = ....$asInstanceOf[...]
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| val m: ... = ...$scrutinee6
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| lazy val fields: ... =
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| {
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| val SchemaDerivation_this: ... = ...
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| ...:...
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| }
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| {
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| final class $anon() extends ...(), ... {
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| def build: ... = ...
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| }
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| ...():...
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| }
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| }:...[...]
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| }
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| :Schema[C])
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| }.asInstanceOf[Schema[Any]]
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| SchemaDerivation_this.recurse[EmptyTuple.type].::[Schema[Any]](builder)
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| }:List[Schema[Any]]
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| }
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| {
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| final class $anon() extends Object(), Schema[B] {
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| def build: B = ???
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| }
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| new Object with Schema[B] {...}():Schema[B]
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| }
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| }:Schema[B]
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| }
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| :Schema[B])
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| }.asInstanceOf[Schema[Any]]
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| SchemaDerivation_this.recurse[EmptyTuple.type].::[Schema[Any]](builder)
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| }
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| :List[Schema[Any]])
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| }.::[Schema[Any]](builder)
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| }:List[Schema[Any]]
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| }
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| {
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| final class $anon() extends Object(), Schema[A] {
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| def build: A = ???
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| }
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| new Object with Schema[A] {...}():Schema[A]
129-
| }
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| }:Schema[A]
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| }:Schema[A]
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|}
1331
-- Error: tests/neg/i13044.scala:50:40 ---------------------------------------------------------------------------------
1342
50 | implicit def typeSchema: Schema[A] = Schema.gen // error // error
1353
| ^^^^^^^^^^

‎tests/pos-special/fatal-warnings/not-looping-implicit.scala

Lines changed: 43 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,43 @@
1+
import scala.deriving.Mirror
2+
import scala.compiletime._
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trait Schema[T]
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6+
object Schema {
7+
implicit val stringSchema: Schema[String] = new Schema[String] {}
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implicit def listSchema[A](implicit ev: Schema[A]): Schema[List[A]] = new Schema[List[A]] {}
9+
implicit def mapSchema[A, B](implicit evA: Schema[A], evB: Schema[B]): Schema[Map[A, B]] =
10+
new Schema[Map[A, B]] {}
11+
12+
inline def recurse[Label, A <: Tuple](index: Int = 0): List[(String, Schema[Any], Int)] =
13+
inline erasedValue[(Label, A)] match {
14+
case (_: (name *: names), _: (t *: ts)) =>
15+
val label = constValue[name].toString
16+
val builder = summonInline[Schema[t]].asInstanceOf[Schema[Any]]
17+
(label, builder, index) :: recurse[names, ts](index + 1)
18+
case (_: EmptyTuple, _) => Nil
19+
}
20+
21+
inline def derived[A]: Schema[A] =
22+
inline summonInline[Mirror.Of[A]] match {
23+
case m: Mirror.SumOf[A] =>
24+
lazy val members = recurse[m.MirroredElemLabels, m.MirroredElemTypes]()
25+
new Schema[A] {}
26+
case m: Mirror.ProductOf[A] =>
27+
lazy val fields = recurse[m.MirroredElemLabels, m.MirroredElemTypes]()
28+
new Schema[A] {}
29+
}
30+
31+
inline given gen[A]: Schema[A] = derived[A]
32+
}
33+
34+
sealed trait InputValue
35+
object InputValue {
36+
case class ListValue(values: List[InputValue]) extends InputValue
37+
case class ObjectValue(fields: Map[String, InputValue]) extends InputValue
38+
case class VariableValue(name: String) extends InputValue
39+
}
40+
41+
@main def Test =
42+
implicit lazy val inputValueSchema: Schema[InputValue] = Schema.gen
43+
println(summon[Schema[InputValue]])

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