Exclude implicit class conversions in SemanticDB

Conversions generated for implicit classes were synthetic before,
now they need to be excluded separately.

compiler/src/dotty/tools/dotc/semanticdb/ExtractSemanticDB.scala

@@ -79,6 +79,7 @@ class ExtractSemanticDB extends Phase:
       || sym.isLocalDummy
       || sym.is(Synthetic)
       || sym.isSetter
+      || sym.isOldStyleImplicitConversion(forImplicitClassOnly = true)
       || excludeDefOrUse(sym)
 
     private def excludeDefOrUse(sym: Symbol)(using Context): Boolean =
@@ -102,6 +103,7 @@ class ExtractSemanticDB extends Phase:
     private def excludeChildren(sym: Symbol)(using Context): Boolean =
       !sym.exists
       || sym.is(Param) && sym.info.bounds.hi.isInstanceOf[Types.HKTypeLambda]
+      || sym.isOldStyleImplicitConversion(forImplicitClassOnly = true)
 
     /** Uses of this symbol where the reference has given span should be excluded from semanticdb */
     private def excludeUse(qualifier: Option[Symbol], sym: Symbol)(using Context): Boolean =

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

@@ -87,6 +87,19 @@ object SymUtils:
 
     def isGenericProduct(using Context): Boolean = whyNotGenericProduct.isEmpty
 
+    /** Is this the an old style implicit conversion?
+     *  @param directOnly            only consider explicitly written methods
+     *  @param forImplicitClassOnly  only consider methods generated from implicit classes
+     */
+    def isOldStyleImplicitConversion(directOnly: Boolean = false, forImplicitClassOnly: Boolean = false)(using Context): Boolean =
+      self.is(Implicit) && self.info.stripPoly.match
+        case mt @ MethodType(_ :: Nil) if !mt.isImplicitMethod =>
+          if self.isCoDefinedGiven(mt.finalResultType.typeSymbol)
+          then !directOnly
+          else !forImplicitClassOnly
+        case _ =>
+          false
+
     def useCompanionAsMirror(using Context): Boolean = self.linkedClass.exists && !self.is(Scala2x)
 
     /** Is this a sealed class or trait for which a sum mirror is generated?

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

@@ -861,23 +861,14 @@ trait Checking {
   /** If `sym` is an old-style implicit conversion, check that implicit conversions are enabled.
    *  @pre  sym.is(GivenOrImplicit)
    */
-  def checkImplicitConversionDefOK(sym: Symbol)(using Context): Unit = {
-    def check(): Unit =
+  def checkImplicitConversionDefOK(sym: Symbol)(using Context): Unit =
+    if sym.isOldStyleImplicitConversion(directOnly = true) then
       checkFeature(
         nme.implicitConversions,
         i"Definition of implicit conversion $sym",
         ctx.owner.topLevelClass,
         sym.srcPos)
 
-    sym.info.stripPoly match {
-      case mt @ MethodType(_ :: Nil)
-      if !mt.isImplicitMethod && !sym.isCoDefinedGiven(mt.finalResultType.typeSymbol) =>
-        // it's an old-style conversion
-        check()
-      case _ =>
-    }
-  }
-
   /** If `tree` is an application of a new-style implicit conversion (using the apply
    *  method of a `scala.Conversion` instance), check that implicit conversions are
    *  enabled.

tests/semanticdb/expect/InventedNames.expect.scala

@@ -25,7 +25,7 @@ given X/*->givens::X#*/ with
 given (using X/*->givens::X#*/): Y/*->givens::Y#*/ with
   def doY/*<-givens::InventedNames$package.given_Y#doY().*/ = "7"
 
-given [T/*<-givens::InventedNames$package.given_Z_T#[T]*/]: Z/*->givens::Z#*/[T/*->givens::InventedNames$package.given_Z_T#[T]*/] with
+given [T/*<-givens::InventedNames$package.given_Z_T#[T]*//*<-givens::InventedNames$package.given_Z_T().[T]*/]: Z/*->givens::Z#*/[T/*->givens::InventedNames$package.given_Z_T#[T]*/] with
   def doZ/*<-givens::InventedNames$package.given_Z_T#doZ().*/: List/*->scala::package.List#*/[T/*->givens::InventedNames$package.given_Z_T#[T]*/] = Nil/*->scala::package.Nil.*/
 
 

tests/semanticdb/metac.expect

@@ -484,7 +484,7 @@ classes/C12#foo2Impl().(context) => param context: Context
 classes/C12#foo2Impl().(x) => param x: context.Expr[Int]
 classes/C12#foo2Impl().(y) => param y: context.Expr[String]
 classes/M. => final object M extends Object { self: M.type => +3 decls }
-classes/M.C5# => class C5 extends Object { self: C5 => +2 decls }
+classes/M.C5# => implicit class C5 extends Object { self: C5 => +2 decls }
 classes/M.C5#`<init>`(). => primary ctor <init> (param x: Int): C5
 classes/M.C5#`<init>`().(x) => param x: Int
 classes/M.C5#x. => private[this] val method x Int
@@ -1519,7 +1519,7 @@ example/ImplicitConversion#string2Number().(string) => param string: String
 example/ImplicitConversion#tuple. => val method tuple Tuple2[Int, Int]
 example/ImplicitConversion#x. => val method x Int
 example/ImplicitConversion. => final object ImplicitConversion extends Object { self: ImplicitConversion.type => +6 decls }
-example/ImplicitConversion.newAny2stringadd# => final class newAny2stringadd [typeparam A ] extends AnyVal { self: newAny2stringadd[A] => +4 decls }
+example/ImplicitConversion.newAny2stringadd# => final implicit class newAny2stringadd [typeparam A ] extends AnyVal { self: newAny2stringadd[A] => +4 decls }
 example/ImplicitConversion.newAny2stringadd#[A] => typeparam A 
 example/ImplicitConversion.newAny2stringadd#`+`(). => method + (param other: String): String
 example/ImplicitConversion.newAny2stringadd#`+`().(other) => param other: String
@@ -1684,7 +1684,7 @@ Uri => InventedNames.scala
 Text => empty
 Language => Scala
 Symbols => 45 entries
-Occurrences => 61 entries
+Occurrences => 62 entries
 
 Symbols:
 givens/InventedNames$package. => final package object givens extends Object { self: givens.type => +24 decls }
@@ -1705,14 +1705,14 @@ givens/InventedNames$package.given_List_T().[T] => typeparam T
 givens/InventedNames$package.given_String. => final implicit lazy val given method given_String String
 givens/InventedNames$package.given_X. => final implicit given object given_X extends Object with X { self: given_X.type => +2 decls }
 givens/InventedNames$package.given_X.doX(). => method doX => Int <: givens/X#doX().
-givens/InventedNames$package.given_Y# => class given_Y extends Object with Y { self: given_Y => +3 decls }
+givens/InventedNames$package.given_Y# => implicit given class given_Y extends Object with Y { self: given_Y => +3 decls }
 givens/InventedNames$package.given_Y#`<init>`(). => primary ctor <init> ()(implicit val given param x$1: X): given_Y
 givens/InventedNames$package.given_Y#`<init>`().(x$1) => implicit val given param x$1: X
 givens/InventedNames$package.given_Y#doY(). => method doY => String <: givens/Y#doY().
 givens/InventedNames$package.given_Y#x$1. => protected implicit val given method x$1 X
 givens/InventedNames$package.given_Y(). => final implicit given method given_Y (implicit given param x$1: X): given_Y
 givens/InventedNames$package.given_Y().(x$1) => implicit given param x$1: X
-givens/InventedNames$package.given_Z_T# => class given_Z_T [typeparam T ] extends Object with Z[T] { self: given_Z_T[T] => +3 decls }
+givens/InventedNames$package.given_Z_T# => implicit given class given_Z_T [typeparam T ] extends Object with Z[T] { self: given_Z_T[T] => +3 decls }
 givens/InventedNames$package.given_Z_T#[T] => typeparam T 
 givens/InventedNames$package.given_Z_T#`<init>`(). => primary ctor <init> [typeparam T ](): given_Z_T[T]
 givens/InventedNames$package.given_Z_T#doZ(). => method doZ => List[T] <: givens/Z#doZ().
@@ -1767,6 +1767,7 @@ Occurrences:
 [24:17..24:18): Y -> givens/Y#
 [25:6..25:9): doY <- givens/InventedNames$package.given_Y#doY().
 [27:7..27:8): T <- givens/InventedNames$package.given_Z_T#[T]
+[27:7..27:8): T <- givens/InventedNames$package.given_Z_T().[T]
 [27:11..27:12): Z -> givens/Z#
 [27:13..27:14): T -> givens/InventedNames$package.given_Z_T#[T]
 [28:6..28:9): doZ <- givens/InventedNames$package.given_Z_T#doZ().