Do not ignore anonymous ValDefs if they are givens

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

@@ -169,6 +169,7 @@ class ExtractSemanticDB extends Phase:
             tree match
               case tree: DefDef =>
                 tree.paramss.foreach(_.foreach(param => registerSymbolSimple(param.symbol)))
+              case tree: ValDef if tree.symbol.is(Given) => traverse(tree.tpt)
               case _ =>
             if !tree.symbol.isGlobal then
               localBodies(tree.symbol) = tree.rhs

tests/semanticdb/expect/AnonymousGiven.expect.scala

@@ -0,0 +1,5 @@
+package angiven
+
+trait Foo/*<-angiven::Foo#*/
+
+/*<-angiven::AnonymousGiven$package.*/def bar/*<-angiven::AnonymousGiven$package.bar().*/(using Foo/*->angiven::Foo#*/) = 42

tests/semanticdb/expect/AnonymousGiven.scala

@@ -0,0 +1,5 @@
+package angiven
+
+trait Foo
+
+def bar(using Foo) = 42

tests/semanticdb/metac.expect

@@ -329,6 +329,32 @@ Occurrences:
 [18:6..18:9): foo <- example/Anonymous#foo.
 [18:16..18:19): Foo -> example/Anonymous#Foo#
 
+expect/AnonymousGiven.scala
+---------------------------
+
+Summary:
+Schema => SemanticDB v4
+Uri => AnonymousGiven.scala
+Text => empty
+Language => Scala
+Symbols => 5 entries
+Occurrences => 6 entries
+
+Symbols:
+angiven/AnonymousGiven$package. => final package object angiven
+angiven/AnonymousGiven$package.bar(). => method bar
+angiven/AnonymousGiven$package.bar().(x$1) => implicit param x$1
+angiven/Foo# => trait Foo
+angiven/Foo#`<init>`(). => primary ctor <init>
+
+Occurrences:
+[0:8..0:15): angiven <- angiven/
+[2:0..2:0): <- angiven/Foo#`<init>`().
+[2:6..2:9): Foo <- angiven/Foo#
+[4:0..4:0): <- angiven/AnonymousGiven$package.
+[4:4..4:7): bar <- angiven/AnonymousGiven$package.bar().
+[4:14..4:17): Foo -> angiven/Foo#
+
 expect/Classes.scala
 --------------------