Restore removed comment

Author: tanishiking

compiler/src/dotty/tools/dotc/Compiler.scala

@@ -39,7 +39,7 @@ class Compiler {
     List(new CheckShadowing) :: // Check shadowing elements
     List(new YCheckPositions) ::    // YCheck positions
     List(new sbt.ExtractDependencies) :: // Sends information on classes' dependencies to sbt via callbacks
-    List(new semanticdb.ExtractSemanticDB.ExtractSemanticInfo) :: // Extract info and attach to the tree of the unit file
+    List(new semanticdb.ExtractSemanticDB.ExtractSemanticInfo) :: // Extract info into .semanticdb files
     List(new PostTyper) ::          // Additional checks and cleanups after type checking
     List(new sjs.PrepJSInterop) ::  // Additional checks and transformations for Scala.js (Scala.js only)
     List(new sbt.ExtractAPI) ::     // Sends a representation of the API of classes to sbt via callbacks
@@ -72,7 +72,7 @@ class Compiler {
          new ExpandSAMs,             // Expand single abstract method closures to anonymous classes
          new ElimRepeated,           // Rewrite vararg parameters and arguments
          new RefChecks) ::           // Various checks mostly related to abstract members and overriding
-    List(new semanticdb.ExtractSemanticDB.AppendDiagnostics) :: // Attach warnings to extracted SemanticDB and write to .semanticdb file
+    // List(new semanticdb.ExtractSemanticDB.AppendDiagnostics) :: // Attach warnings to extracted SemanticDB and write to .semanticdb file
     List(new init.Checker) ::        // Check initialization of objects
     List(new ProtectedAccessors,     // Add accessors for protected members
          new ExtensionMethods,       // Expand methods of value classes with extension methods

compiler/test/dotty/tools/dotc/semanticdb/SemanticdbTests.scala

@@ -71,6 +71,7 @@ class SemanticdbTests:
     def collectErrorOrUpdate(expectPath: Path, obtained: String) =
       if updateExpectFiles then
         Files.write(expectPath, obtained.getBytes(StandardCharsets.UTF_8))
+        println("updated: " + expectPath)
       else
         val expected = new String(Files.readAllBytes(expectPath), StandardCharsets.UTF_8)
         val expectName = expectPath.getFileName