Add -Ycook-comments to cook comments

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

@@ -117,6 +117,7 @@ class ScalaSettings extends Settings.SettingGroup {
   val YtestPickler = BooleanSetting("-Ytest-pickler", "self-test for pickling functionality; should be used with -Ystop-after:pickler")
   val YcheckReentrant = BooleanSetting("-Ycheck-reentrant", "check that compiled program does not contain vars that can be accessed from a global root.")
   val YkeepComments = BooleanSetting("-Ykeep-comments", "Keep comments when scanning source files.")
+  val YcookComments = BooleanSetting("-Ycook-comments", "Cook the comments (type check `@usecase`, etc.)")
   val YforceSbtPhases = BooleanSetting("-Yforce-sbt-phases", "Run the phases used by sbt for incremental compilation (ExtractDependencies and ExtractAPI) even if the compiler is ran outside of sbt, for debugging.")
   val YdumpSbtInc = BooleanSetting("-Ydump-sbt-inc", "For every compiled foo.scala, output the API representation and dependencies used for sbt incremental compilation in foo.inc, implies -Yforce-sbt-phases.")
   val YcheckAllPatmat = BooleanSetting("-Ycheck-all-patmat", "Check exhaustivity and redundancy of all pattern matching (used for testing the algorithm)")

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

@@ -1527,8 +1527,10 @@ class Typer extends Namer
       if (!ctx.isAfterTyper)
         cls.setNoInitsFlags((NoInitsInterface /: body1) ((fs, stat) => fs & defKind(stat)))
 
-      // Expand comments and type usecases
-      cookComments(body1.map(_.symbol), self1.symbol)(ctx.localContext(cdef, cls).setNewScope)
+      // Expand comments and type usecases if `-Ycook-comments` is set.
+      if (ctx.settings.YcookComments.value) {
+        cookComments(body1.map(_.symbol), self1.symbol)(ctx.localContext(cdef, cls).setNewScope)
+      }
 
       checkNoDoubleDeclaration(cls)
       val impl1 = cpy.Template(impl)(constr1, parents1, self1, body1)

doc-tool/src/dotty/tools/dottydoc/DocDriver.scala

@@ -23,6 +23,7 @@ class DocDriver extends Driver {
 
     ctx.setSettings(summary.sstate)
     ctx.setSetting(ctx.settings.YkeepComments, true)
+    ctx.setSetting(ctx.settings.YcookComments, true)
     ctx.setSetting(ctx.settings.YnoInline, true)
     ctx.setProperty(ContextDoc, new ContextDottydoc)
 

doc-tool/test/DottyDocTest.scala

@@ -24,6 +24,7 @@ trait DottyDocTest extends MessageRendering {
     val ctx = base.initialCtx.fresh
     ctx.setSetting(ctx.settings.language, List("Scala2"))
     ctx.setSetting(ctx.settings.YkeepComments, true)
+    ctx.setSetting(ctx.settings.YcookComments, true)
     ctx.setSetting(ctx.settings.YnoInline, true)
     ctx.setSetting(ctx.settings.wikiSyntax, true)
     ctx.setProperty(ContextDoc, new ContextDottydoc)