Macros are not experimental

Author: liufengyun

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

@@ -26,6 +26,7 @@ object Feature:
   val dependent = experimental("dependent")
   val erasedDefinitions = experimental("erasedDefinitions")
   val symbolLiterals: TermName = deprecated("symbolLiterals")
+  val macros = experimental("macros")
 
   val experimentalWarningMessage = "Experimental features may only be used with nightly or snapshot version of compiler."
 
@@ -35,9 +36,9 @@ object Feature:
     Properties.experimental && !ctx.settings.YnoExperimental.value
 
   def isExperimental(feature: TermName): Boolean =
-    feature match
+    feature != macros && feature.match
     case QualifiedName(nme.experimental, _) => true
-    case _ => true
+    case _ => false
 
   /** Is `feature` enabled by by a command-line setting? The enabling setting is
    *

compiler/src/dotty/tools/dotc/core/StdNames.scala

@@ -520,6 +520,7 @@ object StdNames {
     val longHash: N             = "longHash"
     val macroThis : N           = "_this"
     val macroContext : N        = "c"
+    val macros: N               = "macros"
     val main: N                 = "main"
     val manifest: N             = "manifest"
     val ManifestFactory: N      = "ManifestFactory"

compiler/src/dotty/tools/dotc/parsing/Parsers.scala

@@ -3036,7 +3036,10 @@ object Parsers {
       val imp = Import(tree, selectors)
       if isLanguageImport(tree) then
         in.languageImportContext = in.languageImportContext.importContext(imp, NoSymbol)
-        if isExperimentalImport(tree) && !Feature.experimentalEnabled then
+        if isExperimentalImport(tree)
+           && !Feature.experimentalEnabled
+           && selectors.exists(_.name != nme.macros)
+        then
           report.error(Feature.experimentalWarningMessage, imp.srcPos)
         for
           case ImportSelector(id @ Ident(imported), EmptyTree, _) <- selectors