Merge pull request #11752 from dotty-staging/fix-indent-colon

Update -Yindent-colons functionality

Author: odersky

community-build/community-projects/intent

@@ -25,7 +25,8 @@ object Feature:
 
   val dependent = experimental("dependent")
   val erasedDefinitions = experimental("erasedDefinitions")
-  val symbolLiterals: TermName = deprecated("symbolLiterals")
+  val symbolLiterals = deprecated("symbolLiterals")
+  val fewerBraces = experimental("fewerBraces")
 
 /** Is `feature` enabled by by a command-line setting? The enabling setting is
    *

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

@@ -121,7 +121,7 @@ class ScalaSettings extends Settings.SettingGroup with CommonScalaSettings {
   val oldSyntax: Setting[Boolean] = BooleanSetting("-old-syntax", "Require `(...)` around conditions.")
   val indent: Setting[Boolean] = BooleanSetting("-indent", "Together with -rewrite, remove {...} syntax when possible due to significant indentation.")
   val noindent: Setting[Boolean] = BooleanSetting("-no-indent", "Require classical {...} syntax, indentation is not significant.", aliases = List("-noindent"))
-  val YindentColons: Setting[Boolean] = BooleanSetting("-Yindent-colons", "Allow colons at ends-of-lines to start indentation blocks.")
+  val YindentColons: Setting[Boolean] = BooleanSetting("-Yindent-colons", "(disabled: use -language:experimental.fewerBraces instead)")
 
   /** Decompiler settings */
   val printTasty: Setting[Boolean] = BooleanSetting("-print-tasty", "Prints the raw tasty.", aliases = List("--print-tasty"))