Always enable fewerBraces

This is intended as a test to see what breaks if we made
fewerBraces the standard syntax.

Author: odersky

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

@@ -209,7 +209,7 @@ object Scanners {
     def featureEnabled(name: TermName) = Feature.enabled(name)(using languageImportContext)
     def erasedEnabled = featureEnabled(Feature.erasedDefinitions)
 
-    private inline val fewerBracesByDefault = false
+    private inline val fewerBracesByDefault = true
       // turn on to study impact on codebase if `fewerBraces` was the default
 
     private var fewerBracesEnabledCache = false

compiler/test/dotty/tools/repl/ReplCompilerTests.scala

@@ -356,6 +356,7 @@ class ReplCompilerTests extends ReplTest:
              |""".stripMargin)
       assertEquals("val x: Int = 8", storedOutput().trim)
     }
+    /*
     initially {
       run("""|import language.experimental.fewerBraces
              |import language.experimental.fewerBraces as _
@@ -366,7 +367,7 @@ class ReplCompilerTests extends ReplTest:
              |""".stripMargin)
       assert("expected error if fewerBraces is unimported",
         lines().exists(_.contains("missing arguments for method apply")))
-    }
+    }*/
 
 object ReplCompilerTests:
 

tests/neg/fun-ascription.check

@@ -1,9 +1,12 @@
--- Error: tests/neg/fun-ascription.scala:2:17 --------------------------------------------------------------------------
+-- [E081] Type Error: tests/neg/fun-ascription.scala:2:13 --------------------------------------------------------------
 2 |val x1 = (f: Int => Int)  // error
-  |             ^^^^^^^^^^
-  |             function type in type ascription must be enclosed in parentheses
--- Error: tests/neg/fun-ascription.scala:3:16 --------------------------------------------------------------------------
+  |             ^^^
+  |             Missing parameter type
+  |
+  |             I could not infer the type of the parameter Int.
+-- [E081] Type Error: tests/neg/fun-ascription.scala:3:12 --------------------------------------------------------------
 3 |val x2 = f: Int => Int    // error
-  |                ^
-  |                parentheses are required around the parameter of a lambda
-  |                This construct can be rewritten automatically under -rewrite -source 3.0-migration.
+  |            ^^^
+  |            Missing parameter type
+  |
+  |            I could not infer the type of the parameter Int.

tests/neg/i4373b.scala

@@ -1,5 +1,5 @@
 // ==> 05bef7805687ba94da37177f7568e3ba7da1f91c.scala <==
 class x0 {
-  x1:
-      x0 | _  // error
+  x1:  // error
+      x0 | _
 // error