Make inline non final

This change is to support macro overrides

Author: nicolasstucki

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

@@ -592,8 +592,8 @@ object Flags {
   /** Assumed to be pure */
   final val StableOrErased: FlagSet = StableRealizable | Erased
 
-  /** Labeled `private`, `final`, or `inline` */
-  final val EffectivelyFinal: FlagSet = Private | Final | Inline
+  /** Labeled `private`, or `final` */
+  final val EffectivelyFinal: FlagSet = Private | Final
 
   /** A private method */
   final val PrivateMethod: FlagConjunction = allOf(Private, Method)

tests/neg-macros/quote-MacroOverride.scala

@@ -6,8 +6,8 @@ object Test {
   }
 
   object B extends A {
-    inline def f() = ${'{}}  // error: may not override
-    override def g() = ()    // error: may not override
+    override inline def f() = () // error: method f of type (): Unit is an inline method, must override at least one concrete method
+    override def g() = ()
   }
 
 }

tests/run/quote-MacroOverride.scala

@@ -0,0 +1,27 @@
+object Test {
+
+  abstract class A {
+    inline def f1(): String = "A.f1"
+    inline def f2(): String = "A.f2"
+    def f3(): String = "A.f3"
+  }
+
+  object B extends A {
+    override def f1(): String = "B.f1"
+    override inline def f2(): String = "B.f2"
+    override inline def f3(): String = "B.f3"
+  }
+
+  def main(args: Array[String]): Unit = {
+    val a: A = B
+    assert(a.f1() == "A.f1")
+    assert(a.f2() == "A.f2")
+    assert(a.f3() == "A.f3")
+
+    val b: B.type = B
+    assert(b.f1() == "B.f1")
+    assert(b.f2() == "B.f2")
+    assert(b.f3() == "B.f3")
+  }
+
+}