From 3a3688f64af0755cef5a772d322ac80e08498e54 Mon Sep 17 00:00:00 2001 From: Lukas Rytz Date: Fri, 15 Jul 2016 11:32:38 +0200 Subject: SD-128 fix override checks for default methods The check for inheriting two conflicting members was wrong for default methods, leading to a missing error message. We were also not issuing "needs `override' modifier" when overriding a default method. Removes two methods: - `isDeferredOrJavaDefault` had a single use that is removed in this commit. - `isDeferredNotJavaDefault` is redundant with `isDeferred`, because no default method has the `DEFERRED` flag: - For symbols originating in the classfile parser this was the case from day one: default methods don't receive the `DEFERRED` flag. Only abstract interface methods do, as they have the `JAVA_ACC_ABSTRACT` flag in bytecode, which the classfile parser translates to `DEFERRED`. - For symbols created by the Java source parser, we don't add the `DEFERRED` to default methods anymore since 373db1e. Fixes scala/scala-dev#128 --- src/compiler/scala/tools/nsc/typechecker/RefChecks.scala | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'src/compiler') diff --git a/src/compiler/scala/tools/nsc/typechecker/RefChecks.scala b/src/compiler/scala/tools/nsc/typechecker/RefChecks.scala index 72133f31fa..8449260fe6 100644 --- a/src/compiler/scala/tools/nsc/typechecker/RefChecks.scala +++ b/src/compiler/scala/tools/nsc/typechecker/RefChecks.scala @@ -419,7 +419,7 @@ abstract class RefChecks extends Transform { overrideError("cannot be used here - classes can only override abstract types") } else if (other.isEffectivelyFinal) { // (1.2) overrideError("cannot override final member") - } else if (!other.isDeferredOrJavaDefault && !other.hasFlag(JAVA_DEFAULTMETHOD) && !member.isAnyOverride && !member.isSynthetic) { // (*) + } else if (!other.isDeferred && !member.isAnyOverride && !member.isSynthetic) { // (*) // (*) Synthetic exclusion for (at least) default getters, fixes SI-5178. We cannot assign the OVERRIDE flag to // the default getter: one default getter might sometimes override, sometimes not. Example in comment on ticket. if (isNeitherInClass && !(other.owner isSubClass member.owner)) @@ -606,7 +606,7 @@ abstract class RefChecks extends Transform { def checkNoAbstractMembers(): Unit = { // Avoid spurious duplicates: first gather any missing members. def memberList = clazz.info.nonPrivateMembersAdmitting(VBRIDGE) - val (missing, rest) = memberList partition (m => m.isDeferredNotJavaDefault && !ignoreDeferred(m)) + val (missing, rest) = memberList partition (m => m.isDeferred && !ignoreDeferred(m)) // Group missing members by the name of the underlying symbol, // to consolidate getters and setters. val grouped = missing groupBy (sym => analyzer.underlyingSymbol(sym).name) -- cgit v1.2.3