diff options
Diffstat (limited to 'compiler/src/dotty/tools/dotc/typer')
| -rw-r--r-- | compiler/src/dotty/tools/dotc/typer/Checking.scala | 5 | ||||
| -rw-r--r-- | compiler/src/dotty/tools/dotc/typer/RefChecks.scala | 2 |
2 files changed, 7 insertions, 0 deletions
diff --git a/compiler/src/dotty/tools/dotc/typer/Checking.scala b/compiler/src/dotty/tools/dotc/typer/Checking.scala index 41d9f9572..321c275d7 100644 --- a/compiler/src/dotty/tools/dotc/typer/Checking.scala +++ b/compiler/src/dotty/tools/dotc/typer/Checking.scala @@ -338,6 +338,11 @@ object Checking { checkNoConflict(Final, Sealed) checkNoConflict(Private, Protected) checkNoConflict(Abstract, Override) + if (sym.isType && !sym.is(Deferred)) + for (cls <- sym.allOverriddenSymbols.filter(_.isClass)) { + fail(i"$sym cannot have the same name as ${cls.showLocated} -- class definitions cannot be overridden") + sym.setFlag(Private) // break the overriding relationship by making sym Private + } } /** Check the type signature of the symbol `M` defined by `tree` does not refer diff --git a/compiler/src/dotty/tools/dotc/typer/RefChecks.scala b/compiler/src/dotty/tools/dotc/typer/RefChecks.scala index 3192546cd..e113399c5 100644 --- a/compiler/src/dotty/tools/dotc/typer/RefChecks.scala +++ b/compiler/src/dotty/tools/dotc/typer/RefChecks.scala @@ -289,6 +289,8 @@ object RefChecks { if (!isOverrideAccessOK) { overrideAccessError() } else if (other.isClass) { + // direct overrides were already checked on completion (see Checking.chckWellFormed) + // the test here catches indirect overriddes between two inherited base types. overrideError("cannot be used here - class definitions cannot be overridden") } else if (!other.is(Deferred) && member.isClass) { overrideError("cannot be used here - classes can only override abstract types") |