Check for open flag on objects

Fixes scala#21760
dotty-staging · Nov 29, 2024 · 33f58dd · 33f58dd
1 parent 9f97997
commit 33f58dd
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diff --git a/compiler/src/dotty/tools/dotc/typer/Checking.scala b/compiler/src/dotty/tools/dotc/typer/Checking.scala
@@ -611,6 +611,8 @@ object Checking {
     val mods = mdef.mods
     def flagSourcePos(flag: FlagSet) =
       mods.mods.find(_.flags == flag).getOrElse(mdef).srcPos
+    if mods.is(Open) then
+      report.error(ModifierNotAllowedForDefinition(Open), flagSourcePos(Open))
     if mods.is(Abstract) then
       report.error(ModifierNotAllowedForDefinition(Abstract), flagSourcePos(Abstract))
     if mods.is(Sealed) then

diff --git a/tests/neg/i21760.scala b/tests/neg/i21760.scala
@@ -0,0 +1 @@
+open object O // error