Fix #2973: Check variances of class parents #4057
Conversation
|
All failures (in
|
| @@ -132,14 +132,16 @@ class VarianceChecker()(implicit ctx: Context) { | |||
| ctx.debuglog(s"Skipping variance check of ${sym.showDcl}") | |||
| case tree: TypeDef => | |||
| checkVariance(sym, tree.pos) | |||
| tree.rhs match { | |||
| case rhs: Template => traverseChildren(rhs) | |||
There was a problem hiding this comment.
Here traverseChildren sees parents (in the form of a constructor call), but this Traverser ignores terms and only looks at definitions...
| //case tp: ClassInfo => | ||
| // ??? not clear what to do here yet. presumably, it's all checked at local typedefs | ||
| case tp: ClassInfo => | ||
| foldOver(status, tp.classParents) |
There was a problem hiding this comment.
This visit sees the parent classes, but stripped of any annotations!
| @@ -132,14 +132,16 @@ class VarianceChecker()(implicit ctx: Context) { | |||
| ctx.debuglog(s"Skipping variance check of ${sym.showDcl}") | |||
| case tree: TypeDef => | |||
| checkVariance(sym, tree.pos) | |||
There was a problem hiding this comment.
On tests/pos/Iterable.scala we get an error inside this call (going through tp.classParents), because sym contains the parens but without annotations!
|
Closing since this is likely noise — I've a first guess why Martin got stuck on it, and it's not an issue for a beginner like me yet. |
I'm opening this PR to recover this "lost" fix to a soundness issue (#2973, #3856). Let's see its status.