Backport "Fail early & more clearly on shaded-broken classfiles" to L…

…TS (#22083) Backports #21262 to the 3.3.5. PR submitted by the release tooling. [skip ci]
scala · Dec 3, 2024 · 653abda · 653abda
2 parents 33ad399 + 9d9664f
commit 653abda
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/compiler/src/dotty/tools/dotc/core/classfile/ClassfileParser.scala b/compiler/src/dotty/tools/dotc/core/classfile/ClassfileParser.scala
@@ -1039,7 +1039,10 @@ class ClassfileParser(
         // attribute isn't, this classfile is a compilation artifact.
         return Some(NoEmbedded)
 
-      if (scan(tpnme.ScalaSignatureATTR) && scan(tpnme.RuntimeVisibleAnnotationATTR)) {
+      if (scan(tpnme.ScalaSignatureATTR)) {
+        if !scan(tpnme.RuntimeVisibleAnnotationATTR) then
+          report.error(em"No RuntimeVisibleAnnotations in classfile with ScalaSignature attribute: ${classRoot.fullName}")
+          return None
         val attrLen = in.nextInt
         val nAnnots = in.nextChar
         var i = 0