SI-8315 Fix crash in dead code elimination

It was a cache invalidation bug.

We need to mark the Code as touched to invalidate the caches
behind `predecessors` and `successors`.

4 files changed, 25 insertions, 0 deletions

diff --git a/test/files/pos/t8315.flags b/test/files/pos/t8315.flags
new file mode 100644
index 0000000000..c926ad6493
--- /dev/null
+++ b/test/files/pos/t8315.flags
@@ -0,0 +1 @@
+-Yinline -Ydead-code
diff --git a/test/files/pos/t8315.scala b/test/files/pos/t8315.scala
new file mode 100644
index 0000000000..2f7742ed67
--- /dev/null
+++ b/test/files/pos/t8315.scala
@@ -0,0 +1,12 @@
+object Test {
+  def crash(as: Listt): Unit = {
+    map(as, (_: Any) => return)
+  }
+ 
+  final def map(x: Listt, f: Any => Any): Any = {
+    if (x eq Nill) "" else f("")
+  }
+}
+ 
+object Nill extends Listt
+class Listt
diff --git a/test/files/pos/t8315b.flags b/test/files/pos/t8315b.flags
new file mode 100644
index 0000000000..c926ad6493
--- /dev/null
+++ b/test/files/pos/t8315b.flags
@@ -0,0 +1 @@
+-Yinline -Ydead-code
diff --git a/test/files/pos/t8315b.scala b/test/files/pos/t8315b.scala
new file mode 100644
index 0000000000..d7a2bf565f
--- /dev/null
+++ b/test/files/pos/t8315b.scala
@@ -0,0 +1,11 @@
+object Test extends Object {
+  def crash: Unit = {
+    val key = ""
+    try map(new F(key))
+    catch { case _: Throwable => }
+  };
+  final def map(f: F): Any = f.apply("");
+};
+final class F(key: String) {
+  final def apply(a: Any): Any = throw new RuntimeException(key);
+}