Exclude methods of scala.compiletime from coverage instrumentation

Author: TheElectronWill

compiler/src/dotty/tools/dotc/transform/InstrumentCoverage.scala

@@ -344,7 +344,11 @@ class InstrumentCoverage extends MacroTransform with IdentityDenotTransformer:
       */
     private def isCompilerIntrinsicMethod(sym: Symbol)(using Context): Boolean =
       val owner = sym.maybeOwner
-      owner.eq(defn.AnyClass) || owner.isPrimitiveValueClass
+      owner.exists && (
+        owner.eq(defn.AnyClass) ||
+        owner.isPrimitiveValueClass ||
+        owner.maybeOwner == defn.CompiletimePackageClass
+      )
 
 object InstrumentCoverage:
   val name: String = "instrumentCoverage"

tests/coverage/pos/CompiletimeUninitialized.scala

@@ -0,0 +1,5 @@
+package covtest
+
+import scala.compiletime.uninitialized
+class Foo:
+  var x: AnyRef = uninitialized

tests/coverage/pos/CompiletimeUninitialized.scoverage.check

@@ -0,0 +1,20 @@
+# Coverage data, format version: 3.0
+# Statement data:
+# - id
+# - source path
+# - package name
+# - class name
+# - class type (Class, Object or Trait)
+# - full class name
+# - method name
+# - start offset
+# - end offset
+# - line number
+# - symbol name
+# - tree name
+# - is branch
+# - invocations count
+# - is ignored
+# - description (can be multi-line)
+# '' sign
+# ------------------------------------------