Method calls get a line number

compiler/src/dotty/tools/backend/jvm/BCodeBodyBuilder.scala

@@ -866,6 +866,7 @@ trait BCodeBodyBuilder extends BCodeSkelBuilder {
                   defn.ObjectClass
                 } else qualSym
               }
+              lineNumber(app)
               generatedType = genCallMethod(sym, invokeStyle, app.span, receiverClass)
             }
           }

tests/run/apply-line.scala

@@ -0,0 +1,26 @@
+
+object Test:
+
+  def void(): Unit = ???
+  def self(): this.type = this
+
+  def test(): Unit =
+    this // is line 8
+      .self()
+      .void()
+
+  @annotation.nowarn
+  def main(args: Array[String]): Unit =
+    try test()
+    catch (t: Throwable) =>
+      t.getStackTrace.iterator
+        .filter(_.getFileName == "apply-line.scala")
+        .filter(_.getMethodName == "test")
+        .foreach(sf => assert(sf.getLineNumber == 10))
+
+/* was
+Test$.void(apply-line.scala:4)
+Test$.test(apply-line.scala:8)
+Test$.main(apply-line.scala:14)
+Test.main(apply-line.scala)
+*/