docs: @Nonnull
      public BugInstance addSourceLine(ClassContext classContext, MethodGen methodGen, String sourceFile,
              @Nonnull InstructionHandle handle) {
          SourceLineAnnotation sourceLineAnnotation = SourceLineAnnotation.fromVisitedInstruction(classContext, methodGen,
                  sourceFile, handle);
          if (sourceLineAnnotation != null) {
              add(sourceLineAnnotation);
          }
          return this;
      }